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.
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Chemistry Mcqs Online With Answers for NTS PPSC Entry Test Classes
Chemistry
Chemistry Mcqs with Answers solved online.
Picric acid can be prepared from phenol by?
A. Halogenation
B. Oxidation
C. Nitration
D. Sulphonation
Right Answer: C. Nitration
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Two enzymes that are distinct chemically and physically but catalyze same reaction are called?
A. Transferees
B. Hydrolases
C. Co-enzymes
D. Iso-enzymes
Right Answer: D. Iso-enzymes
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Isotopes differ in?
A. Properties with respect to their mass number
B. Properties with respect to their proton number
C. Isotopes don’t differ as they have same number of electrons and protons
D. All of the above
Right Answer: A. Properties with respect to their mass number
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Which salts make the water hard?
A. Calcium
B. Aluminum
C. Magnesium
D. Both a and c
Right Answer: D. Both a and c
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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 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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. In laboratory the decomposition of hydrogen peroxide is carried out best by using _____ catalyst.
A. Mn
B. Finally powdered MnO2
C. Chromium
D. All of these
Right Answer: B. Finally powdered MnO2
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Which of the following hydroxide is more soluble in water?
A. LiOH
B. Mg(OH)2
C. Sr(OH)2
D. Ba(OH)2
Right Answer: D. Ba(OH)2
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Combustion analysis is performed for the determination of?
A. Molar mass of the compound
B. Structural formula of the substance
C. Empirical formula of the compound
D. Mass of halogens present in organic compound
Right Answer: C. Empirical formula of the compound
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If ethanoic acid is to be prepared by hydrolysis of alkyl nitriles, which of the following can be the reagent to be hydrolyzed?
A. CH3CN
B. HCN
C. CH3CH2CN
D. None of these
Right Answer: A. CH3CN
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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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When alcohols react with Na metal, the alkoxide ion thus formed is a strong?
A. Electrophile
B. Acid
C. Nucleophile
D. None of these
Right Answer: C. Nucleophile
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1 gram molecule refers to
A. Amount in grams equivalent to 1 mole of an atom
B. Amount in grams equivalent to 1 mole of a molecule
C. Amount in grams equivalent to 1 mole of a molecule or a compound
D. Amount in grams of an ionic compound
Right Answer: B. Amount in grams equivalent to 1 mole of a molecule
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In the oxidation of unsymmetrical ketone using strong oxidizing agents like conc. HNO3, which carbon atom is preferentially attacked?
A. Carbon atom with the maximum number of hydrogen atoms
B. Carbon atoms with the least number of hydrogen atoms
C. Alpha carbon
D. Beta carbon
Right Answer: A. Carbon atom with the maximum number of hydrogen atoms
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Oxidation of SO2(g) in the presence of NO(g) catalyst is an example of?
A. Homogeneous catalysis
B. Auto catalysis
C. Heterogeneous catalysis
D. Negative catalysis
Right Answer: A. Homogeneous catalysis
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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 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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A smuggler was caught by Airport police and 24 g of diamond was recovered from him. How many atoms of carbon he was carrying?
A. 6 x 1023
B. 1.8 x 1024
C. 1.2 x 1024
D. 2.4 x 1024
Right Answer: C. 1.2 x 1024
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That solution which possess maximum concentration of solute at given temperature is known as?
A. Unsaturated
B. Saturated
C. Super saturated
D. Dilute solution
Right Answer: B. Saturated
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The height of the peak in mass spectrum shows?
A. Number of isotopes
B. Mass Number
C. Relative abundance
D. Number of protons
Right Answer: C. Relative abundance
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Which one of the following is alicyclic hydrocarbon?
A. Benzene
B. Isobutylene
C. Cyclohexane
D. Neopentane
Right Answer: C. Cyclohexane
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Which one is the oxidation state of Mn?
A. +2 and +3
B. +4 and +5
C. +6 and +7
D. All of these
Right Answer: D. All of these
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When HCl gas is passed through saturated solution of rock salt, the solubility of NaCl?
A. Increases
B. May increases or decreases
C. Decreases
D. None of these
Right Answer: C. Decreases
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Total number of d-block elements are?
A. 37
B. 35
C. 40
D. All of these
Right Answer: C. 40
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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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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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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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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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In a mass spectrometer, increasing the magnetic field strength with constant electric field result in?
