MCQs 1 on STRUCTURE OF THE ATOM => 9th Class

solve online MCQs on Chemistry(STRUCTURE OF THE ATOM) => 9th Class for competitve examinations like CBSE Neet, CBSE Board, CSIR NET, GRE etc.

1. The charge/ mass ratio of electron:

• Depends on the nature of the electrodes
• Depends upon nature of the gas c. Remains constant
• Remains constant
• Depends on both nature of the gas and nature of the electrode

2. A student weighs 30kg. Suppose his body is entirely made of electrons. How any electrons are there in his body? Mass of an electron= 9.1X10-31kg

• 3.29 X10³¹
• 3.29 X10³⁰
• 3.29 X10²³
• 3.29 X10³²

3. Which of the following is correct?
A. Electrons = > i. Positive charge
B. Protons => ii. No charge
C. Neutrons => iii. Negative charge

• A-iii, B-ii, C-i
• A-iii, B-i, C-ii
• A-ii, B-iii, C-i
• A-ii, B-i, C-iii

4. Which of the following are positively charged ions:

• A and B
• C and D
• B and D
• D and F

5. If K, L, M, N shells of an atom are full, the total number of electrons in the atom are:

• 60
• 26
• 42
• 36

6. The electronic configuration of Cl(17) is:

• 2,8,7
• 2,2, 8,5
• 2,8,2,5
• 2,2,5,8

7. Composition of the nuclei of two atomic species are given:

The mass number of x and Y and their relation is

• 16,16; isotopes
• 17,15; isotopes
• 17,15; isotopes
• 16,16; 1sobars

8. Na⁺ has 12 neutrons and 10 electrons. Which of the following statements is correct?

• Na⁺ has atomic number 10 and mass number 22.
• Na⁺ has atomic number 11 and mass number 23.
• Na⁺ has atomic number 10 and mass number 23.
• Na⁺ has atomic number 11 and mass number 22.

9. Which of the following statement is correct about proton?

• It is the nucleus of deuterium
• It is an ionized hydrogen molecule
• It is an ionized Hydrogen atom
• It is an α particle with unit positive charge

10. The highest value of e/m ratio for anode rays is observed when the discharge tube is filled with:

• N₂
• H₂
• He
• Ar

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