Chemistry is the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms, their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds. Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds.In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level.Chemistry was preceded by its protoscience, alchemy, which is an intuitive but non-scientific approach to understanding the constituents of matter and their interactions. Just follow the Mcqs online quiz being dispatched over here with respect to your preparation for entry admission test NTS PPSC OTS PTS and missllenous job exams simultaneously.
Here we have large collection of Chemistry Mcqs for all Students and jobs test preparation purpose. These Chemistry Mcqs will be updated on daily basis and added more multiple choice question about Chemistry frequently.You can prepare your Chemistry Subject for different classes like 9th class, 10th class ,11th class 12th class exams, Entry Test like MCAT NTS ,OTS ,PTS ,BTS, GTS, Jobs Test,Recruitment Test like PPSC CSS FPSC SPSC KPPSC and interviews here.
Chemistry Mcqs Online With Answers for NTS PPSC Entry Test Classes
A compound contains 50% sulphur and 50% oxygen by mass. The empirical formula of the compound is?
A. S2O3
B. SO3
C. SO2
D. SO
Right Answer: C. SO2
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All II-A group elements react with halogens to form halides of the type?
A. Ionic
B. Polymeric
C. Covalent
D. Amphoteric
Right Answer: A. Ionic
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Which of the following step is not involved in NH4NO3 manufacturing?
A. Prilling
B. Neutralization of HNO3 with NH3
C. Evaporation
D. Dehydration
Right Answer: D. Dehydration
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Cellulose has structure like?
A. Amylose
B. Amylopectin
C. Linear chain
D. Glucose
Right Answer: C. Linear chain
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Molal boiling point constant is the ratio of the elevation in the boiling to?
A. Molarity
B. Mole fraction of solvent
C. Molality
D. Mole fraction of the solute
Right Answer: C. Molality
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The correct set of four quantum numbers for the valence electron of rubidium (Z = 37) is?
A. n = 5, 1 = 0, m = 0 and s = +1/2
B. n = 5, 1 = 1, m = 1 and s = +1/2
C. n = 5, 1 = 1, m = 0 and s = +1/2
D. n = 6, 1 = 0, m = 0 and s = +1/2
Right Answer: A. n = 5, 1 = 0, m = 0 and s = +1/2
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Which ester is used as orange flavor?
A. Amylacetate
B. Benzylacetate
C. Acetyl chloride
D. Carboxylic acid
Right Answer: C. Acetyl chloride
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Which of the following statements is not correct?
A. Double bond is stronger than the single bond
B. σ bond is stronger than π bond
C. Triple bond is shorter than double bond
D. σ bond is weaker than π bond
Right Answer: D. σ bond is weaker than π bond
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The following molecules has linear structure except?
A. CS2
B. SO2
C. CO2
D. BeCl2
Right Answer: B. SO2
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Arrhenius equation can be used for evaluating?
A. Specific rate constant
B. Both of the above
C. Activation energy
D. Half life period
Right Answer: C. Activation energy
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Which of the following 0.1 m solution will have the lowest freezing point?
A. K2SO4
B.
C.
D.
Right Answer: A. K2SO4
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Total number of hybrid orbitals of all carbon atoms in benzene are?
A. 3
B. 12
C. 6
D. 18
Right Answer: D. 18
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If ionic product is equal to Ksp then the solution is?
A. Unsaturated
B. Ideal
C. Supersaturated
D. Saturated
Right Answer: D. Saturated
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Electrochemical series is useful in?
A. Prediction of the feasibility of a chemical reaction
B. Calculation of voltage
C. Comparison of the relative tendencies of the metals and non-metals to get oxidized or reduced
D. All of the above
Right Answer: D. All of the above
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Which statement is correct about DNA?
A. These help in protein synthesis
B. Hydrogen bonding is absent in DNA
C. These help in genetic transmission
D. Ribose sugar is present in DNA
Right Answer: C. These help in genetic transmission
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Gold and silver are least reactive due to?
A. Positive oxidation potential
B. Zero oxidation potential
C. Positive reduction potential
D. Having large negative electrode potential
Right Answer: C. Positive reduction potential
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End to end overlapping of orbitals give rise to the formation of?
