In solid state $NaCl$ does not conduct electricity but in molten state and in aqueous solution it conducts electricity. Give separate reasons for each observation.

Important Questions on Metals and Nonmetals

MEDIUM

10th CBSE

IMPORTANT

Secondary Chemistry Class X>Chapter 3 - Metals and Nonmetals>SUMMATIVE ASSESSMENT QUESTIONS (As Per the Guidelines of the CBSE on CCE)>Q 27

Describe the ionic bonding between potassium (atomic number

= 19

) and oxygen (atomic number

= 8

) in terms of electron transfer. Name the force which operates between

K^{+}

and

{Cl}^{-}

ions in solid

KCl

.

MEDIUM

10th CBSE

IMPORTANT

Secondary Chemistry Class X>Chapter 3 - Metals and Nonmetals>SUMMATIVE ASSESSMENT QUESTIONS (As Per the Guidelines of the CBSE on CCE)>Q 28

An ionic compound

{AB}_{2}

is formed between a metal and a nonmetal. Write two important physical properties of this compound.

HARD

10th CBSE

IMPORTANT

Secondary Chemistry Class X>Chapter 3 - Metals and Nonmetals>SUMMATIVE ASSESSMENT QUESTIONS (As Per the Guidelines of the CBSE on CCE)>Q 29

Nonmetal A, a major gaseous component of air, combines with $H_{2}$ in the mole ratio $1 : 3$ in the presence of iron catalyst to give a gas B which is highly soluble in water. Gas A forms a reddish brown oxide C, When C is dissolved in water in the presence of air an acid D is formed which is a strong oxidizing agent.

(i) Identify A, B, C and D
(ii) What is the nature of the aqueous solution of gas B?
(iii) To which group and period of the period table does the nonmetal A belong?

HARD

10th CBSE

IMPORTANT

Secondary Chemistry Class X>Chapter 3 - Metals and Nonmetals>SUMMATIVE ASSESSMENT QUESTIONS (As Per the Guidelines of the CBSE on CCE)>Q 30

Describe the following
Roasting of