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

Subjects : Subject Knowledge Test (Chemsitry)

Question Bank KVS LDE/LDCE PGT (Chemistry) Exam Tier 1 - English
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Subject Knowledge Test (Chemsitry)

Question 1Single 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 2Single 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 3Single 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 4Single 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 5Single Answer
The law of definite proportions was proposed by?
  1. A
    Dalton
  2. B
    Avogadro
  3. C
    Lavoisier
  4. D
    Proust
Question 6Single 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 7Single 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 8Single 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 9Single 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 10Single 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 11Single 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 12Single 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 13Single 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 14Single Answer
The SI unit of amount of substance is?
  1. A
    Gram
  2. B
    Kilogram
  3. C
    Mole
  4. D
    Litre
Question 15Single 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 16Single 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 17Single Answer
Molar mass is expressed in?
  1. A
    g mol-1
  2. B
    kg
  3. C
    amu
  4. D
    mol g-1
Question 18Single 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 19Single 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 20Single 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 21Single 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 22Single 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 23Single 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 24Single 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 25Single Answer
Stoichiometry deals with?
  1. A
    Structure of atoms
  2. B
    Quantitative relationships in reactions
  3. C
    Reaction mechanisms
  4. D
    Chemical bonding
Question 26Single 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 27Single 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 28Single 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 29Single 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 30Single 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 31Single Answer
Matter exists mainly in how many physical states?
  1. A
    Two
  2. B
    Five
  3. C
    Four
  4. D
    Three
Question 32Single Answer
Which state of matter has definite shape and volume?
  1. A
    Plasma
  2. B
    Liquid
  3. C
    Gas
  4. D
    Solid
Question 33Single Answer
The smallest unit of a compound is?
  1. A
    Atom
  2. B
    Molecule
  3. C
    Ion
  4. D
    Element
Question 34Single Answer
Which of the following is a pure substance?
  1. A
    Air
  2. B
    Brass
  3. C
    Distilled water
  4. D
    Soil
Question 35Single 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 36Single Answer
A compound always has?
  1. A
    Fixed composition
  2. B
    Variable composition
  3. C
    Random composition
  4. D
    Physical mixture
Question 37Single Answer
Which of the following is a mixture?
  1. A
    Sodium chloride
  2. B
    Air
  3. C
    Carbon dioxide
  4. D
    Water
Question 38Single Answer
Homogeneous mixtures are also called?
  1. A
    Suspensions
  2. B
    Colloids
  3. C
    Solutions
  4. D
    Compounds
Question 39Single 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 40Single Answer
The atomicity of oxygen gas is?
  1. A
    1
  2. B
    3
  3. C
    2
  4. D
    4
Question 41Single Answer
The mass of one mole of oxygen gas is?
  1. A
    16 g
  2. B
    32 g
  3. C
    8 g
  4. D
    64 g
Question 42Single Answer
A balanced equation ensures equality of?
  1. A
    Number of molecules
  2. B
    Number of atoms
  3. C
    Number of compounds
  4. D
    Volume of gases
Question 43Single Answer
The mole concept connects mass with?
  1. A
    Volume
  2. B
    Temperature
  3. C
    Pressure
  4. D
    Number of particles
Question 44Single Answer
Which of the following is not a postulate of Dalton’s atomic theory?
  1. A
    Atoms can be created and destroyed
  2. B
    Atoms of same element are identical
  3. C
    Atoms are indivisible
  4. D
    Atoms combine in whole numbers
Question 45Single Answer
Percentage composition is useful in determining?
  1. A
    Empirical formula
  2. B
    Atomic number
  3. C
    Valency
  4. D
    Isotopes
Question 46Single Answer
Which quantity remains conserved in a chemical reaction?
  1. A
    Mass
  2. B
    Pressure
  3. C
    Volume
  4. D
    Temperature
Question 47Single Answer
A chemical equation without physical states is called?
  1. A
    Skeletal equation
  2. B
    Balanced equation
  3. C
    Ionic equation
  4. D
    Thermochemical equation
Question 48Single Answer
Which of the following is an intensive property of matter?
  1. A
    Density
  2. B
    Volume
  3. C
    Mass
  4. D
    Amount
Question 49Single Answer
The molecular formula of a compound is determined using?
  1. A
    Isotopic mass
  2. B
    Atomic number
  3. C
    Valency only
  4. D
    Empirical formula and molar mass
Question 50Single Answer
A reaction in which heat is released is called?
  1. A
    Exothermic
  2. B
    Endothermic
  3. C
    Reversible
  4. D
    Neutral
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