(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

Five atoms are labelled from A to E.

(a) Which one of these atoms:
(i) contains 7 protons,
(ii) has an electronic configuration 2, 7?
(b) Write down the formula of the compound formed between C and D.
(c) predict which are: (i) metals, (ii) non-metals?

The electronic configuration of an element T is 2, 8, 8, 1.

What is the group number of T?

The electronic configuration of an element T is 2, 8, 8, 1.

What is the period number of T?

Match the atomic number 4, 8, 14, 15 and 19 with each of the following:
(a) A solid non-metal of valelncy 3.
(b) A gas of valency 2.
(c) A metal of valency 1.
(d) A non-metal of valency 4

Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one forms an anion?

Give electron dot diagram of the following:
Magnesium chloride

Give electron dot diagram of the following:
nitrogen

Give electron dot diagram of the following:
methane

(i) How many atoms of each kind are present in the following molecules: calcium oxide, chlorine, water, carbon tetrachloride?
(ii) How many electrons are required for their octet structure?

Complete the following:

Name an alkali metal in period 3 and halogen in period 2.

Name the noble gas with 3 shells.

Write the probable colour of the following salt:

Ferrous salts

Write the probable colour of the following salt:

Ammonium salts

Write the probable colour of the following salt:

Cupric salts

Write the probable colour of the following salt:

Calcium salts

Write the probable colour of the following salt:

Aluminium Salts

Name a colourless cation not a representative element.

What is a ‘salt’?

Name a salts whose solubility increases with temperature.