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) 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.
The correct answers to the above question in:
Answer: (b)
This reaction is exothermic.
i.e. Heat is evolved HCl + NaOH ⟶ NaCl + H2O + Heat
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Question : 1
Washing soda has the formula –
a) Na2CO3 .10H2O
b) Na2CO3 .H2O
c) Na2CO3 .7H2O
d) Na2
Answer »Answer: (a)
Question : 2
Acid rain is caused due to _____________ .
a) CO2 , NO2 , H2
b) SO2 N2 , O2
c) CO2 , O2 , SO2
d) CO2 , SO2 , NO2
Answer »Answer: (d)
Acid rain is caused due to increased pollution in the air.
The poisonous gases like sulphur dioxide, carbon dioxide and nitrogen dioxide react with water to form sulphuric acid, carbonic acid and nitric acid respectively.
Question : 3
Which of the following is ‘quicklime’ –
a) Ca(OH)2
b) CaCO3
c) CaO
d) CaCl2 .6H2O
Answer »Answer: (c)
Question : 4
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 : 5
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 : 6
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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