Acids Bases and Salts Class 7 Extra Questions and Answers. We covered all the Acids Bases and Salts Class 7 Extra Questions and Answers in this post for free so that you can practice well for the exam.
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Acids Bases and Salts Class 7 Extra Objective Questions and Answers for Students
Which one of the following salt is predominant in the ocean?
(A) Calcium Carbonate
(B) Sodium Chloride
(C) Potassium Chloride
(D) Magnesium Sulphate
Option b – Sodium Chloride
Table salt (NaCl) is a product of
(B) Strong acid and strong base
(D) Strong acid and weak basic
Which one of the following is viscous?
(A) Alcohol
(B) Water
(C) Honey
(D) Gasoline
Option c – Honey
Which one of the following statements is not correct?
(A) The presence of NaCl increases the rate of setting of Plaster of Paris
(B) Gypsum is added to the cement to slow down its rate of setting
(C) All alkaline earth metals form hydrated salts
(D) Barium and Strontium are found free in nature
Option d – Barium and Strontium are found free in nature
What is for bleaching untrue powder?
(A) It is more soluble than water
(B) It is a powder of light yellow colour
(C) It is the oxidant
(D) It releases chlorine after reaction with dilute acid
Option a – It is more soluble than water
A solution turns red litmus blue. The pH of the solution is
(A) 7
(B) 1
(C) 5
(D) None of these
Option d – None of these
Which acid is considered a basic chemical in Industry?
(A) H₂CO3
(B) HNO3
(C) H₂SO4
(D) HCI
Option c – H₂SO4
Goldsmiths use aqua regia, which is prepared by mixing
(A) Nitric acid and Sulphuric acid
(B) Nitric acid and Hydrochloric acid
(C) Sulphuric acid and Hydrochloric acid
(D) Citric acid and Benzoic acid
Option b – Nitric acid and Hydrochloric acid
pH value shows the Numeric value of
(A) the Quality of the chemical used for developing photographic negatives
(B) Analysing the nature of the solution acidic or basic
(C) Analysing the intensity of an earthquake
(D) Analysing for checking the purity of milk
Option b – Analysing the nature of the solution acidic or basic
Which of the following is present in the maximum amount of acid rain?
(A) HCI
(B) HNO3
(C) H₂SO4
(D) H₂CO3
Option c – H₂SO4
An aqueous solution of copper sulphate is acidic in nature because the salt undergoes.
(A) Dialysis
(B) Electrolysis
(C) Hydrolysis
(D) Photolysis
Option c – Hydrolysis
Which is not a Lewis acid?
(A) AICI3
(B) BF3
(C) NH3
(D) FeCl3
Option c – NH3
Sodawater obtained by passing carbon dioxide in water is
(A) An oxidising agent
(B) Basic in nature
(C) Acidic in nature
(D) A reducing agent
Option c – Acidic in nature
Which of the following acid do not contain Oxygen?
(A) Nitric Acid
(B) Sulphuric Acid
(C) Hydrochloric Acid
(D) All of the above
Option c – Hydrochloric Acid
What is Neela Thotha?
(A) Copper Sulphate
(B) Calcium Sulphate
(C) Iron Sulphate
(D) Sodium Sulphate
Option a – Copper Sulphate
An unknown gas quickly dissolves in water. This gaseous aqueous solution turns red litmus into blue. This gas produces hydrogen chloride with a white flame. This unknown gas is
(A) Sulphur dioxide
(B) Nitric hydroxide
(C) Ammonia
(D) Carbon monoxide
Option c – Ammonia
Baking soda is
(A) Sodium Hydrogen Carbonate
(B) Sodium Dihydrogen Carbonate
(C) Disodium Hydrogen Carbonate
(D) Sodium Carbonate
Option a – Sodium Hydrogen Carbonate
The chemical formula of baking soda is
(A) Ca(OH)₂
(B) NaHCO3
(C) CaCO3
(D) Na₂CO3
Option b – NaHCO3
The chemical formula of washing soda is
(A) NaOH
(B) Na₂CO3
(C) NaHCO3
(D) Ca(OH)2
Option b – Na₂CO3
Antacids are
(A) Base
(B) Acid
(C) Salt
(D) Buffer
Option a – Base
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