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) calcination
(b) crushing and grinding
(c) concentration of ore
(d) roasting
The correct answers to the above question in:
Answer: (c)
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Question : 1
Bases turn red litmus blue and acids turn blue litmus red. A student tested a liquid with a red litmus paper and it stayed red with no change. This shows that the liquid
a) is not a base
b) must be pure water
c) must be an acid
d) is neither a base nor an acid
Answer »Answer: (b)
Question : 2
The concentration of hydrochloric acid in a given solution is 10–8 M. What is the value of pH for this solution ?
a) < 7
b) 7
c) > 7 but not 14
d) 14
Answer »Answer: (a)
Question : 3
Which of the following compounds is basic in nature ?
a) CaCl2 .6H2O
b) NaCl
c) Ca(OH)2
d) CuSO4 .5H2O
Answer »Answer: (c)
Question : 4
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 : 5
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 : 6
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)
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