A. Sigma bond
B. Metallic bond
C. Pi bond
D. Co-ordinate covalent bond
Right Answer: A. Sigma bond
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Fats and oils are the example of?
A. Simple lipids
B. Associated lipids
C. Compound lipids
D. Derived lipids
Right Answer: A. Simple lipids
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Alanine is an amino acid but its nature is?
A. Acidic
B. Neutral
C. Basic
D. All of these
Right Answer: B. Neutral
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Total number of valance electrons of nitrogen atom in a ammonium ion is?
A. 6
B. 10
C. 8
D. 16
Right Answer: C. 8
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Carboxylic acid react with ammonia to form which salt?
A. Acid amide
B. Ammonium acetate
C. Acetic anhydride
D. Acetyl chloride
Right Answer: B. Ammonium acetate
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Which of the following property of IIA group decreases down to the group?
A. Atomic radii
B. Reactivity of H2O
C. Basicity of hydroxides
D. Ionization energy
Right Answer: D. Ionization energy
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An element having high ionization energy and tends to be chemically in-active would most likely to be a/an?
A. Alkali metal
B. Noble gas
C. Transition element
D. Halogen
Right Answer: B. Noble gas
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Reduction of ketone using NaBH4 gives?
A. Primary alcohol
B. Tertiary alcohol
C. Secondary alcohol
D. Phenol
Right Answer: C. Secondary alcohol
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Which one is not dicarboxylic acid?
A. Phthalic acid
B. Adipic acid
C. Benzoic acid
D. Oxalic acid
Right Answer: C. Benzoic acid
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Total heat content of a system is called?
A. Internal energy
B. Enthalpy
C. Entropy
D. All of these
Right Answer: B. Enthalpy
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Which pair of electrons of elements will have the same chemical properties?
A. 2, 24
B. 2, 4
C. 13, 22
D. 3, 11
Right Answer: D. 3, 11
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Which one of the following is the same for SiO2 and CO2?
A. Si – O bond distance and C – O bond distance
B. Empirical formula
C. Dipole moments
D. Bond angles
Right Answer: B. Empirical formula
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In contact process SO3 manufacturing is favour at low temperature but in actual practice the reaction is carried out at 400-600°C the reason is that?
A. At high temperature reaction will be fast
B. Rate of forward reaction is low
C. Equilibrium will established later
D. Separation is easy at high temperature
Right Answer: B. Rate of forward reaction is low
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The amino group in amino acids can be attached by to any carbon other than?
A. Alpha carbon
B. Gamma carbon
C. Beta carbon
D. Carbonyl carbon
Right Answer: D. Carbonyl carbon
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Oleum is prepared by?
A. Absorbing SO3 into water
B. Absorbing SO3 into sulfuric acid
C. Absorbing SO2 into water
D. Absorbing SO2 into sulfuric acid
Right Answer: B. Absorbing SO3 into sulfuric acid
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The largest number of moles are present in?
A. 2.8g CO
B. 3.6g H2O
C. 4.8g C2H5OH
D. 5.4g N2O5
Right Answer: B. 3.6g H2O
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What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated?
A. 2
B. 12
C. 0
D. 2.7
Right Answer: B. 12
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Which one tells amount of the free fatty acid?
A. Sponification number
B. Acid number
C. Iodine number
D. Number of double bonds
Right Answer: B. Acid number
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Which type of reactions are more abundant in organic reaction?
A. Substitution reaction
B. Free Radical reaction
C. Addition reaction
D. Elimination reaction
Right Answer: B. Free Radical reaction
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When the solvent is containing non volatile solute particles, then?
A. Vapor pressure is decreased
B. Vapor pressure doesn’t change
C. Vapor pressure is elevated
D. Volume is decrease
Right Answer: A. Vapor pressure is decreased
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The unit of rate constant is the same as that of the rate of reaction in?
A. 1st order reaction
B. Zero order reaction
C. 2nd order reaction
D. 3rd order reaction
Right Answer: B. Zero order reaction
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Which statement is incorrect about formation of ester?
