Questions: Top Chemistry MCQS

Question 51: Who discovered carbohydrates fats and proteins?

A Anselme Payen
B Walter Bradford Cannon
C Jons Jacob Berzelius
D William Prout

Explanation: The correct answer to the question is: William Prout

Question 52: During electrolysis of Water, the product obtained at cathode is ___________?

A Oxygen Gas &Water
B Hydrogen Gas &Water
C Only Water
D Only oxygen

Explanation: The correct answer to the question is: Hydrogen Gas &Water

Question 53: Which of the following is the weakest reducing agent ?

A HC
B HBr
C HI
D HF

Explanation: The correct answer to the question is: HF

Question 54: During sulphonation of benzene H2SO4 generates the electrophile _________________?

A H+
B SO3
C SO2
D HSO4-

Explanation: The correct answer to the question is: SO3

Question 55: Size of colloidal particles

A In b/w true solution & suspension
B greater than suspension
C None of These
D greater than true solution

Explanation: The correct answer to the question is: In b/w true solution & suspension

Question 56: Which of the following statements is incorrect about fluorine_______________?

A both B and C
B fluorine follows octet rule and as well as extended octet rule
C fluorine is restricted to -1 oxidation state
D fluorine has lowest dissociation energy among the halogens

Explanation: The correct answer to the question is: both B and C

Question 57: Which of the following compounds has the empirical formula CH2O and reacts with sodium hydroxide ?

A carbonic acid
B acetic acid
C ethanol
D methanoic acid

Explanation: The correct answer to the question is: acetic acid

Question 58: Antiseptic Urotropine formed by ____________?

A Formaldehyde
B Carboxylic acid
C Ketone
D Acetaldehyde

Explanation: The correct answer to the question is: Formaldehyde

Question 59: Hydrogenolysis results in the formation of________________?

A aldehydes
B alkane
C alkyne
D alkene

Explanation: The correct answer to the question is: alkane

Question 60: Which of the following reaction is not shown by ketones ?

A reaction with NaHSO3
B reaction with 2 4 dinitrophenyl hydrazine
C reaction with HCN
D reaction with Fehling solution

Explanation: The correct answer to the question is: reaction with Fehling solution

Question 61: Which one is Chloroform_________________?

A CH3Cl
B CH2Cl2
C CHCl3
D CCl4

Explanation: The correct answer to the question is: CHCl3

Question 62: Which of the following is not the name of any scientist?

A Pauli exclusion principle
B Hund’s rule
C Le-Chatelier’s principle
D Aufbau’s principle

Explanation: The correct answer to the question is: Aufbau’s principle

Question 63: Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide & aluminum chloride is known as__________________?

A Clemmenson reduction
B Friedel & Craft alkylation
C Dows process
D Friedel & Craft acylation

Explanation: The correct answer to the question is: Friedel & Craft alkylation

Question 64: Methyl alcohol is not used__________________?

A For denaturing of ethyl alcohol
B As a solvent
C As a substitute for petrol
D As an antifreezing agent

Explanation: The correct answer to the question is: As a substitute for petrol

Question 65: Phonon is Quantum of___________?

A Elastic wave
B Transverse wave
C Electromagnetic wave
D Longitudinal wave

Explanation: The correct answer to the question is: Elastic wave

Question 66: Aluminium oxide is_________________?

A It does not exists
B Acidic oxide
C Basic oxide
D Amphoteric oxide

Explanation: The correct answer to the question is: Amphoteric oxide

Question 67: Which one of the following is also known as lactic acid ?

A 2-hydroxy butanoic acid
B 3-Hydroxy propanoic acid
C 3-hydroxy butanoic acid
D 2-Hydroxy propanoic acid

Explanation: The correct answer to the question is: 2-Hydroxy propanoic acid

Question 68: How much solar flux absorb by earth’s surface is used to drive hydrologic cycle:

A 1/3rd
B 1/4th
C 1/2sec
D 1/5th

Explanation: The correct answer to the question is: 1/3rd

Question 69: Ncleophilic addition reactions are catalysed__________________?

A None
B Both A and B
C Acid
D Base

Explanation: The correct answer to the question is: Both A and B

Question 70: Oxidation state +1 for phosphorous is found in___________?

A H3PO4
B H2P2O7
C H3PO3
D H3PO2

Explanation: The correct answer to the question is: H3PO2

Question 71: In Dry cell, cathode is made up of_______?

A ZnCl²
B Carbon (Graphite)
C MnO²(Pyrolusite)
D Zinc

Explanation: The correct answer to the question is: Carbon (Graphite)

Question 72: Which one of the following is termed as benzul alcohol ?

A C6H5CH(OH)2
B C6H5OH
C C6H5COOH
D C6H5CH2OH

Explanation: The correct answer to the question is: C6H5CH2OH

Question 73: Which of the following substances does not give iodoform test ?

