B-form Sep Assessment 2025 Review

The element with no neutrons present in the nucleus.

• Hydrogen

• Helium

• Lithium

• Beryllium

Select the element which has a valency of zero.

• Fluorine

• Neon

• Sodium

• Magnesium

Identify the metal which has a valency of 2.

• Chlorine

• Argon

• Potassium

• Calcium

Isotopes are

• Two atoms of same element with different number of neutrons but same number of protons and electrons.

• Two atoms of same element with same number of neutrons but different number of protons and electrons.

• Two atoms of different element with different number of neutrons but same number of protons and electrons.

• Two atoms of different element with same number of neutrons but different number of protons and electrons.

K-shell is the shell

• farthest from the nucleus

• nearest to the nucleus

• outermost shell

• innermost shell in element K

A solid non-metal of valency 3

A gas of valency 2

A metal of valency 1

A non-metal of valency 4

Element X has electronic configuration 2, 8, 18, 8, 1. What will be ion produced by X? Also, will it be an oxidising agent or a reducing agent?

• X^-, reducing agent

• X^7-, oxidising agent

• X⁺, reducing agent

• X⁺⁷, oxidising agent