set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 4 EXERCISES
The following question based on acids, bases, salts and metals topic of general science mcq
- Washing soda
- Bleaching powder
- Baking soda
- Slaked lime
(a) (i), (ii) and (iv)
(b) (i) and (iii)
(c) (i) and (ii)
(d) (i), (iii) and (iv)
The correct answers to the above question in:
Answer: (b)
$NaCl + H_2O + CO_2 + NH_3 ⟶ NH_4Cl + {NaHCO_3} ↙\text"Baking soda"$
$2NaHCO_3 ⟶↖\text"heat" Na_2CO_3 + H_2O + CO_2$
$\text"Na_2CO_3"↙\text"Sodium carbonate" + 10 H_2O ⟶ {Na_2CO_3 10 H_2O} ↙\text"Hydrated sodium carbonate (washing soda)"$
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Question : 1
An unknown gas quickly dissolves in water. This gaseous aqueous solution turns red litmus into the blue. This gas produces hydrogen chloride with a white flame. This unknown gas is
a) Nitric hydroxide
b) Ammonia
c) Sulphur dioxide
d) Carbon monoxide
Answer »Answer: (b)
Question : 2
When vinegar reacts with baking soda the gas evolved is
a) oxygen
b) carbon dioxide
c) hydrogen
d) nitrogen dioxide
Answer »Answer: (b)
Vinegar is acetic acid and baking soda is sodium hydrogen carbonate (a base).
Whenever an acid reacts with a metal carbonate it produces carbon dioxide gas.
CH3COOH + NaHCO3 ⟶ CH3COONa + H2O + CO2
Question : 3
The acid in gastricjuice is
a) hydrochloric acid
b) acetic acid
c) nitric acid
d) sulphuric acid
Answer »Answer: (a)
Question : 4
Which of the following is a weak base ?
a) KOH
b) NH4OH
c) NaOH
d) none of these
Answer »Answer: (b)
NH4OH as it is not get completely ionized in aqueous solution.
Question : 5
Baking soda is
a) Sodium Dihydrogen Carbonate
b) Disodium Hydrogen Carbonate
c) Sodium Hydrogen Carbonate
d) Sodium Carbonate
Answer »Answer: (c)
Question : 6
Which of the following is ‘quicklime’ –
a) Ca(OH)2
b) CaCO3
c) CaO
d) CaCl2 .6H2O
Answer »Answer: (c)
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