Acids Bases And Salts

Chemistry
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Which one of the following can be used as an acid-base indicator by a visually impaired student?

A
Litmus
B
Turmeric
C
Vanilla essence
D
Petunia leaves
Medium
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Calcium phosphate is present in tooth enamel. Its nature is __________.

A
basic
B
acidic
C
neutral
D
amphoteric
Medium
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Sodium carbonate is a basic salt because it is a salt of:

A
strong acid and strong base
B
weak acid and weak base
C
strong acid and weak base
D
weak acid and strong base
Medium
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Which of the following is used for dissolution of gold?

A
Hydrochloric acid
B
Sulphuric acid
C
Nitric acid
D
Aqua regia
Medium
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If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

A
Wash the hand with saline solution
B
Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate
C
After washing with plenty of water, apply solution of sodium hydroxide on the hand
D
Neutralise the acid with a strong alkali
Medium
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Which of the following salts does not contain water of crystallisation?

A
Blue vitriol
B
Baking soda
C
Washing soda
D
Gypsum
Medium
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Identify the correct representation of reaction occurring during chloralkali process.

A
B
C
D
Medium
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In which of the following bleaching powder is not used?

A
For bleaching wood pulp
B
For water sterilisation
C
As an oxidising agent
D
For sugar decolourisation
Medium
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