A. When carboxylic acids are heated with alcohols esters are formed
B. Esters have fruity smell
C. Esters are used as artificial flavors
D. Ester are formed in the presence of NaOH
Right Answer: D. Ester are formed in the presence of NaOH
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Which of the following cell can convert chemical energy directly into electrical energy?
A. Mercury Cell
B. Lead storage battery
C. Daniel Cell
D. Fuel Cell
Right Answer: D. Fuel Cell
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Major sources of NOx pollutants are?
A. Natural gas
B. Combustion of coal and oil
C. Gasoline
D. All of these
Right Answer: D. All of these
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0
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Which of the following compounds has non directional bond?
A. BF3
B. KBr
C. Mg CO3
D. NF3
Right Answer: B. KBr
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Hydrolysis of amides gives the corresponding?
A. Carboxylic acid
B. Alkane
C. Alcohol
D. Amino acid
Right Answer: A. Carboxylic acid
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Which is example of pentose?
A. Glucose
B. Glyceraldehyde
C. Ribose
D. All of these
Right Answer: C. Ribose
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Which of the following is used as a catalyst for esterification?
A. Dil. H2SO4
B. Dilute alkali
C. Conc. H2SO4
D. Conc. alkali
Right Answer: A. Dil. H2SO4
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Lack of essential amino acids in diet leads to the disease.
A. Kwashiorkar
B. Sickle cell anaemia
C. Night blindness
D. Pernicious anaemia
Right Answer: A. Kwashiorkar
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Baeyer’s reagent is?
A. 1% alkaline KMnO4
B. (R)3Al and TiCl4
C. 1% acidified potassium dichromate
D. Liquid ammonia
Right Answer: A. 1% alkaline KMnO4
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Buffer solutions are used in except?
A. Clinical analysis
B. Nutrition
C. Soil science
D. Qualitative analysis
Right Answer: D. Qualitative analysis
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When two amino acids are condensed releasing a water molecule, HN – C=O linkage thus formed is called?
A. α helix linkage
B. Peptide linkage
C. Glycosidic linkage
D. All of the above
Right Answer: B. Peptide linkage
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Which one of the following species is not an electrophile?
A. NH3
B. H+
C. Br+
D. BF3
Right Answer: A. NH3
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Acetyl chloride is soluble in which solvent?
A. H2O
B. Acetone
C. Ether
D. Both b and c
Right Answer: D. Both b and c
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1
0
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Haloform test is given by?
A. Acetadehyde
B. Propanone
C. Methyl group ketones
D. All of these
Right Answer: C. Methyl group ketones
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Which one metal shows maximum oxidation state?
A. Mn
B. Ag
C. Cr
D. Hg
Right Answer: A. Mn
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When we mix SO3 with conc. H2SO4 in contact process, the product obtained is?
A. Sulphuric acid
B. Pyrosulphuric acid
C. HNO3
D. Carbonic acid
Right Answer: B. Pyrosulphuric acid
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The work of concentrated H2SO4 in esterification process is as?
A. Dehydrating agent and catalyst
B. Dydrating agent
C. Hydrolyzing agent
D. Catalyst
Right Answer: D. Catalyst
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What is the % of nitrogen in urea (NH2CONH2)?
A. 82.35%
B. 35%
C. 46.6%
D. 55.56%
Right Answer: C. 46.6%
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The substances which don’t dissolve in reasonable amount in particular solvent are?
A. Miscible
B. Well soluble
C. Sparingly soluble
D.Insoluble
Right Answer: C. Sparingly soluble
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Carbohydrate containing aldehyde is called?
A. Aldose
B. Ketone
C. Fructose
D. Starch
Right Answer: A. Aldose
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Which one among the following is not a good leaving group?
A. HSO4
B. OH–
C. Cl–
D. Br–
Right Answer: B. OH–
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For d2sp3 hybridization, the expected shape is?
A. Tetrahedral
B. Square planar
C. Trigonal bipyramidal
D. Octahedral
Right Answer: D. Octahedral
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Thioalcohol is prepared when alkyl halide is reacted with?
