Chemical Equation and Reaction

Which of the following is not a physical change?

• Boiling of water to give water vapour

• Melting of ice to give water

• Dissolution of salt in water

• Combustion of Liquefied Petroleum Gas (LPG)

The following reaction is an example of a

4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

(i) displacement reaction

(ii) combination reaction

(iii) redox reaction

(iv) neutralisation reaction

• (i) and (iv)

• (ii) and (iii)

• (i) and (iii)

• (iii) and (iv)

Which of the following statements about the given reaction are correct?

3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g)

(i) Iron metal is getting oxidised

(ii) Water is getting reduced

(iii) Water is acting as reducing agent

(iv) Water is acting as oxidising agent

• (a) (i), (ii) and (iii)

• (b) (iii) and (iv)

• (c) (i), (ii) and (iv)

• (d) (ii) and (iv)

Which of the following is lead nitrate?

• PbNO₃

• (PbNO₃)₂

• Pb₂NO₃

• Pb(NO₃)₂

When we heat lead nitrate, a brown coloured gas is produced. The chemical formula of this gas is:

• NO₃

• PbO

• NO₂

• O₂

What type of reaction is the picture showing here?

• Combination reaction

• Decomposition Reaction

• Displacement Reaction

• Double displacement reaction

Which of the following is a precipitation reaction?

• Reaction between Zn and CuSO₄

• Reaction between Carbon and O₂

• Reaction between sodium sulphate and Barium Chloride

• Heating of lead nitrate

In this picture, sodium sulphate is being added to barium chloride. Name the precipitate that is formed in this reaction.

• Na₂SO₄

• BaCl₂

• BaSO₄

• NaCl

In this picture, sodium sulphate is being added to barium chloride. Name the colour of the precipitate that is formed in this reaction.

• Yellow

• Black

• White

• Red

Oxidation is process in which a substance _______ oxygen or ______ hydrogen during a chemical reaction.

• loses, gains

• gains, loses

• gains, gains

• loses, loses