Atoms And Molecules Test

Atoms And Molecules

This is Atoms and Molecules Test-02 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

Match the following with correct response. (1) Cobalt (2) Copper (3) Sulphur (4) Sodium (A) S (B) Co (C) Na (D) Cu

A
1-D, 2-A, 3-C, 4-B
B
1-C, 2-B, 3-D, 4-A
C
1-B, 2-D, 3-A, 4-C
Correct
D
1-A, 2-C, 3-B, 4-D

Match the following with correct response. (1) Instrument used to produce images of atoms (2) Atomic theory of matter (3) An allotrope of carbon (4) Potassium Sulphate (A) Compound (B) John Dalton (C) STM (D) Fullerene

A
1-C, 2-B, 3-D, 4-A
Correct
B
1-D, 2-A, 3-C, 4-B
C
1-B, 2-D, 3-A, 4-C
D
1-A, 2-C, 3-B, 4-D

What according to Dalton’s atomic theory is true among the following- A Atom is divisible into Protons, electrons and neutrons B Atoms of the same element have different atomic masses. C Atoms are the ultimate indivisible particle of matter D Atoms of same element have same atomic masses size and chemical properties

A
All of these
B
(c) and (d) are correct
Correct
C
(a) and (b) are correct
D
(a), (b) and (c) are correct

During a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is known as

A
Law of multiple proportion
B
Law of conservation of mass
Correct
C
None of these
D
Law of constant proportion

Statement A: Atoms can exist independently Statement B: The law of constant proportions is applicable only to pure chemical compounds. Which of the two Statements is true?

A
Statement B
Correct
B
Both the Statement A and B
C
Statement A
D
Neither Statement A nor Statement B

Which postulates of Dalton’s atomic theory is the basis of the law of conservation of mass?

A
Every matter is made up of small particles.
B
Atoms are smallest particles of matter.
C
All of these
D
Atoms can neither be created nor destroyed.
Correct

Match the following with correct response. (1) Smallest Particle ‘parmanu’ (2) Atoms are indivisible (3) Balanced chemical equation (4) Elements combined in fixed ratios (A) Dalton’s atomic theory (B) Law of constant Proportion (C) Law of conservation of mass (D) Maharshikannad

A
1-A, 2-C, 3-B, 4-D
B
1-B, 2-D, 3-A, 4-C
C
1-C, 2-B, 3-D, 4-A
D
1-D, 2-A, 3-C, 4-B
Correct

Which of the following is anion? A Magnesium B Sulphate C Oxalate D Ammonium

A
(a) and (b) are correct
B
All of these
C
(a), (b) and (c) are correct
D
(b) and (c) are correct
Correct

What is the ratio of magnesium and Sulphur by mass in Magnesium sulphide?

A
23:35.5
B
2:1
C
3:4
Correct
D
5:2

Calculate the formula unit mass of\({\text{Znc}}{{\text{l}}_{\text{2}}}\)?

A
136 u
Correct
B
111 u
C
144 u
D
123 u

“Gram atomic mass of an element and the gram molecular mass of a compound contains the same number of molecules” is a

A
True statement
Correct
B
Partially false statement
C
Partially true statement
D
False statement

Statement A: X – rays are electromagnetic waves of very short wavelength. Statement B: The maximum number of electrons that can be accommodated in L shell are 8 Which of the two statements is true?

A
Both the statement A and B
Correct
B
Statement A
C
Neither statement A nor statement B.
D
Statement B

Sample of water from a well was analyzed. What will be the ratio of hydrogen and oxygen in it by mass?

A
1:8
B
2:16
C
both a and c
Correct
D
8:1

Identify incorrect statement

A
None of these
Correct
B
Atoms have been found to be made up of sub atomic particles.
C
Atoms of different elements may have same masses.
D
Atoms of the same element may have different masses

Statement A: Atomic mass of an element is not its actual mass but relative mass. Statement B: With the help of STM it is possible to take the photograph of some atoms. Which of the two statements is true?

A
Statement B
B
Both a and b
Correct
C
Neither a nor b
D
Statement A