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
Chemistry
Chemistry Mcqs with Answers solved online.
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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The alkyl halide molecule on which the nucleophilic attacks is called?
A. Electrophile
B. Substrate
C. Leaving group
D. Electrophilic centre
Right Answer: B. Substrate
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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 one of the following is not affect of acid rain?
A. It decrease the pH of natural rain
B. It damages the buildings
C. It leaches metals like aluminium mercury and lead from soil
D. It increase the percentage of CO2 in the atmosphere
Right Answer: D. It increase the percentage of CO2 in the atmosphere
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2-Pentanone and 3-Pentanone are?
A. Metamers
B. Functional group isomers
C. Geometrical isomers
D. Chain isomers
Right Answer: A. Metamers
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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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Which of the following halogen shows metallic luster?
A. Fluorine
B. Chlorine
C. Iodine
D. At
Right Answer: C. Iodine
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. In a given system, water and ice are in equilibrium, if the pressure is applied to the above system then?
A. More ice is formed
B. Amount of ice and water will remain the same
C. More ice is melted
D. Bot a and b
Right Answer: C. More ice is melted
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Iron can be prevented from rusting by?
A. Connecting iron to more electropositive metal, a case of cathodic protection
B. Connecting iron to more electropositive metal, a case of anodic protection
C. Connecting iron to less electropositive metal, a case of anodic protection
D. Connecting iron to less electropositive metal, a case of cathodic protection
Right Answer: B. Connecting iron to more electropositive metal, a case of anodic protection
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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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Which of the following reacts with aqueous alkaline iodine?
A. 1-Propanol
B. Methanol
C. Ethanol
D. 2-Methyl-2-propanol
Right Answer: C. Ethanol
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Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide and aluminum chloride is known as?
A. Dow’s process
B. Friedel and Craft alkylation
C. Friedel and Craft acylation
D. Clemmenson reduction
Right Answer: B. Friedel and Craft alkylation
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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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A solution of KCl in water contains?
A. Free formula units
B. Free ions
C. Free atoms
D. Free molecules
Right Answer: B. Free ions
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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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Sulphuric acid is king of chemicals, in its reactions it generally not act as?
A. An acid
B. A reducing agent
C. Dehydrating agent
D. Oxidizing agent
Right Answer: B. A reducing agent
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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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The acidic character of amino acids is due to?
A. Amino group
B. Carbonyl group
C. Carboxylate
D. Carbonyl oxygen
Right Answer: C. Carboxylate
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Saturated triglycerides of fatty acids?
A. Fats
B. Soaps
C. Oils
D. Detergents
Right Answer: A. Fats
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All alpha amino acids exist largely in proteins in the form of a dipolar structure is called?
A. Zwitter ion
B. Carbon-cation
C. Anion
D. None of these
Right Answer: A. Zwitter ion
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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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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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Which of the following formula is more reactive for hydrolysis?
A. -COOR
B. -COOH
C. -CONH2
D. -COCl
Right Answer: D. -COCl
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Dehydration of alcohols with conc. H2SO4 at 180°C gives?
A. Ethers
B. Alkenese
C. Alkyl halides
D. Esters
Right Answer: B. Alkenes
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The main advantage of recycling is?
A. Reduced raw material and energy costs
B. Reduced pollution hazards
C. Reduced waste volume
D. All of the above
Right Answer: D. All of the above
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Tetraethyl lead is prepared by reacting ethyl bromide with?
A. Pb
B. Pd
C. Na4Pb
D. NH3
Right Answer: C. Na4Pb
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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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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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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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Change in enthalpy of ∆H a system can be calculated by following relationship?
A. ∆H = ∆E-PV
B. ∆H = ∆E-Q
C. ∆H = ∆E+q
D. ∆H = ∆E+P∆V
Right Answer: D. ∆H = ∆E+P∆V
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Which of the following is an example of solid in solid solution?
A. Dust particles in smoke
B. Opals
C. Mercury metal in silver metal
D. All of the above
Right Answer: B. Opals
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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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The unit of rate constant of second order reaction is?
A. mol dm-3 sec-1
B. mol-2 dm+6
C. sec-1
D. mol-1 dm+3 sec-1
Right Answer: D. mol-1 dm+3 sec-1
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SN1 reactions are favoured in which solvent?
A. Non polar
B. Slightly polar
C. Polar
D. Solvents
Right Answer: C. Polar
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The contact process was first developed by?
A. Jabir bin hayyan
B. Birkeland
C. Henary
D. Knietsch
Right Answer: D. Knietsch
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One mole of a hydrocarbon X reacts completely with one mole of hydrogen gas in the presence of a heated catalyst. What could be the formula of X?
A. C2H6
B. C5H10
C. C3H8
D. C7H16
Right Answer: B. C5H10
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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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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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Thioalcohol is prepared when alkyl halide is reacted with?
A. OH–
B. SH–
C. NO–2
D. I–
Right Answer: C. NO–2
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Reduction of an aldehyde using NaBH4 gives?
A. Primary alcohol
B. Tertiary alcohol
C. Seconadry alcohol
D. Phenol
Right Answer: A. Primary alcohol
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Most of the reactions which give stable products are?
A. Endothermic
B. Isothermal
C. Exothermic
D. None of these
Right Answer: C. Exothermic
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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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NHCommunities are _________ collection of organism.