A. Increased ‘r’
B. Increased ionization
C. No effect
D. decreased ionization
Right Answer: C. No effect
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The extent of halogenations of alkanes depnds upon the factors?
A. Intensity of UV light
B. Temperature
C. Concentration of X2 used
D. Both a and b
Right Answer: C. Concentration of X2 used
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The ability of transition elements to form complexes is due to?
A. Small size of metal ion
B. Availability of empty d and f orbitals
C. Highly charged metal ion
D. All of these
Right Answer: B. Availability of empty d and f orbitals
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The study of elevation of boiling point is called?
A. Ebullioscopy
B. Cryoscopy
C. Osmometery
D. None of these
Right Answer: A. Ebullioscopy
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The compounds which are optically active are called?
A. Carbon with four difference groups
B. Chiral
C. Mirror image of one another
D. All of these
Right Answer: D. All of these
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Which of the following will not form enolate ion?
A. CH3COCH3
B. CH3CwHO
C. HCHO
D. All of these
Right Answer: C. HCHO
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The temperature at which nitrogen oxidized to NO during HNO3 production is?
A. 1000°C
B. 1500°C
C. 2000°C
D. 3000°C
Right Answer: D. 3000°C
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Phenol on treatment with dil. HNO3 at low temperature give?
A. o-Nitrophenol
B. p-Nitrophenol
C. m-Nitrophenol
D. Mixture of o-Nitrophenol and p-Nitrophenol
Right Answer: D. Mixture of o-Nitrophenol and p-Nitrophenol
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What is the colour of the [Ti(H2O)6]3+?
A. Red
B. Orange
C. Pink
D. Violet
Right Answer: D. Violet
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Which one is the most important use of nitric acid?
A. Manufacturing of fertilizers
B. Manufacture of explosives
C. Nylon manufacture
D. All of the above
Right Answer: D. All of the above
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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 is not primary pollutant?
A. SO3
B. CO
C. NO
D. H2SO4
Right Answer: D. H2SO4
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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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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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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 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 hydrolysis of Benzenetrizonide will yield three moles of?
A. Glyoxime
B. Glycol
C. Benzaldehyde
D. Glyoxal
Right Answer: D. Glyoxal
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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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Hydrolysis of alkyl nitriles for preparing carboxylic acids requires?
A. Acidic condition
B. Any of the above
C. Alkaline conditions
D. Both are simultaneously necessary
Right Answer: A. Acidic condition
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The correct order of equivalent conductance at infinite dilution among LiCl, NaCl and KCl is?
A. LiCl > NaCl > KCl
B. NaCl > KCl > LiCl
C. KCl > NaCl > LiCl
D. LiCl > KCl > NaCl
Right Answer: C. KCl > NaCl > LiCl
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The substituent of chlorine in water disinfection?
A. Ozone
B. Chloramines
C. Hypochlorous acid
D. All of the above
Right Answer: A. Ozone
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The organic compounds containing both the amino and the carboxyl group are called?
A. Carboxylic acids
B. Mineral acids
C. Amino acids
D. Polybasic acids
Right Answer: C. Amino Acids
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The main cause of ozone depletion is?
A. Acid rain
B. Use of CFCs
C. Global Warming
D. None of the above
Right Answer: B. Use of CFCs
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Which of the following is a secondary cell?
A. Dry Cell
B. Ni – Cd cell
C. Mercury Cell
D. Alkali Cell
Right Answer: B. Ni – Cd cell
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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 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 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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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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Yellowish brown gray haze refers to?
A. Oxidizing smog
B. Neutral smog
C. Reducing smog
D. Super smog
Right Answer: A. Oxidizing smog
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Milk of magnesia is?
A. Suspension of Ca(OH)2
B. Suspension of Mg Mg(OH)2
C. Suspension of Mg(OH)2 in water
D. Suspension of Ca(OH)2 and Mg(OH)2
Right Answer: C. Suspension of Mg(OH)2 in water
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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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What is the structure of water?
A. Trigonal
B. Angular
C. Linear
D. Tetragonal
Right Answer: B. Angular
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Esters are?
A. Acidic
B. Basic
C. Neutral
D. None of these
Right Answer: C. Neutral
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Which one of the following is the secondary pollutant of atmosphere?
A. CO2
B. SO3
C. NO2
D. H2SO4
Right Answer: D. H2SO4
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Tertiary alcohols with acidified dichromate gives?
