Question

Classify the following as Direct combination, Displacement, Double Displacement, Double

Decomposition, Decomposition. (5)

1. Fe +CuSO 4-→ FeSO 4+Cu

2. 2Mg + O 2 -→ 2MgO

3. NaOH + HCl -→ NaCl + H 2 O

4. AgNO 3+ NaCl--→ AgCl + NaNO 3

5. FeS + H 2 SO 4→ FeSO 4+ H 2S​

Answer 1

Question :

Classify the following as direct combination, displacement, double displacement, double decomposition, decomposition reactions.

$~~~ \sf (1)~ Fe+CuSO_4\rightarrow FeSO_4+Cu$

$~~~ \sf (2)~2Mg+O_2\rightarrow 2MgO$

$~~~\sf (3) ~ NaOH+HCl\rightarrow NaCl+H_2O$

$~~~\sf (4)~ AgNO_3+NaCl\rightarrow AgCl+NaNO_3$

$~~~\sf (5) ~ FeS+H_2SO_4\rightarrow FeSO_4+H_2S$

Answer :

$~~~\sf (1)~ Fe + CuSO_4\rightarrow FeSO_4+Cu$

This is a displacement reaction because the metal iron displaces copper in copper sulphate.

$~~~\sf (2)~ 2Mg+O_2\rightarrow 2MgO$

This is a direct combination reaction because magnesium and oxygen here, directly combine to form magnesium oxide.

$~~~\sf (3) NaOH+H l\rightarrow NaCl+H_2O$

This is a double displacement reaction because sodium hydroxide and hydrochloride acid get displaced and sodium chloride, water are formed.

$~~~\sf (4)~ AgNO_3+NaCl\rightarrow AgCl+NaNO_3$

This is a double displacement reaction because silver nitrite and sodium chloride are displaced.

$~~~\sf (5)~ FeS+H_2SO_4\rightarrow FeSO_4+H_2S$

This is a double displacement reaction because iron sulphide and sulphuric acid get displaced.