set 3 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
(a) Impurities collected at anode in electrolysis during purification of metals
(b) Fan of anode
(c) Metal of anode
(d) All of these
The correct answers to the above question in:
Answer: (a)
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Question : 1
‘Alum’ is an example of –
a) double salt
b) acids
c) single salt
d) none of these
Answer »Answer: (a)
$K_2SO_4 + Al_2(SO_4)_3 .24H_2O$ ⟶ Alum
Question : 2
Bleaching powder is soluble in cold water giving a milky solution due to –
a) lime present in it
b) calcium carbonate formation
c) available chlorine
d) the absorption of carbon dioxide from atmosphere
Answer »Answer: (a)
Bleaching powder is actually a mixture of calcium hypochlorite CaOCl2 and the basic chloride CaCl2 with some slaked, Ca(OH)2 .
Question : 3
Plaster of paris is obtained –
a) by heating gypsum to a very high temperature
b) by adding water to calcium sulphate
c) by adding sulphuric acid to calcium hydroxide
d) by heating gypsum to 373 K.
Answer »Answer: (d)
Question : 4
Match List I with List II and select the correct answer using the codes given below the lists:
List-I | List-II |
A. Blue vitriol | 1. Sodium bicarbonate |
B. Epsom salt | 2. Sodium hydroxide |
C. Baking soda | 3. Magnesium sulphate |
D. Caustic soda | 4. Copper sulphate |
a) A-3; B-4; C-1; D-2
b) A-3; B-4; C-2; D-1
c) A-4; B-3; C-2; D-1
d) A-4; B-3; C-1; D-2
Answer »Answer: (d)
Question : 5
Which of the following statements regarding oxidation and reduction are correct?
- In oxidation, loss of electron takes place whereas in reduction, gain of electron takes place.
- In oxidation, gain of electron takes place whereas in reduction, loss of electron takes place.
- Oxidizing agent decreases the oxidation number but reducing agent increases the oxidation number.
- Oxidizing agent increases the oxidation number but reducing agent reduces the oxidation number.
a) 2 and 3
b) 1 and 3
c) 2 and 4
d) 1 and 4
Answer »Answer: (d)
Question : 6
Which of the following acid do not contain Oxygen?
a) Sulphuric Acid
b) Hydrochloric Acid
c) Nitric Acid
d) All of the above
Answer »Answer: (b)
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