A acetone
B acetaldehyde
C methyl alcohol
D ethyl alcohol

Explanation: The correct answer to the question is: methyl alcohol

Question 74: The purpose of Smelting an ore is to________?

A Obtain an alloy
B Reduce it
C Separate volatile impurities
D Oxidize it

Explanation: The correct answer to the question is: Reduce it

Question 75: On reduction with LiAlH4 ,Ketone gives__________?

A None of These
B Primary Alcohol
C Secondary Alcohol
D Tertiary alcohol

Explanation: The correct answer to the question is: Secondary Alcohol

Question 76: Which one of the following methods will not give benzene ?

A Heating sod. Salt of Benzoic acid with soda lime
B Chlorobenzene with NaOH at 360°C & 150atm.
C Hydrolysis of benzene sulphonic acid with super heated steam
D Distilling phenol with Zn dust

Explanation: The correct answer to the question is: Chlorobenzene with NaOH at 360°C & 150atm.

Question 77: Bromine can be liberated from KBr solution by the action of _______________?

A Ki
B Iodine solution
C Chlorine
D NaCl

Explanation: The correct answer to the question is: Chlorine

Question 78: Methyl radical is ___________?

A Sp2 hybrid having 6 electron
B Sp3 hybrid having 8 electrons
C sp2 hybrid having 7 electron
D Sp hybrid having linear geometry

Explanation: The correct answer to the question is: sp2 hybrid having 7 electron

Question 79: Give Electronic configuration of Sodium:

A None of these
B 1s2,2s2,2p6
C 1s2,2s2,2p6,3s1
D 1s2,2s2,2p6,3s2

Explanation: The correct answer to the question is: 1s2,2s2,2p6,3s1

Question 80: The most electronegative element among the following is_________________?

A Sb
B P
C As
D N

Explanation: The correct answer to the question is: N

Question 81: A theoretical link between quantum mechanics and thermodynamics is_________?

A Statistical thermodynamics
B Soectroscopic analysis
C Electrchemistry
D Matrix mechanics

Explanation: The correct answer to the question is: Statistical thermodynamics

Question 82: Which of the following has lowest lattice energy?

A NaCl
B CsI
C LiF
D KBr

Explanation: The correct answer to the question is: CsI

Question 83: Ketones and Aldehydes are differentiate by using ______________?

A Nitroprusside test
B Fehling solution
C Bendict solution
D Silver Mirror test

Explanation: The correct answer to the question is: Nitroprusside test

Question 84: Nitration of chlorobenzene gives___________________?

A o – chloronitrobenzene
B m – chloronitrobenzene
C A & B
D p – chloronitrobenzene

Explanation: The correct answer to the question is: A & B

Question 85: What is the molecular Weight of Nitric acid (HNO3 ) ?

A 65.012 g/mol
B 81.011 g/mol
C 63.012 g/mol
D 70.012 g/mol

Explanation: The correct answer to the question is: 63.012 g/mol

Question 86: Which of the following will be acidic_____________?

A all of the above
B ethyne
C 1-butyne
D propyne

Explanation: The correct answer to the question is: all of the above

Question 87: Which of the following is soluble in water?

A AgI
B AgF
C AgBr
D AgCl

Explanation: The correct answer to the question is: AgF

Question 88: How many electrons are there in benzene to form delocalized electron cloud________________?

A 6
B 3
C 4
D 8

Explanation: The correct answer to the question is: 6

Question 89: Which of the following is different with respect to physical appearance ?

A Arsenic
B Phosphorus
C Antimony
D Bismuth

Explanation: The correct answer to the question is: Phosphorus

Question 90: Alkanes containing a methyl group on main chain at 2nd carbon are called________________?

A iso-alkane
B branched-alkane
C neo-alkane
D normal-alkane

Explanation: The correct answer to the question is: iso-alkane

Question 91: Molozonide is unstable and changes into ozonide on_________________?

A oxidation
B rearrangement
C reduction
D hydrolysis

Explanation: The correct answer to the question is: rearrangement

Question 92: Which one of following is not a property of pure quartz ?

A Coloured solid
B All of above
C Brittle
D Hard

Explanation: The correct answer to the question is: Coloured solid

Question 93: SO2 reacts with Cl in sunlight to form__________?

A Sulphuryl chloride
B Sulphur dioxide
C Suphanyl chloride
D All of the above

Explanation: The correct answer to the question is: Sulphuryl chloride

Question 94: The IUPAC suffix used for _______ NC group?

A Isocyanides
B Cyanide
C Nitrile
D Carbylamines

Explanation: The correct answer to the question is: Nitrile

Question 95: Identify among the following elements that does NOT belong to VIIA group

A N
B F
C Br
D Cl