A. OH–
B. SH–
C. NO–2
D. I–
Right Answer: C. NO–2
Total 1 Votes:
1
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Which of the following group of periodic table possess the elements of all the three physical states of matter?
A. IV A
B. VA
C. VII A
D. VIII A
Right Answer: C. VII A
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What is the shapes of p orbitals?
A. Circular
B. Dumb-bell
C. Elliptical
D. Complex
Right Answer: B. Dumb-bell
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Which of the following contains 1 mole of the stated particle?
A. Chlorine molecules in 35.5 g of chlorine gas
B. Electrons in 1g of hydrogen gas
C. Hydrogen ions in 1dm3 of 1 mol dm-3 aqueous sulphuric acid
D. Oxygen atoms in 22.4 dm3 of oxygen gas at STP
Right Answer: B. Electrons in 1g of hydrogen gas
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2
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The quality of raw water is improved by?
A. Reduction
B. Dehydration
C. Aeration
D. Incineration
Right Answer: C. Aeration
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Which of the following can be used for alcohol denaturing?
A. Methanol
B. Pyridine
C. Acetone
D. All of these
Right Answer: D. All of these
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What is the Colour of K2Cr2O7 ?
A. Red
B. Green
C. Orange
D. Yellow
Right Answer: C. Orange
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The electronic configuration of an element is 1s2 2s2 2p3. This represent a/an?
A. Ground State
B. Hybridized state
C. Excited state
D. Molecular state
Right Answer: A. Ground State
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A solution has 92g ethanol, 96g methanol and 90g water. Mole fraction of water in the solution is?
A. 0.1
B. 0.4
C. 0.2
D. 0.5
Right Answer: D. 0.5
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. In Contact process for the manufacture of sulfuric acid, the most important reaction occurs in the catalyst chamber. Which set of the reactants and the catalyst are correct?
A. Sulfur, air and Pt
B. Sulfur, Oxygen and V2O5
C. Sulfur dioxide, air and V2O5
D. Sulfur dioxide air and steam
Right Answer: C. Sulfur dioxide, air and V2O5
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One mole of SO2 contains?
A. 6.002 x 1023 atoms of Oxygen
B. 6.002 x 1023 atoms of Sulphur
C. 18.1 x 1023 molecules of SO2
D. 4 g atoms of SO2
Right Answer: B. 6.002 x 1023 atoms of Sulphur
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Ozone layer of stratosphere requires protection from indiscriminate use of?
A. Aerosols and high flying jets
B. Pesticides
C. Balloons
D. Atomic explosions
Right Answer: A. Aerosols and high flying jets
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Primary alcohols upon oxidation with acidified dichromate gives?
A. Aldehydes
B. Branched alkenes
C. Ketones
D. All of these
Right Answer: A. Aldehydes
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NHCommunities are _________ collection of organism.
A. Static
B. Dynamic
C. Biosphere
D. Random
Right Answer: B. Dynamic
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Elimination bimolecular reactions involve?
A. 1st order kinetics
B. Zero order kinetics
C. 2nd order kinetics
D. None of these
Right Answer: C. 2nd order kinetics
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In a double bond connecting 2 atoms there is a sharing of?
A. 1 electron
B. 2 electrons
C. 3 electrons
D. two electron pairs
Right Answer: D. two electron pairs
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Here the strongest acid is?
A. CH3COOH
B. CH3CH2COOH
C. Cl-CH2-COOH
D. Br-CH2-COOH
Right Answer: C. Cl-CH2-COOH
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1
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For which one of the following pairs of compounds can the members be distinguished by means of Tollen’s tests.
A. HCHO and CH3CHO
B. CH3CHO and CH3COCH3
C. CH3COCH and CH3COCH2CH3
D. CH3COOH and CH3COCH3
Right Answer: B. CH3CHO and CH3COCH3
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Nitric acid is prepared commercially by?
A. Brikeland and Eyde’s process
B. Contact process
C. Wurtz-Fitting synthesis
D. Haber’s process
Right Answer: A. Brikeland and Eyde’s process
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Which one of the following doesn’t react quickly with water at room temperature?
A. K
B. Mg
C. Li
D. Na
Right Answer: A. K
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Which statement is incorrect about reactivity of alkyl halides?
