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Latest KVS PGT Chemistry Exam Question (Objective Questions), MCQ in English

Subjects : Subject Knowledge Test (Chemistry)

Question Bank KVS PGT Chemistry Tier 2 Exam - English
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Subject Knowledge Test (Chemistry)

Question 1Single Answer
10-6 M NaOH is diluted 100 times. The pH of the diluted base is
  1. A
    between 7 and 8
  2. B
    between 5 and 6
  3. C
    between 6 and 7
  4. D
    between 10 and 11
Question 2Single Answer
In the electrolysis of acidulated water, it is desired to obtain 1.12 cc of hydrogen per second under STP condition. The current to be passed is
  1. A
    1.93 A         
  2. B
    9.65 A
  3. C
    19.3 A        
  4. D
    0.965 A
Question 3Single Answer
The one which decreases with dilution is
  1. A
    molar conductance
  2. B
    conductance
  3. C
    specific conductance
  4. D
    equivalent conductance
Question 4Single Answer
Vapour pressure of pure ‘A’ is 70 mm of Hg at 25oC. It forms an ideal solution with ‘B’ in which mole fraction of A is 0.8. if the vapour pressure of the solution is 84 mm of Hg at 25oC, the vapour pressure of pure ‘B’ at 25oC is
  1. A
    28 mm   
  2. B
    56 mm
  3. C
    70 mm    
  4. D
    140 mm
Question 5Single Answer
A 6% solution of urea is isotonic with
  1. A
    1 M solution of glucose
  2. B
    0.05 M solution of glucose
  3. C
    6% solution of glucose
  4. D
    25% solution of glucose
Question 6Single Answer
Which of the following is not a synthetic fibre:
  1. A
    Anygora
  2. B
    Rayon
  3. C
    Nylon
  4. D
    Polyster
Question 7Single Answer
Which one of the following is not contained in Portland cement ?
  1. A
    Ca3Al2O6
  2. B
    Ca3SiO5
  3. C
    Ca2Si­O4
  4. D
    Ca3(PO4)2
Question 8Single Answer
What is the reson for white cement to be white ?
  1. A
    It does not contain carbon
  2. B
    It does not contain silicon
  3. C
    It does not contain iron
  4. D
    It does not contain calcium
Question 9Single Answer
Which fertilizer is assimilated directly by the plant ?
  1. A
    Super phosphate
  2. B
    Nitrolim
  3. C
    Muriate of Potash
  4. D
    Humus
Question 10Single Answer
Which of the following chemicals is used in foam fire extinguishers ?
  1. A
    Aluminium sulphate
  2. B
    Copper sulphate
  3. C
    Cobalt sulphate
  4. D
    Nickel sulphate 
Question 11Single Answer
Chemistry is mainly concerned with the study of?
  1. A
    Matter and its properties
  2. B
    Energy and its transformation
  3. C
    Life and living organisms
  4. D
    Earth and atmosphere
Question 12Single Answer
Which of the following best defines matter?
  1. A
    Anything that reacts chemically
  2. B
    Anything that can be seen
  3. C
    Anything that releases energy
  4. D
    Anything that has mass and occupies space
Question 13Single Answer
The smallest particle of an element that can take part in a chemical reaction is?
  1. A
    Atom
  2. B
    Molecule
  3. C
    Ion
  4. D
    Electron
Question 14Single Answer
Which law states that mass is neither created nor destroyed in a chemical reaction?
  1. A
    Law of definite proportions
  2. B
    Law of multiple proportions
  3. C
    Avogadro’s law
  4. D
    Law of conservation of mass
Question 15Single Answer
The law of definite proportions was proposed by?
  1. A
    Dalton
  2. B
    Avogadro
  3. C
    Lavoisier
  4. D
    Proust
Question 16Single Answer
According to the law of multiple proportions, when two elements combine they do so in?
  1. A
    Same mass ratio
  2. B
    Continuous ratio
  3. C
    Simple whole number ratio
  4. D
    Random ratio
Question 17Single Answer
Dalton’s atomic theory postulated that atoms are?
  1. A
    Divisible
  2. B
    Indestructible
  3. C
    Made of protons and electrons
  4. D
    Variable in mass
Question 18Single Answer
Which postulate of Dalton’s theory is incorrect in the light of modern chemistry?
  1. A
    Atoms combine in whole numbers
  2. B
    Atoms rearrange in reactions
  3. C
    Atoms of different elements differ
  4. D
    Atoms are indivisible
Question 19Single Answer
A molecule is defined as?
  1. A
    Smallest particle of matter
  2. B
    Smallest particle of an element
  3. C
    Charged particle
  4. D
    Smallest particle of a compound capable of independent existence
Question 20Single Answer
The atomic mass unit (amu) is defined relative to?
  1. A
    Hydrogen atom
  2. B
    Oxygen atom
  3. C
    Carbon-12 atom
  4. D
    Helium atom
Question 21Single Answer
One atomic mass unit is equal to?
  1. A
    Mass of one hydrogen atom
  2. B
    1/16 mass of oxygen atom
  3. C
    Mass of one neutron
  4. D
    1/12 mass of carbon-12 atom
Question 22Single Answer
The relative atomic mass of an element is?
  1. A
    Absolute mass of atom
  2. B
    Mass in grams
  3. C
    Ratio of mass of atom to 1 amu
  4. D
    Mass in kilograms
