Online test of Chapter 3 Atoms and Molecules 1 Science| Class 9th
Questions:
1. The formula of a chloride of a metal M is MCl3, the formula of the phosphate of metal M will be
(a) MPO4
(b) M2PO4
(c) M3PO4
(d) M2(PO4)3
2. The ratio of H:O by mass in hydrogen peroxide (H2O2) is
(a) 16 : 1
(b) 1 : 8
(c) 1 : 32
(d) 1 : 16
3. Which has the largest number of molecules?
(a) 54 g of N2O5
(b) 28 g of CO2
(c) 36 g of H2O
(d) 46 g of C2H5OH
4. The molecular formula of zinc phosphate is
(a) Zn(PO4)3
(b) Zn2PO4
(c) Zn3(PO4)2
(d) ZnPO4
5. The accepted unit of atomic mass and molecular mass is
(a) amu
(b) g
(c) kg
(d) g mol-1
6. Valence of noble gases is
(a) 1
(b) 0
(c) 2
(d) none of these
7. The number of atoms of hydrogen present In 1 mole of ethyne (C2H2) is
(a) 4 x 6.023 x 1023
(b) 2 x 6.023 x 1023
(c) 6.023 x 1023
(d) 8 x 6.023 x 1023
8. The law of definite proportions was proposed by
(a) John Dalton
(b) Richter
(c) Joseph Proust
(d) A. Lavoisier
9. The reference standard used for defining atomic mass unit is
(a) H
(b) C-12
(c) C-13
(d) C-14
10. The element whose gram-atomic mass and gram-molecular mass are the same is
(a) argon.
(b) nitrogen.
(c) oxygen.
(d) hydrogen.
Chapter 3 Atoms and Molecules Quiz 1| Class 9th
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Question 1 of 10
1. Question
The formula of a chloride of a metal M is MCl3, the formula of the phosphate of metal M will be
Correct
Valence of M in MCl3 = 3+
Valence of PO4 = 3-
Therefore, it will form MPO4Incorrect
Valence of M in MCl3 = 3+
Valence of PO4 = 3-
Therefore, it will form MPO4 -
Question 2 of 10
2. Question
The ratio of H:O by mass in hydrogen peroxide (H2O2) is
Correct
Mass of hydrogen (H) = 2u and Mass of oxygen (O) = 32 u
Ratio of H:O = 2/32 = 1/16 = 1:16Incorrect
Mass of hydrogen (H) = 2u and Mass of oxygen (O) = 32 u
Ratio of H:O = 2/32 = 1/16 = 1:16 -
Question 3 of 10
3. Question
Which has the largest number of molecules?
Correct
To calculate no. of molecules, first calculate the mass of 1 molecule. After that, divide the given mass by mass of 1 molecule.
For example, Mass of 1 molecule of H2O = 18g
Therefore, No. of molecules in 36 g of H2O = 36/18 = 2Incorrect
To calculate no. of molecules, first calculate the mass of 1 molecule. After that, divide the given mass by mass of 1 molecule.
For example, Mass of 1 molecule of H2O = 18g
Therefore, No. of molecules in 36 g of H2O = 36/18 = 2 -
Question 4 of 10
4. Question
The molecular formula of zinc phosphate is
Correct
Valence of Zn = 2+
Valence of PO4 = 3-
Molecular formula of zinc phosphate = Zn3(PO4)2Incorrect
Valence of Zn = 2+
Valence of PO4 = 3-
Molecular formula of zinc phosphate = Zn3(PO4)2 -
Question 5 of 10
5. Question
The accepted unit of atomic mass and molecular mass is
Correct
amu (atomic mass unit) is accepted unit of atomic mass and molecular mass.
Incorrect
amu (atomic mass unit) is accepted unit of atomic mass and molecular mass.
-
Question 6 of 10
6. Question
Valence of noble gases is
Correct
Noble gases always complete its duplet or octet. Thus, its valency is 0.
Incorrect
Noble gases always complete its duplet or octet. Thus, its valency is 0.
-
Question 7 of 10
7. Question
The number of atoms of hydrogen present In 1 mole of ethyne (C2H2) is
Correct
No. of molecules in 1 mole C2H2 = 6.023 x 1023
No. of atoms of H in ethyne = 2
No. of atoms of hydrogen present In 1 mole of C2H2 = 2 x 6.023 x 1023Incorrect
No. of molecules in 1 mole C2H2 = 6.023 x 1023
No. of atoms of H in ethyne = 2
No. of atoms of hydrogen present In 1 mole of C2H2 = 2 x 6.023 x 1023 -
Question 8 of 10
8. Question
The law of definite proportions was proposed by
Correct
Incorrect
-
Question 9 of 10
9. Question
The reference standard used for defining atomic mass unit is
Correct
atomic mass unit used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.
Incorrect
atomic mass unit used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.
-
Question 10 of 10
10. Question
The element whose gram-atomic mass and gram-molecular mass are the same is
Correct
Argon is a noble gas which exist as monoatomic molecule. It also complete its octet therefore its molecular mass and atomic mass is same.
Incorrect
Argon is a noble gas which exist as monoatomic molecule. It also complete its octet therefore its molecular mass and atomic mass is same.