A. Static
B. Dynamic
C. Biosphere
D. Random
Right Answer: B. Dynamic
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The oxidation state of transition element is usually?
A. Variable
B. Constant
C. Single
D. Infinite
Right Answer: A. Variable
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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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Colligative properties can be used for calculating?
A. Density of a compound
B. Lattice energy of a compound
C. Molecular mass of a compound
D. All of the above
Right Answer: C. Molecular mass of a compound
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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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Which one of the following radical is called benzyl radical?
A. C6H5
B. C6H5 – CH
C. C6H5 – C
D. C6H5 – CH2
Right Answer: D. C6H5 – CH2
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Ea appears as a potential energy hill between _________ for carrying out the reaction.
A. Among the reactants
B. Reactants and the products
C. Among the products
D. None of the above
Right Answer: B. Reactants and the products
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The relative lowering of vapor pressure is equal to?
A. Mole fraction of solvent
B. Mole fraction of solution
C. Molar mass of solute
D. Mole fraction of solute
Right Answer: D. Mole fraction of solute
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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 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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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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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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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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Non-stoichiometric compounds of transition elements are called?
A. Hydrates
B. Hydrides
C. Binary compounds
D. Interstital compounds
Right Answer: D. Interstital compounds
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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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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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The separation of different isotopes in the mass spectrometer is done on the basis of?
A. Different amounts of positive change on each ion
B. Different m/e
C. Different e/m value
D. Velocities of the ions
Right Answer: C. Different e/m value
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A nanopeptide contains ________ peptide linkages.
A. 10
B. 8
C. 4
D. 9
Right Answer: B. 8
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Which one is mono haloalkane?
A. CH2Cl2
B. CHCl3
C. Ch3 – CH3 – CH2 – Cl
D. CCl4
Right Answer: C. Ch3 – CH3 – CH2 – Cl
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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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Which one used in containers and pipe work for reactive and corrosive chemicals?
A. Silicone polymers
B. Teflon
C. Steel
D. None of these
Right Answer: B. Teflon
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Why bleaching powder is always preserved in sealed plastic bags?
A. It is hydroscopic
B. It decomposed
C. Chlorine gas escapes
D. Calcium change in calcium hydroxide
Right Answer: C. Chlorine gas escapes
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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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Oxidation of SO2(g) in the presence of V2O5(s) is an example of?
A. Homogeneous catalysis
B. Auto catalysis
C. Heterogeneous catalysis
D. Negative catalysis
Right Answer: C. Heterogeneous catalysis
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If 75% of any given amount of radioactive element disintegrates in 60 min. The half life of radioactive element is.
A. 20 min
B. 30 min
C. 45 min
D. 25 min
Right Answer: B. 30 min
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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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“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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Acid rain can be due to the absorption of?
A. Oxides of C
B.Oxides of S
C. Oxides of N
D. All of the above
Right Answer: D. All of the above
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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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Which compound has only one structural form?
A. Ethane
B. Propane
C. Butane
D. Both a and b
Right Answer: D. Both a and b
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The optimum pH for enzyme activity is?
A. Less than 5
B. 6.4 to 6.9
C. More than 7
D. 9.4 to 9.6
Right Answer: B. 6.4 to 6.9
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Which one increases by common ion effect except?
A. Crystallization
B. Solubility
C. Association of ions
D. All of these
Right Answer: B. Solubility
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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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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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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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Hydrolysis of CH3CH2CN will synthesize?
A. Ethanoic acid
B. Methanoic acid
C. Propanoic acid
D. Gultamic acid
Right Answer: C. Propanoic acid
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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 pair can be used as a reactant for the preparation of acetyl chloride?
A. CH3COOH, HCl
B. CH3COOH, SOCl2
C. CH3, COOH, PCl5
D. Both b and c
Right Answer: D. Both b and c
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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 one can be used as test for phenol?
A. C6H5OH + CH3COCl in the presence of aq. NaOH
B. C6H5OH + HCHO in the presence of NaOH
C. C6H5OH ONa + CH3CH2 Br
D. C6H5OH + Br2 (excess)
Right Answer: D. C6H5OH + Br2 (excess)
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pH of an aqueous solution is 3.0 at 25°C. The hydrogen ion concentration in the solution would be?
A. 0.001
B. 0.01
C. 0.0001
D. 10-5
Right Answer: A. 0.001
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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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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 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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In a saturated solution of AgCl, the molar concentration of Ag+ and Cl- is 1.0 x 10-5 M each. What is the value of Ksp?
A. 1.0 x 10-5
B. 0.1 x 10-5
C. 1.0 x 10-15
D. 1.0 x 10-10
Right Answer: D. 1.0 x 10-10
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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 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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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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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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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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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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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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Which of the following is alkyl halide?
A. CH3Cl
B. CH2Cl2
C. C2H4Cl2
D. All of these
Right Answer: A. CH3Cl
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What sis the colour of Mn+2?
A. Pink
B. Violet
C. Purple
D. Green
Right Answer: A. Pink
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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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Which of the following is not a colligative property?
A. Density
B. Elevation of boiling point
C. Depression in freezing point
D. Osmotic pressure
Right Answer: A. Density
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Alcohol in which – OH group is attach to carbon which is further attach to only one alkyl group is?
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. None of these
Right Answer: A. Primary alcohol
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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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