Free NCERT Solutions, Notes & MCQs for Class 9–12

Acids, Bases and Salts - True/False

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Q 01 / 25

All acids turn blue litmus red.

✔ True ✘ False

Q 02 / 25

Bases are bitter in taste and feel soapy to touch.

✔ True ✘ False

Q 03 / 25

Common salt is a neutral salt.

✔ True ✘ False

Q 04 / 25

Hydrochloric acid is present in the human stomach.

✔ True ✘ False

Q 05 / 25

Sodium hydroxide is an acid.

✔ True ✘ False

Q 06 / 25

All acids are corrosive in nature and dangerous to handle.

✔ True ✘ False

Q 07 / 25

Baking soda is used for making cakes and is a base.

✔ True ✘ False

Q 08 / 25

The pH value of a neutral solution is always 7.

✔ True ✘ False

Q 09 / 25

Phenolphthalein remains colourless in acidic and turns pink in basic solutions.

✔ True ✘ False

Q 10 / 25

Acetic acid is a strong acid.

✔ True ✘ False

Q 11 / 25

Calcium oxide reacts with water to form calcium hydroxide (slaked lime).

✔ True ✘ False

Q 12 / 25

Lemon juice contains citric acid which is responsible for its sour taste.

✔ True ✘ False

Q 13 / 25

The chemical formula of common salt is \(\mathrm{Na_2SO_4}\).

✔ True ✘ False

Q 14 / 25

Acids react with metals to evolve hydrogen gas.

✔ True ✘ False

Q 15 / 25

Tooth decay is caused when the pH inside the mouth falls below 5.5.

✔ True ✘ False

Q 16 / 25

Soluble bases are called acids.

✔ True ✘ False

Q 17 / 25

Blue litmus remains blue in basic solution.

✔ True ✘ False

Q 18 / 25

Non-metallic oxides are generally acidic in nature.

✔ True ✘ False

Q 19 / 25

The formula of Plaster of Paris is \(\mathrm{CaSO_4.\frac{1}{2}H_2O}\).

✔ True ✘ False

Q 20 / 25

The pH of a strongly basic solution is less than 7.

✔ True ✘ False

Q 21 / 25

Washing with plenty of water and applying baking soda is recommended for acid spills on skin.

✔ True ✘ False

Q 22 / 25

Vinegar smells like acetic acid.

✔ True ✘ False

Q 23 / 25

Ammonium chloride \(\mathrm{ (NH_4Cl)}\) is a neutral salt.

✔ True ✘ False

Q 24 / 25

Bleaching powder is used for disinfecting drinking water.

✔ True ✘ False

Q 25 / 25

The pH scale ranges from 0 (most acidic) to 14 (most basic).

✔ True ✘ False

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ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025

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Acids, Bases and Salts - True/False

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