Samacheer Kalvi 9th Science Chemistry Acids, Bases, Salts Questions - 1

Question: 1

Magnesium hydroxide is used as a medicine for

(A) Stomach disorder

(B) High fever

(C) Nervous disorder

(D) Headache

Question: 2

Hydrochloric acid is used as

(A) Food preservative

(B) Car battery

(C) Baking powder

(D) Cleansing agent in toilets

Question: 3

The acid present in an ant sting is

(A) Formic acid

(B) Malic acid

(C) Acetic acid

(D) Citric acid

Question: 4

Salts produce _____ ions when dissolved in water.

(A) Positive and negative

(B) Positive

(C) Negative

(D) None of these

Question: 5

When Hcl is added with a carbonate salt, it gives off _____ gas with brisk effervescence.

(A) CO

(B) CO₂

(C) SO₂

(D) NO₂

Question: 6

Distilled water cannot conduct electricity because it does not contain

(A) Atoms

(B) Charges

(C) Ions

(D) Molecules

Question: 7

Plaster of paris should be stored in a moisture proof container because _____

(A) It forms calcium

(B) It becomes vapour

(C) It does not absorb water

(D) It easily absorbs water and forms hard gypsum

Question: 8

Citrus fruits require _____ soil.

(A) Alkaline

(B) Acidic

(C) Slightly acidic

(D) Neutral

Question: 9

Bases have _____ taste.

(A) Sour

(B) Salty

(C) Sweet

(D) Bitter

Question: 10

The approximate pH range of lemon juice

(A) 2.0 – 3.0

(B) 2.2 – 2.4

(C) 2.5 – 3.5

(D) 3.0 – 3.5