Basic Concepts Of Chemistry Test

Basic Concepts Of Chemistry

This is Basic concepts of chemistry Test-05 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
What is the mass of 1 molecule of $O_2$?
  • A
    7.32 x $10^{-23}$g
  • B
    6.32 x $10^{-23}$g
  • C
    4.32 x $10^{-23}$g
  • D
    5.32 x $10^{-23}$g
    Correct
2
What is the mass of 1 mole of O2?
  • A
    16 g
  • B
    32 g
    Correct
  • C
    48 g
  • D
    45 g
3
For the reaction of $C_4H_10$ is combusted in 1000 g of O2. The yield of $H_2O$ and the limiting agent in the reaction are
Question 3 figure 1
  • A
    459 and $O_2$
  • B
    435 and $O_2$
  • C
    450 and $O_2$
  • D
    432 and $O_2$
    Correct
4
How many molecules of H2O are there in 18g of water? (Hint: Avagadro’s Number = 6.02 x $10^{23}$ atoms/mol)
  • A
    7.02 x $10^{23}$
  • B
    8.02 x $10^{23}$
  • C
    5.02 x $10^{23}$
  • D
    6.02 x $10^{23}$
    Correct
5
For the reaction
  • A
    $CO_2$
  • B
    CO
  • C
    $Fe_2O_3$
    Correct
  • D
    Fe
6
For the reaction 224 g of CO is available to react with 400 g $Fe_2O_3$ , the yield of iron and $CO_2$, are:
Question 6 figure 1
  • A
    210 and 279 g
  • B
    210 and 290
  • C
    280 and 330 g
    Correct
  • D
    225 and 279
7
For the reaction 224 g of CO is available to react with 400 g $Fe_2O_3$ , the yield of iron and $CO_2$, are:
Question 7 figure 1
  • A
    $N_2H_4$
  • B
    $N_2O_4$
    Correct
  • C
    $N_2$
  • D
    $H_2O$
8
For the reaction is mixed with 160 g $N_2O_4$, the yield of $H_2O$ is
Question 8 figure 1
  • A
    1245 g
  • B
    105 g
  • C
    115 g
  • D
    124.56 g
    Correct
9
How many atoms of hydrogen are in 67.2 L of $H_2$ at STP?
  • A
    5.612x $10_24$
  • B
    3.612x $10_24$
    Correct
  • C
    4.612x $10_24$
  • D
    2.612x $10_24$
10
Chemistry does not play a major role in
  • A
    Explaining ozone depletion
  • B
    Large scale production of a variety of fertilizers
  • C
    Explaining superconductivity
    Correct
  • D
    Design and synthesis new materials having specific magnetic, electric and optical properties.
11
SI unit of density is
  • A
    kg $m^{-2}$
  • B
    kg $m^3$
  • C
    kg$^{-1} m^3$
  • D
    kg $m^{-3}$
    Correct
12
Molecular formula shows the.
  • A
    whole number ratio of different types of atoms present in a molecule of a compound
  • B
    average decimal ratio of various atoms present in a compound
  • C
    ratio of masses of various atoms present in a compound
  • D
    the exact number of different types of atoms present in a molecule of a compound
    Correct
13
There are ____ in 0.05 ml?
  • A
    5 liters
  • B
    0.0005 liters
  • C
    0.00005 liters
    Correct
  • D
    50 liters
14
The molar mass of $AgNO_3$ is
  • A
    189.9
  • B
    169.9 g
    Correct
  • C
    159.9
  • D
    179.9
15
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 $^{14}C$ isotope
  • B
    exactly 12 g (or 0.012 kg) of the $^{12}C$ isotope
    Correct
  • C
    exactly 14 g (or 0.012 kg) of the $^{14}C$ isotope
  • D
    exactly 12 g (or 0.012 kg) of the $^{13}C$ isotope