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) Na2CO3
(b) NaHCO3
(c) NaOH
(d) Ca(OH)2
The correct answers to the above question in:
Answer: (a)
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Read more chemistry ncert Based General Science Questions and Answers
Question : 1
To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is
a) neutral
b) basic
c) acidic
d) corrosive
Answer »Answer: (b)
Question : 2
pH value shows the Numeric value of
a) Analysing the nature of solution acidic or basic
b) Analysing the intensity of an earthquake
c) Quality of chemical used for developing photographic negatives
d) Analysing for checking purity of milk
Answer »Answer: (a)
Question : 3
Which of the following statement regarding bases is false?
a) Bases are soapy to touch
b) Bases are extremly corrosive in nature
c) Bases produce hydroxide ions when dissolved in water
d) Basic solutions are non conducting in nature
Answer »Answer: (d)
Basic solutions are conducting in nature. Conduction depends on the number of hydroxide ions produced when dissolved in water.
Question : 4
Which one of the following salts when dissolved in water makes the solution basic?
a) Ferric chloride
b) Sodium chloride
c) Copper sulphate
d) Sodium acetate
Answer »Answer: (d)
Question : 5
The chemical name of bleaching powder is
a) calcium oxychloride
b) calcium chloroxide
c) calcium chloride
d) none of above
Answer »Answer: (a)
Question : 6
Plaster of Paris hardens by –
a) changing into CaCO3
b) combining with water
c) giving of CO2
d) giving out water
Answer »Answer: (b)
$CaSO_4.{1/2}H_2O+3/2H_2O ⟶ {CaSO_4}.2H_2O$
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