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.
What is the Colour of K2Cr2O7 ?
A. Red
B. Green
C. Orange
D. Yellow
Right Answer: C. Orange
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Chloromethane is used in?
A. Production of silicone polymer
B. Petroleum refining
C. Manufacturing of butyle rubber
D. All of these
Right Answer: D. All of these
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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 one of the following substance is not used as disinfectant or chlorinating agent?
A. Cl2
B. NaClO
C. HOCl
D. NaCl
Right Answer: D. NaCl
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Ethanoic acid manufacturing through ethanol involves the use of?
A. Acidified potassium dichromate
B. Both a and c
C. Ammonical silver nitrate
D. Fehling’s solution
Right Answer: A. Acidified potassium dichromate
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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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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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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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Which of the following ketones will produce propanoic acid only after oxidation by acidified potassium dichromate?
A. Ethyl n-propyl ketone
B. Ethyl methyl ketone
C. Dimethyl ketone
D. Diethyl ketone
Right Answer: A. Ethyl n-propyl ketone
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Which of the following has maximum steric hindrance?
A. (C2H5)2CO
B. CH3COCH3
C. C3H7COCH3
D. CH3COH
Right Answer: C. C3H7COCH3
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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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Which of the following amino acid is optically inactive?
A. Phenyl amine
B. Asparagine
C. Glutamic acid
D. Glycine
Right Answer: D. Glycine
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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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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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The half life period of zero order reaction is equal to?
A. 0.693/K
B. 1/Ka
C. a/2
D. 1.5/Ka2
Right Answer: C. a/2
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Some O2 is present in water. The water will be considered as “polluted water” when concentration of O2 in it will be?
A. 4 – 8 ppm
B. Less than 4 ppm
C. Greater than 4 ppm
D. Greater than 8 ppm
Right Answer: B. Less than 4 ppm
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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 alkyl halide reacts with sodium metal in the presence of ether. Which product is formed?
A. Alkane with even number carbons
B. Alkane with odd number carbons
C. Alkene
D. Alcohol
Right Answer: A. Alkane with even number carbons
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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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The Kw of water at 25°C is given by?
A. 10-7
B. 10-10
C. 10-12
D. 10-14
Right Answer: D. 10-14
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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 is the example of proteins?
A. Albumin
B. Legumin
C. Globulin
D. All of these
Right Answer: D. All of these
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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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Dry ice (Solid CO2) has geometry?
A. Linear
B. Trigonal planer
C. Bent and angular
D. All of the above
Right Answer: A. Linear
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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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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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Maximum ammonia is used for the?
A. Explosive formation
B. Fertilizer itself
C. Manufacturing of fertilizer
D. Manufacturing of Nylon
Right Answer: C. Manufacturing of fertilizer
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Neo-pentyl alcohol is a type of alcohol?
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Aromatic alcohol
Right Answer: A. Primary alcohol
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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 is example of pentose?
A. Glucose
B. Glyceraldehyde
C. Ribose
D. All of these
Right Answer: C. Ribose
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What is the pH of ideal buffer?
A. 10
B. 7
C. Less than 7
D. 0
Right Answer: B. 7
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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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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 is alkyl halide?
A. CH3Cl
B. CH2Cl2
C. C2H4Cl2
D. All of these
Right Answer: A. CH3Cl
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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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Which of the following can be used for the oxidative preparation of aldehydes from alcohols?
A. Pt – asbestos
B. Na2Cr2O7 and H2SO4
C. FeO and MO2O3
D. All of these
Right Answer: D. All of these
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β- elimination reactions are due to?
A. Attack of the incoming nucleophile on alpha hydrogen
B. Attack of the incoming nucleophile on beta hydrogen
C. Attack of the incoming nucleophile on beta carbon
D. Attack of incoming nucleophiles on electrophilic carbon
Right Answer: B. Attack of the incoming nucleophile on beta hydrogen
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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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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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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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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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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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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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Coinage metals have least reactivity because they have?
