Atoms And Molecules Test

Atoms And Molecules

This is Atoms and Molecules Test-04 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
One mole of \({{\text{N}}_{\text{2}}}\)is equal to-
  • A
    14g of Nitrogen
  • B
    All of these
  • C
    20 grams of Nitrogen
  • D
    \(6.022 \times {10^{23}}\)\({{\text{N}}_{\text{2}}}\)molecules
    Correct
2
Calculate the number of Mg atoms in 0.024 g of Mg
  • A
    \({\text{6}}.0{\text{22 }} \times {\text{ 1}}{0^{{\text{2}}0}}{\text{ }}\)Mg atoms
    Correct
  • B
    \({\text{6}}.{\text{22 }} \times {\text{ 1}}{0^{{\text{23}}}}{\text{ }}\)Mg atoms
  • C
    \({\text{6}}.0{\text{22 }} \times {\text{ 1}}{0^{{\text{25}}}}{\text{ }}\)Mg atoms
  • D
    \({\text{6}}.0{\text{22 }} \times {\text{ 1}}{0^{{\text{2}}0}}{\text{ }}\)Mg atoms
3
Statement A: mole is quite often known as chemists dozen Statement B: the mass of one twelfth (1/12) of the mass of one atom of carbon taken as 1u. Which of the two statement is true
  • A
    Neither Statement A nor Statement B.
  • B
    Statement A
  • C
    Statement B
  • D
    Both the Statements A and B
    Correct
4
12. How many molecules are present in one gram molecular mass of a substance?
  • A
    \({\text{3}}.0{\text{12 }} \times {\text{ 1}}{0^{{\text{23}}}}{\text{ }}\)atoms of oxygen
  • B
    \({\text{1}}/{\text{6}}.0{\text{22 }} \times {\text{ 1}}{0^{{\text{23}}}}{\text{ }}\)molecules
  • C
    \({\text{6}}.0{\text{22 }} \times {\text{ 1}}{0^{{\text{23}}}}\)molecules
    Correct
  • D
    2.3 atoms
5
The atomic mass of calcium is 40 the number of moles in 60 g of calcium are
  • A
    0.75 mol
  • B
    1.5 mol (Ans)
    Correct
  • C
    0.5 mol
  • D
    2.0 mol
6
Match the following with correct response. (1) Nitrate (2) Phosphide (3) Nitrite (4) Phosphate (A) \({P^{3 - }}\)(B) \(P{O_4}^{3 - }\)(C) \(N{O_2}^ - \)(D) \(N{O_3}^ - \)
  • A
    1-B, 2-D, 3-A, 4-C
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-D, 2-A, 3-C, 4-B
    Correct
  • D
    1-A, 2-C, 3-B, 4-D
7
Match the following with correct response. (1) \(PC{l_5}\) (2) \({N_2}{O_5}\)(3) \({N_2}{O_4}\)(4) \(CC{l_4}\)(A) Dinetrogen tetra oxide (B) Phosphorous pentachloride (C) Carbon tetra chloride (D) Dinitrogenpenta oxide
  • A
    1-D, 2-A, 3-C, 4-B
  • B
    1-B, 2-D, 3-A, 4-C
    Correct
  • C
    1-A, 2-C, 3-B, 4-D
  • D
    1-C, 2-B, 3-D, 4-A
8
Match the following with correct response. (1) 1 mole of \({O_2}\) (2) 1 mole of N (3) 1 mole of C (4) 1 mole of \({H_2}O\)(A) \(6.022 \times {10^{23}}\)molecules (B) 12g (C) \(6.022 \times {10^{23}}\)atoms (D) 18g
  • A
    1-B, 2-D, 3-A, 4-C
  • B
    1-D, 2-A, 3-C, 4-B
  • C
    1-A, 2-C, 3-B, 4-D
    Correct
  • D
    1-C, 2-B, 3-D, 4-A
9
Which is not true about \({H_2}S{O_4}?\) A It is composed of 2 Hydrogen, 1 Sulpher and 4 Oxygen atoms B It relative molecular mass is 98 C It is composed of one molecule of \({H_2}\)One atom S and two molecules \({O_2}\) D Its relative molecular mass is 108
  • A
    (c) and (d) are correct
    Correct
  • B
    (b) and (c) are correct
  • C
    All of these
  • D
    (a), (b) and (c) are correct
10
Which of the following is correct definition of a mole? A It is equal to the gram atomic mass of the substance B It contain \(6.022 \times {10^{20}}\)atoms of a given substance C It is equal to gram molecular mass of the substance D It contain \(6.022 \times {10^{23}}\)molecules of a given substance
  • A
    All of these
  • B
    (b) and (c) are correct
  • C
    (a) and (b) are correct
  • D
    (a), (c) and (d) are correct
    Correct
11
Which of the following is in correct chemical formula of the given compound? A Zinc Phosphate - \(Z{n_3}{(P{O_4})_2}\) B Ferric carbonate - \(F{e_3}{\left( {C{O_3}} \right)_2}\) C Calcium Phosphate - \(C{a_3}P{O_4}\) D Sodium Sulphide-\(N{a_2}S\)
  • A
    All of these
  • B
    (b) and (c) are correct
    Correct
  • C
    (a), (b) and (c) are correct
  • D
    (a) and (b) are correct
12
Identify the correct statement
  • A
    Dalton was the first to state that the smallest indivisible portion of matter is an atom.
    Correct
  • B
    The law of conservation of mass was given by Louis Proust.
  • C
    The law of constant was stated by A Lavoisier.
  • D
    The molecules of noble gas elements are diatomic in nature.
13
Statement A: + veion migrates towards cathode on passing electric current. Statement B: Some of the atoms of the elements have actually fractional mass. Which of the two statements is true?
  • A
    Both the Statement A and B
  • B
    Statement A
    Correct
  • C
    Neither Statement A nor Statement B
  • D
    Statement B
14
Match the following with correct response. (1) Ions (2) Anions(3) Cation (4) Radical (A) Negatively charged (B) Polyatomic (C) Positively charged (D) Charged particles
  • A
    1-B, 2-D, 3-A, 4-C
  • B
    1-A, 2-C, 3-B, 4-D
  • C
    1-D, 2-A, 3-C, 4-B
    Correct
  • D
    1-C, 2-B, 3-D, 4-A
15
Match the following with correct response. (1) A dozen of pencil (2) Avogadro constant (3) Unit used for calculation of amount of chemical substances (4) Reference atom (A) Mole (B) 12(C) Carbon-12(D) \(6.022 \times {10^{23}}\)
  • A
    1-B, 2-D, 3-A, 4-C
    Correct
  • B
    1-A, 2-C, 3-B, 4-D
  • C
    1-D, 2-A, 3-C, 4-B
  • D
    1-C, 2-B, 3-D, 4-A