ICSE ICSE Class 6 - CISCE Question Bank Solutions for Chemistry

Match the non-metallic elements – with their correct symbols. Non-metallic elements are:

Match the noble gases – with their correct symbols:

Give a reason why elements are tabulated in a table called the ‘Periodic table’.

Give the names and symbols of the first twenty elements of the periodic table.

Explain the terms ‘chemical formula’.

State what a chemical formula denotes.

Give the symbol and the number of atoms of the following elements present in sodium chloride.

Give the symbol and the number of atoms of the following elements present in water.

Give the symbol and the number of atoms of the following elements present in carbon dioxide.

Give the symbol and the number of atoms of the following elements present in zinc chloride.

For writing a chemical formula – ‘symbols’ and combining capacity of an element with hydrogen i.e. ‘valency’ should be known. Explain the term – combining the capacity of an element i.e. valency.

Match the symbols of metallic elements – with their correct combining power or capacity.

(a) K
(b) Zn
(c) Al
(d) Na
(e) Ca
Combining power or capacity – A : 3 ; B : 2 ; C : 1. (positive valencies)

Match the symbols of non-metallic elements with their correct combining power or capacity.

(a) O
(b) S
(c) Cl

Combining power or capacity A : 3; B : 2; C : 1. (negative valencies)

Match the symbols of – radicals – with their correct combining power or capacity, (valency).

(a) OH
(b) So₄
(c) No₃
(d) Co₃

Combining power or capacity – A : 3; B : 2; C : 1. (negative valencies)

Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.

K¹⁺ Cl^1-

Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.

Na¹⁺ Cl^1-

Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.

Ca²⁺ NO₃^1-

Match the formulas of the following gases with their correct names :

Gases - (a) H₂ (b) N₂ (c) O₂ (d) Cl₂ (e) HCI (f) NH₃ (g) CO (h) CO₂ (i) SO₂ (j) NO (k) NO₂.

Names:

(1) Ammonia (2) Nitrogen Dioxide (3) Oxygen (4) Hydrogen (5) Nitrogen (6) Chlorine (7) Carbon Monoxide (8) Sulphur Dioxide (9) Nitrogen Monoxide (10) Carbon Dioxide (11) Hydrogen Chloride

Match the formulas of the following of acids with their correct names:
Acids – (a) HCI (b) HNO₃ (c) H₂SO₄ (d) H₂CO₃
Names – (1) Carbonic acid (2) Sulphuric acid (3) Hydrochloric acid (4) Nitric acid

Match the formulas of the following of bases with their correct names.

Bases – (a) NaOH (b) KOH (c) Ca(OH)₂ (d) Zn(OH)₂

Names – (1) Potassium hydroxide (2) Zinc hydroxide (3) Aluminium hydroxide (4) Calcium hydroxide (5) Sodium hydroxide