A. Aldehydes
B. Alkenes
C. Ketones
D. Alkynes
Right Answer: B. Alkenes
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Molecular ions are produced in mass spectrometer. Which type of molecular ions are more abundant?
A. Negatively charged
B. Positively charged
C. H+ ions
D. Equal positive and negative ions
Right Answer: B. Positively charged
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Strecker reaction is used for synthesis of?
A. Alcohol
B. Amino acid
C. Aldehyde
D. Ketone
Right Answer: B. Amino 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 type of reaction occurs between ethane and hydrogen?
A. Addition
B. Dehydration
C. Neutraliization
D. Oxidation
Right Answer: A. Addition
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Elevation of boiling point can be best studied by?
A. Beckmann’s method
B. Landsberger’s method
C. Gibb’s method
D. None of the above
Right Answer: B. Landsberger’s method
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Standard hydrogen electrode has an arbitrary fixed potential of?
A. 0 V
B. 0.1 V
C. 1.0 V
D. 0.001 V
Right Answer: A. 0 V
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Which of the following statement is true about galvanic cell?
A. Anode is positively charged
B. Cathode is positively charged
C. Reduction occurs at anode
D. Reduction occurs at cathode
Right Answer: D. Reduction occurs at cathode
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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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The reagent which attacks a region where the electron density is high is called?
A. Nucleophile
B. Substrate
C. Electrophile
D. None of these
Right Answer: C. Electrophile
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Magnesium metal is extracted by the electrolysis of its
A. Concentrated aqueous solution of its chloride
B. Dilute aqueous solution on of its chloride
C. Its fused chloride
D. Any solution
Right Answer: C. Its fused chloride
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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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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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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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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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When α-bromo acids react with _______ they produced amino acids.
A. CO2
B. H2O
C. NH3
D. HCN
Right Answer: C. NH3
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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 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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Which one metal shows maximum oxidation state?
A. Mn
B. Ag
C. Cr
D. Hg
Right Answer: A. Mn
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Mass in grams of 10 moles of aspartame (C14H18N2O5)?
A. 29400 g
B. 2940 g
C. 2850 g
D. 2800
Right Answer: B. 2940 g
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The oxidation state of carbon-atom in glucose is?
A. +4
B. +6
C. -4
D. None of these
Right Answer: D. None of these
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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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Excess alcohol at low temperature in presence of conc. H2SO4 produce?
A. Ether
B. Ester
C. Organic acid
D. Alkene
Right Answer: A. Ether
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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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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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Which of the following can differ in different acids?
A. R Group
B. Carbonyl oxygen can be replaced in different amino acids
C. Carbonyl group
D. Amino Group
Right Answer: A. R Group
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Which of the following is not a characteristic of SiO2?
A. High transparency to light
B. Very low thermal expansion
C. Solubility in aqua rigia
D. Excellent insulator
Right Answer: C. Solubility in aqua rigia
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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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NHCommunities are _________ collection of organism.
A. Static
B. Dynamic
C. Biosphere
D. Random
Right Answer: B. Dynamic
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Which one complex is more stable?
A. [Cu(H2O)6]2+
B. [CuCl4]2-
C. [Pt(C2O4)2]2-
D. All have same stability
Right Answer: C. [Pt(C2O4)2]2-
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Benzene is heated in air with V2O5 at 450°C it undergoes?
A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Oxidation reaction
Right Answer: D. Oxidation reaction
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The dipolar structure of α-amino acids are called?
A. Internal salt
B. Double salt
C. Carboxylate salt
D. Basic salt
Right Answer: A. Internal salt
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Tertiary alkyl halide give?
A. SN1 and E1 reaction
B. SN2 and E1 reaction
C. SN2 and E2 reaction
D. None of the above
Right Answer: A. SN1 and E1 reaction
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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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Cellulose has structure like?
A. Amylose
B. Amylopectin
C. Linear chain
D. Glucose
Right Answer: C. Linear chain
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Which of the following fertilizer provides to soil 75% neutrients?
A. Urea
B. Calcium superphosphate
C. Diammonium phosphate
D. Pottasium nitrate
Right Answer: C. Diammonium phosphate
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Colligative property is not represented by?
A. Elevation of boiling point
B. Osmotic pressure
C. Freezing point
D. Relative lowering of vapor pressure
Right Answer: C. Freezing point
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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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