Basic Concepts Of Chemistry Test-02

Basic Concepts Of Chemistry Test-02

This is Basic concepts of chemistry Test-02 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
One mole is the amount of a substance that contains as many particles or entities as there are atoms in
  • A
    exactly 12 g (or 0.012 kg) of the $^{13}C$ isotope
  • B
    exactly 12 g (or 0.012 kg) of the $^{12}C$ isotope
    Correct
  • C
    exactly 12 g (or 0.012 kg) of the $^{14}C$ isotope
  • D
    exactly 14 g (or 0.012 kg) of the $^{14}C$ isotope
2
A given compound always contains exactly the same proportion of elements by weight. This law is stated by
  • A
    Proust
    Correct
  • B
    Avagadro
  • C
    Gay Lussac
  • D
    Dalton
3
Avogadro constant is
  • A
    The number of electrons in 1 mol
  • B
    The number of entities in 1 mol
    Correct
  • C
    The number of protons in 1 mol
  • D
    The number of atoms in 1 mol
4
An empirical formula represents the simplest
  • A
    ratio of masses of various atoms present in a compound
  • B
    whole number ratio of various elements present in a compound
  • C
    whole number ratio of various atoms present in a compound
    Correct
  • D
    average decimal ratio of various atoms present in a compound
5
Molecular formula shows the.
  • A
    ratio of masses of various atoms present in a compound
  • B
    average decimal ratio of various atoms present in a compound
  • C
    the exact number of different types of atoms present in a molecule of a compound
    Correct
  • D
    whole number ratio of different types of atoms present in a molecule of a compound
6
According to the law of conservation of mass, a balanced chemical equation has
  • A
    the same ratio of atoms of each element on both sides of the equation
  • B
    the same number of atoms of each element on both sides of the equation
    Correct
  • C
    the same number of protons of each element on both sides of the equation
  • D
    the same number of electrons of each element on both sides of the equation
7
Molarity is defined as
  • A
    the number of moles of the solvent in 1 litre of the solution
  • B
    the number of moles of the solute in 1 litre of the solution
    Correct
  • C
    the number of moles of the solute in 1 m3 of the solution
  • D
    the number of grams of the solute in 1 litre of the solution
8
The calculation of masses (sometimes volumes also) of the reactants and the products involved in a chemical reaction is called
  • A
    normality
  • B
    molarity
  • C
    stoichiometry
    Correct
  • D
    molality
9
Molecular mass of glucose $\left( {{C_6}{H_{12}}{O_6}} \right)$ is
  • A
    192.162
  • B
    198.162
  • C
    186.162.
  • D
    180. 162
    Correct
10
Choose the most appropriate answer amongst the options given below for the statement. A solution of a desired concentration is prepared by diluting
  • A
    solution of known higher concentration
  • B
    solution of known lower concentration
  • C
    from a serially diluted solution
  • D
    stock solution.
    Correct
11
the number of moles of solute present in 1 kg of solvent is called:
  • A
    molality
    Correct
  • B
    Normality
  • C
    molarity
  • D
    atomic mass unit
12
The density of 3 M solution of NaCl is1.25 g mL-1. Calculate molality of the
  • A
    1.79 m
  • B
    2.79 m
    Correct
  • C
    0.79 m
  • D
    2.09 m
13
0.2M NaOH means
  • A
    0.2 moles of NaOH in 100 mL of solution
  • B
    0.2 moles of NaOH in 10 mL of solution
  • C
    0.2 moles of NaOH in 1/2 lire of solution
  • D
    0.2 moles of NaOH in 1 lire of solution
    Correct
14
A solution is prepared by adding 2 g of a substance A to 18 g of water. Calculate the mass per cent of the solute
  • A
    11 %
  • B
    10 %
    Correct
  • C
    10.5 %
  • D
    11.11%
15
----- Fe + ----- $H_2SO_4$ → ----- $Fe_2(SO_4)_3$ + ----- H2 . This equation can be balanced by inserting the following in blank spaces
  • A
    2,3,1,3
    Correct
  • B
    2,3,32
  • C
    2,1,3,3
  • D
    2,2,3,3