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
(a) < 7
(b) 7
(c) > 7 but not 14
(d) 14
The correct answers to the above question in:
Answer: (a)
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Question : 1
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 : 2
Which of the following statement is true?
a) Bases are sour in taste
b) The reaction between acid and a base is exothermic reaction
c) Acids are bitter in taste
d) The reaction between an acid and a base is endothermic reaction.
Answer »Answer: (b)
This reaction is exothermic.
i.e. Heat is evolved HCl + NaOH ⟶ NaCl + H2O + Heat
Question : 3
Washing soda has the formula –
a) Na2CO3 .10H2O
b) Na2CO3 .H2O
c) Na2CO3 .7H2O
d) Na2
Answer »Answer: (a)
Question : 4
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)
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