(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

Give the orbital diagram of the following:

Methane

Give the orbital diagram of the following:

Hydrogen chloride

State the type of bonding in the following molecules.

Water,

State the type of bonding in the following molecules.

Calcium oxide

State the type of bonding in the following molecules.

Hydrogen chloride 

Element M forms a chloride with the formula MCl₂ which is solid with a high melting point. What type of bond is in MCl₂. Write the formula of the compound when M combines with sulphur, oxygen, and nitrogen.

Explain the following:

Carbon-12 and carbon-14 both show similar chemical properties. 

Identify the following reaction as either oxidation or reduction:

O + 2e^- → O^2-

Identify the following reaction as either oxidation or reduction:

K - e^- → K⁺

Identify the following reaction as either oxidation or reduction:

Fe³⁺ + e^- → Fe²⁺

Identify the following reaction as either oxidation or reduction:

Zn → Zn²⁺ + 2e- 

In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidized and the substance that is reduced. 

What is the need for classification of elements?

What was the basis of the earliest attempts made for classification and grouping of elements?

Compare hydrogen with alkali metals on the basis of:

Reducing power

Compare hydrogen with alkali metals on the basis of:

Reaction with oxygen