set 1 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) by adding sulphuric acid to calcium hydroxide
(b) by heating gypsum to a very high temperature
(c) by adding water to calcium sulphate
(d) by heating gypsum to 373 K.
The correct answers to the above question in:
Answer: (d)
$CaSO_4.{2H_2O} ⟶↖Δ CaSO_4 . 1/2H_2O + 3/2H_2O$
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Question : 1
With reference to ionic compounds, consider the following statements.
- Ionic compounds are insoluble in alcohol.
- Ionic compounds in the solid state are a good conductor of electricity.
a) Only 2
b) Both 1 and 2
c) Only 1
d) Neither 1 nor 2
Answer »Answer: (c)
Question : 2
Assertion (A):
To dilute sulphuric acid, acid is added to water and not water to acid.
Reason (R):
Specific heat of water is very high.
a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
b) (A) is true, but (R) is false
c) Both (A) and (R) are true and (R) is the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (c)
Question : 3
Match Column-I with Column-II:
Column-I | Column-II |
A. Hardest Non-metal | 1. Graphite |
B. Non-metal conducts electricity | 2. Sulphur |
C. Non-metal with lustre | 3. Diamond (Carbon) |
D. Non-metal used as fungicide | 4. Iodine |
a) A – P; B – R; C – S; D – Q
b) A – R; B – P; C – S; D – Q
c) A – Q; B – P; C – S; D – R
d) A – R; B – P; C – Q; D – S
Answer »Answer: (b)
Question : 4
Which of the following is considered a mineral acid ?
a) Lactic acid
b) Citric acid
c) Oxalic acid
d) Phosphoric acid
Answer »Answer: (d)
Question : 5
Which method is employed for obtaining a pure metal?
a) Magnetic separation
b) Froth floatation
c) Electrolytic refining
d) Gravity separation
Answer »Answer: (c)
Question : 6
The chemical formula of baking soda is
a) $NaHCO_3$
b) $CaCO_3$
c) $Ca(OH)_2$
d) $Na_2CO_3$
Answer »Answer: (a)
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