Question 23Single Answer
Molecular mass is defined as?
  1. A
    Mass of one atom
  2. B
    Average atomic mass
  3. C
    Mass of one mole
  4. D
    Sum of atomic masses of all atoms in a molecule
Question 24Single Answer
The SI unit of amount of substance is?
  1. A
    Gram
  2. B
    Kilogram
  3. C
    Mole
  4. D
    Litre
Question 25Single Answer
One mole of any substance contains?
  1. A
    6.022 × 1023 particles
  2. B
    1.66 × 10-24 particles
  3. C
    3.011 × 1023 particles
  4. D
    1023 particles
Question 26Single Answer
Avogadro number represents the number of?
  1. A
    Atoms in 1 g of substance
  2. B
    Particles in one mole
  3. C
    Molecules in 1 litre of gas
  4. D
    Atoms in 1 amu
Question 27Single Answer
Molar mass is expressed in?
  1. A
    g mol-1
  2. B
    kg
  3. C
    amu
  4. D
    mol g-1
Question 28Single Answer
The mass of one mole of carbon-12 is?
  1. A
    6 g
  2. B
    12 g
  3. C
    14 g
  4. D
    1 g
Question 29Single Answer
The number of moles is calculated by?
  1. A
    Mass ÷ molar mass
  2. B
    Mass × molar mass
  3. C
    Molar mass ÷ mass
  4. D
    Mass × Avogadro number
Question 30Single Answer
Percentage composition refers to?
  1. A
    Mole percentage
  2. B
    Volume percentage of gases
  3. C
    Mass percentage of elements in a compound
  4. D
    Atomic percentage
Question 31Single Answer
Empirical formula represents?
  1. A
    Actual number of atoms
  2. B
    Structural arrangement
  3. C
    Molecular mass
  4. D
    Simplest whole number ratio of atoms
Question 32Single Answer
Molecular formula represents?
  1. A
    Simplest ratio of atoms
  2. B
    Ionic composition
  3. C
    Actual number of atoms in a molecule
  4. D
    Percentage composition
Question 33Single Answer
The relation between molecular and empirical formula is?
  1. A
    Molecular = n × Empirical
  2. B
    Molecular = Empirical
  3. C
    Empirical = n × Molecular
  4. D
    Both are unrelated
Question 34Single Answer
The value of ‘n’ is obtained by?
  1. A
    Empirical mass ÷ molecular mass
  2. B
    Atomic mass ÷ molecular mass
  3. C
    Molecular mass ÷ empirical mass
  4. D
    Molecular mass ÷ atomic mass
Question 35Single Answer
Stoichiometry deals with?
  1. A
    Structure of atoms
  2. B
    Quantitative relationships in reactions
  3. C
    Reaction mechanisms
  4. D
    Chemical bonding
Question 36Single Answer
A balanced chemical equation obeys the law of?
  1. A
    Conservation of mass
  2. B
    Multiple proportions
  3. C
    Definite proportions
  4. D
    Gaseous volumes
Question 37Single Answer
Limiting reagent is the reactant which?
  1. A
    Is present in excess
  2. B
    Limits the amount of product formed
  3. C
    Has higher molar mass
  4. D
    Reacts last
Question 38Single Answer
The reactant present in excess after reaction completion is called?
  1. A
    Limiting reagent
  2. B
    Catalyst
  3. C
    Excess reagent
  4. D
    Product
Question 39Single Answer
A chemical equation represents?
  1. A
    Qualitative change only
  2. B
    Quantitative change only
  3. C
    Both qualitative and quantitative changes
  4. D
    Physical change
Question 40Single Answer
Which of the following is a chemical change?
  1. A
    Rusting of iron
  2. B
    Boiling of water
  3. C
    Melting of ice
  4. D
    Dissolution of sugar
Question 41Single Answer
Matter exists mainly in how many physical states?
  1. A
    Two
  2. B
    Five
  3. C
    Four
  4. D
    Three
Question 42Single Answer
Which state of matter has definite shape and volume?
  1. A
    Plasma
  2. B
    Liquid
  3. C
    Gas
  4. D
    Solid
Question 43Single Answer
The smallest unit of a compound is?
  1. A
    Atom
  2. B
    Molecule
  3. C
    Ion
  4. D
    Element
Question 44Single Answer
Which of the following is a pure substance?
  1. A
    Air
  2. B
    Brass
  3. C
    Distilled water
  4. D
    Soil
Question 45Single Answer
An element cannot be broken down by?
  1. A
    Chemical methods
  2. B
    Physical methods
  3. C
    Nuclear methods
  4. D
    Electrical methods
Question 46Single Answer
A compound always has?
  1. A
    Fixed composition
  2. B
    Variable composition
  3. C
    Random composition
  4. D
    Physical mixture
Question 47Single Answer
Which of the following is a mixture?
  1. A
    Sodium chloride
  2. B
    Air
  3. C
    Carbon dioxide
  4. D
    Water
Question 48Single Answer
Homogeneous mixtures are also called?
  1. A
    Suspensions
  2. B
    Colloids
  3. C
    Solutions
  4. D
    Compounds
Question 49Single Answer
Which law explains the constant composition of water?
  1. A
    Law of conservation of mass
  2. B
    Avogadro’s law
  3. C
    Law of multiple proportions
  4. D
    Law of definite proportions
Question 50Single Answer
The atomicity of oxygen gas is?
  1. A
    1
  2. B
    3
  3. C
    2
  4. D
    4
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