set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on inorganic chemistry topic of general science mcq
(a) Hydrogen
(b) Nitrogen
(c) Oxygen
(d) Carbon
The correct answers to the above question in:
Answer: (a)
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Question : 1
Select the correct statements:
- Plants use CO2 during the process of photosynthesis
- CO2 dissolved in water reacts with limestone present in rocks to form A which is absorbed by marine animals. Compound A helps in the formation of shells by marine animals.
- The % of oxygen in the air dissolved in water is about 32- 35%.
- Aquatic animals use dissolved oxygen to respire.
a) 1, 3 and 4
b) 2 and 4
c) 1, 2 and 3
d) 1, 2, 3 and 4
Answer »Answer: (d)
Question : 2
Which of the statements given below is/are correct?
The permanent hardness of water is due to the presence of soluble.
- chloride of calcium
- bicarbonate of calcium
- sulphate of magnesium
- bicarbonate of magnesium
a) 2 and 4
b) 1 and 3
c) 1 only
d) 1, 2 and 3
Answer »Answer: (b)
Chlorides and sulphates of calcium and magnesium are responsible for the permanent hardness of the water.
Note: Bicarbonates are responsible for the temporary hardness of the water.
Question : 3
The chemical composition of diamond is
a) Carbon
b) Nickel
c) Nitrogen
d) Zinc
Answer »Answer: (a)
Question : 4
While tinning of brass utensils, the ammonium chloride powder used to clean the hot utensil produces fumes of
a) hydrochloric acid
b) carbon monoxide
c) ammonia
d) ammonia and hydrochloric acid
Answer »Answer: (d)
It produces fumes of ammonia and hydrochloric acid.
Question : 5
Food cans are coated with tin and not with zinc because
a) zinc is more reactive than tin
b) zinc has a higher melting point than tin
c) zinc is costlier than tin
d) zinc is less reactive than tin
Answer »Answer: (a)
Question : 6
Consider the following statements :
- Among the nitrogenous fertilizers used, urea contains maximum percentage of N.
- The mixture of calcium sulphate and calcium dihydrogen phosphate is known as superphosphate of lime.
- Potassium magnesium sulphate is called the muriate of potash.
a) 1 and 3
b) 2 and 3
c) 1 and 2
d) 1, 2 and 3
Answer »Answer: (c)
Statement (1) and (2) are correct. Urea contains maximum percentage of N among various fertilizers used. The mixture of Ca(H2PO4) 2 and CaSO4 is sold as “super phosphate”. Statement (3) is wrong. Muriate is name for potassium chloride KCl.
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