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Question-1
Acidity of ammonium hydroxide is -

(A) 1	(B) 2
(C) 4	(D) 3

Question-2
Litmus solution is a purple dye, which is extracted from

(A) Bacteria	(B) Fungus
(C) Lichen	(D) Sea-plants

Question-3
The substance which indicates the presence of acid or base by change of its smell is known as :

(A) household indicator	(B) acid-base indicator
(C) olfactory indicator	(D) none of these

Question-4
A house wife found that the bread prepared by her is hard and small in size, which ingredient has she forgotten to add?

(A) Na₂CO₃	(B) NaOH
(C) NaHCO₃	(D) Na₂O

Question-5
Acids react with sodium carbonate or bicarbonate to give ____________ gas .

(A) H₂	(B) O₂
(C) CO₂	(D) CO

Question-6
Sodium sulphate is

(A) An acid	(B) A base
(C) An alkali	(D) A salt

Question-7
An acid used in the manufacture of glass is:

(A) ascorbic acid	(B) boric acid
(C) phosphoric acid	(D) tartaric acid

Question-8
Which is used in soda-acid fire extinguisher?

(A) Sodium hydroxide	(B) Sodium hydrogen carbonate
(C) Potassium hydroxide	(D) Calcium hydroxide

Question-9
Metals react with dilute acids to give metal salts and

(A) Water	(B) Oxygen
(C) CO₂	(D) H₂

Question-10
What happens when a CO₂ fire extinguisher cylinder is inverted and the stopper is opened by pushing the plunger ?

(A) An explosion takes place	(B) CO₂ will comes out
(C) Water comes out	(D) Nothing will happen

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Std 10

CBSE

Practice in Related Chapters
Acids, Bases and Salts
Metals and Non-metals
Periodic Classification of Elements
Carbon and its Compounds
Chemical Reactions and Equations