A. Positive oxidation potentials
B. Zero oxidation potentials
C. Positive reduction potentials
D. Zero reduction potentials
Right Answer: C. Positive reduction potentials
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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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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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During combustion analysis, which one is used for absorbing carbon dioxide?
A. 50% KOH solution
B. Mg (ClO4)2
C. Silica gel and Mg (ClO4)2
D. Silica gel
Right Answer: A. 50% KOH solution
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Decomposition of H2O is?
A. Endothermic reaction
B. Exothermic reaction
C. Nuclear reaction
D. Zero nuclear reaction
Right Answer: A. Endothermic reaction
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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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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 naturally occurring amino acids are?
A. α-amino acids
B. β-Amino acids
C. γ-amino acids
D. All are included in naturally occurring
Right Answer: D. All are included in naturally occurring
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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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Organic acids (Carboxylic acids) are considered as?
A. Strong acids
B. Mild acids
C. Weak acids
D. Mineral acids
Right Answer: C. Weak acids
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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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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 is mono isotopic element?
A. Cl
B. H
C. F
D. Cd
Right Answer: C. F
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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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Why do farmers and gardeners often treat soil with ammonia sulphate?
A. To kill harmful insects
B. To reduce the acidity of the soil
C. To increase the nitrogen contents of the soil
D. To increase the oxygen contents of the soil
Right Answer: C. To increase the nitrogen contents of the soil
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Which ion will have maximum heat of hydration?
A. Na+
B. Cs2+
C. Ba2+
D. Mg2+
Right Answer: D. Mg2+
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Which of the following is the example of derived proteins?
A. Proteoses
B. Collagen
C. Enzymes
D. Both a and c
Right Answer: D. Both a and c
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Which of the following statement is correct?
A. Zn can replace Cu2+ in CuSO4
B. Cu can replace H+ in H2SO4
C. Cu can replace Zn2+ in ZnSO4
D. None of these
Right Answer: A. Zn can replace Cu2+ in CuSO4
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Carboxylic acids react with active metals (Na, K, Ca and Mg) to form their salt and?
A. H2O
B. H2O and CO2
C. CO2 only
D. H2 gas
Right Answer: D. H2 gas
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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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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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Which of the following halogen shows metallic luster?
A. Fluorine
B. Chlorine
C. Iodine
D. At
Right Answer: C. Iodine
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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 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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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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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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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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Which one is the name of given compound by IUAC system of nomenclature?
A. CH2 = CH – CH = CH2
B. But-2-ene
C. 2-methyl-1-ene
D. Buta -1, 3 – diene
Right Answer: D. Buta -1, 3 – diene
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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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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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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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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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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 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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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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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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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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NHCommunities are _________ collection of organism.
A. Static
B. Dynamic
C. Biosphere
D. Random
Right Answer: B. Dynamic
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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 process in which the orbitals of different energies and shape mix with each other to give equivalent hybrid orbitals is called?
A. Dissolution
B. Hybridization
C. Resonance
D. Ionization
Right Answer: B. Hybridization
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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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Which of the following not has equal number of atoms as that in 6g Molybdenum (Ar : 96)
A. 3 g O3
B. 4 g SO2
C. 4 g Ca
D. 5 g SO3
Right Answer: C. 4 g Ca
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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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If an electrophile is the attacking reagent which one is most reactive?
A. R – I
B. R – Br
C. R – Cl
D. R – F
Right Answer: D. R – F
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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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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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Which of the following statements regarding a catalyst is not true?
A. A catalyst does not alter the equilibrium in a reversible reaction
B. A catalyst can initiate the reaction which is not thermodynamically favourable
C. Catalytic reactions are very specific in nature
D. A catalyst remains unchanged in composition and quantity
Right Answer: B. A catalyst can initiate the reaction which is not thermodynamically favourable
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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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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 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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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 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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Gram atoms of hydrogen in 5.5g H2?
A. 5.50
B. 2.25
C. 5.45
D. 2.20
Right Answer: A. 5.50
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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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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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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 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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