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Acid Base and Salt mcq. We covered all the Acid Base and Salt mcq in this post for free so that you can practice well for the exam.
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mcq on Acid Base and Salt for Students
What is referred to as Jeweller’s rouge?
a) Ferric oxide
b) Ferrous oxide
c) Ferrous carbonate
d) Ferric carbonate
Option a – Ferric oxide
How does plaster of Paris harden?
a) Through loss of water
b) By reacting with oxygen in the air
c) Through absorption of water, forming a new hydrate
d) By combining with carbon dioxide from the air
Option c – Through absorption of water, forming a new hydrate
Which compound is commonly used as a mordant in dyeing and tanning?
a) Magnesium oxide
b) Magnesium carbonate
c) Magnesium chloride
d) Magnesium sulphate
Option d – Magnesium sulphate
What chemical should be used to clean gold jewellery?
a) Aqua regia
b) Concentrated sulfuric Acid
c) Concentrated sodium hydroxide
d) Sodium thiosulphate solution
Option a – Aqua regia
What is the purpose of sodium thiosulphate in photography?
a) To eliminate reduced silver
b) To reduce silver bromide to metallic silver
c) To remove unreacted silver bromide by forming a soluble complex
d) To convert silver back to its Salt form
Option c – To remove unreacted silver bromide by forming a soluble complex
A bottle releases a vinegar-like smell when opened. What is the likely chemical inside?
a) Hydrochloric Acid
b) Sodium hydroxide
c) Acetic Acid
d) A saturated solution of sodium bicarbonate
Option c – Acetic Acid
What happens to pH paper when tested with distilled water and then with a saltwater solution?
a) Green
b) Yellow
c) Red
d) Blue
Option a – Green
A liquid turns pH paper blue. What is the likely substance?
a) Lemon juice
b) Hydrochloric Acid
c) Sodium bicarbonate
d) Acetic Acid
Option c – Sodium bicarbonate
Which of the following is not necessary to test the pH of a substance?
a) pH paper
b) Litmus paper
c) Universal indicator
d) pH colour chart
Option b – Litmus paper
Dogs track humans using which compound found in foot sweat?
a) Carboxylic Acids
b) Uric Acid
c) Glucose
d) Sodium chloride
Option a – Carboxylic Acids
What is the primary component of a pearl?
a) Calcium and magnesium carbonates
b) Calcium sulfate
c) Calcium oxide and calcium sulfate
d) Calcium carbonate
Option d – Calcium carbonate
Some soft drinks are labeled as acidity regulators. What do they contain to achieve this?
a) Carbon dioxide
b) Bicarbonate compounds
c) Both a and b
d) Carbon dioxide and lime
Option b – Bicarbonate compounds
What is iodised Salt?
a) A mixture of potassium iodide and table Salt
b) A blend of iodine and table Salt
c) A compound formed by potassium iodide and common Salt
d) A combination of iodine molecules and sodium chloride
Option a – A mixture of potassium iodide and table Salt
Why is gypsum added to clinker during cement production?
a) To slow down the setting of cement
b) To help bind calcium silicate
c) To form a colloidal gel
d) To strengthen the final product
Option a – To slow down the setting of cement
To make pure water conductive, which of the following should be added?
a) Kerosene
b) Mustard oil
c) Lemon juice
d) Sugar
Option c – Lemon juice
Which of these is a tribasic acid?
a) Hydrochloric acid
b) Nitric acid
c) Sulphuric acid
d) Phosphoric acid
Option d – Phosphoric acid
Which solution has a pH value below 7?
a) Sodium hydroxide
b) Potassium chloride
c) Ferric chloride
d) Sodium chloride
Option c – Ferric chloride
Which gas forms an acidic solution when dissolved in water?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
Option a – Carbon dioxide
Identify the compound that is an alkali
a) Calcium hydroxide
b) Potassium hydroxide
c) Magnesium hydroxide
d) Calcium carbonate
Option b – Potassium hydroxide
Which compound produces a basic solution in hydrofluoric acid?
a) Arsenic pentafluoride
b) Phosphorus pentafluoride
c) Boron trifluoride
d) Bromine trifluoride
Option d – Bromine trifluoride
Which Salts do not dissolve well in water?
a) Iron and manganese chlorides
b) Silver and lead nitrates
c) Lead and copper carbonates
d) Sodium and ammonium phosphates
Option c – Lead and copper carbonates
If gallium and oxygen form Ga₂O₃, what is the valency of gallium?
a) 1
b) 2
c) 3
d) 4
Option c – 3
Which of the following statements about the pH scale are true? I. It uses a logarithmic scale II. The range is from 0–14 due to water’s ion product III. Lower values indicate stronger acidity
a) I and II
b) I, II and III
c) I and III
d) II only
Option b – I, II and III
Why does neutral water turn slightly acidic after aeration?
a) Because dissolved oxygen makes it acidic
b) Because it mixes with dirt, becoming acidic
c) Due to UV Light splitting water molecules
d) Because it absorbs carbon dioxide from the air
Option a – Because dissolved oxygen makes it acidic
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