A. Greater the bond energy of R-X, lesser the reactivity
B. Greater the bond polarity of R-X, lesser the reactivity
C. Greater the bond energy of R-X, smaller the stability
D. Greater E.N difference of R-X, greater the stability
Right Answer: C. Greater the bond energy of R-X, smaller the stability
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“Al” metal is extracted from its ________ during electrolysis.
A. Chlorides
B. Cryolite
C. Oxides
D. All of these
Right Answer: C. Oxides
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Which of the following test is used to identify amino acids?
A. Silver mirror test
B. Ninhydrin test
C. Iodoform test
D. Allof these
Right Answer: B. Ninhydrin test
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There are _________ oxides of carbon are known.
A. Two
B. Three
C. Four
D. Five
Right Answer: B. Three
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Which of the following is not primary pollutant?
A. SO3
B. CO
C. NO
D. H2SO4
Right Answer: D. H2SO4
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During an exothermic or endothermic reaction which one of the following formula is used to calculate the amount of heat evolved or absorbed
A. ∆H = ∆E + PV
B. ∆p = ∆H
C. ∆E = q + w
D. q = m x s x ∆T
Right Answer: D. q = m x s x ∆T
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Which one alcohols is aromatic?
A. Glycerol
B. Ethane-1, 2 diol
C. 2-Phenylethanol
D. None of these
Right Answer: C. 2-Phenylethanol
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Inorganic compound of nitrogen are not commonly found as minerals because?
A. Nitrogen is an inert element
B. It is present in air as major constituent
C. Its minerals are unstable
D. None of the above
Right Answer: A. Nitrogen is an inert element
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The best and the most recommended technology for solid waste management is?
A. Dumping into land fills
B. Recycling
C. Incineration
D. Treatment before incineration
Right Answer: B. Recycling
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When 0.5 moles of Al2(SO4)3 are dissolved in water, total number of particles produced?
A. 1.2 x 1023
B. 3.0 x 1023
C. 1.5 x 1024
D. 2.5 x 1023
Right Answer: C. 1.5 x 1024
Total 15 Votes:
2
13
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Which one is chemical method for the determination of rate of reaction?
A. Spectometry
B. Refractrometric method
C. Dilatometric method
D. Titration
Right Answer: D. Titration
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Which one of the following doesn’t react with water even at red hot temperature?
A. Be
B. Ca
C. Mg
D. Ba
Right Answer: A. Be
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/Which one among the following is good leaving group?
A. OH–
B. Cl–
C. F–
D. I–
Right Answer: D. I–
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The technique which is not used to separate isotopes?
A. Thermal diffusion
B. Ultra centrifuge
C. Distillation
D. Extraction
Right Answer: D. Extraction
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250cm3 of 0.2 molar potassium sulphate solution is mixed with 250cm3 of 0.2 molar KCl solution. The molar concentration of K+ ions is?
A. 0.2 molar
B. 0.3 molar
C. 0.25 molar
D. 0.35 molar
Right Answer: B. 0.3 molar
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In esterification reaction, which one of the following bonds of alcohol undergo cleavage?
A. C – H
B. O – H
C. C – O
D. C – C
Right Answer: B. O – H
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When the concentration of reactant in the reaction is increased by 8 times, the rate increased only by 2 times. what is the order of reaction?
A. 1
B. ½
C. 1/3
D. 2
Right Answer: C. 1/3
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Which substance does not oxidize easily?
A. CH3CH2CHO
B. CH3CHO
C. HCHO
D. CH3COCH3
Right Answer: D. CH3COCH3
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Which of the following transition used as a catalyst in Haber’s process?
A. Fe
B. Cr2O3
C. Al2O3
D. All of these
Right Answer: A. Fe
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Isotopes are?
A. Chemically similar
B. Physically dissimilar
C. Chemically dissimilar
D. Both a and b
Right Answer: D. Both a and b
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The ability of elements to act as reducing agent _________ down to electrochemical series.
A. Increase
B. Remain constant
C. Decreases
D. Depends upon the reaction conditions
Right Answer: C. Decreases
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