Acid, bases and salts

Identify the acid present in tamarind.

• A) Tannic acid

• B) Lactic acid

• C) Tartaric acid

• D) Citric acid

From which of the following is the natural indicator litmus extracted?

• A) Mycorrhiza

• B) Lichens

• C) Mucor

• D) Mycelia

What is injected into the skin when an ant bites?

• A) Acid

• B) Base

• C) Salt

• D) Water

Which of the following is an antacid?

• A) Mg(OH)2

• B) NaOH

• C) H2SO4

• D) H2O

Which of the following statements is correct

• A) Acids turn blue litmus red.

• B) Bases turn red litmus blue.

• C) Water changes the colour of a litmus.

• D) Both (A) and (B)

How does methyl orange indicator change its colour in the presence of bases?

• A) Green

• B) Black

• C) Red

• D) Yellow

What is the effect of the soap solution on phenolphthalein?

• A) It turns pink.

• B) It remains colourless.

• C) It turns blue.

• D) It turns red.

A base reacts with an acid to form salt and water. What is this reaction called?

• A) Oxidation reaction

• B) Neutralization reaction

• C) Reduction reaction

• D) Biochemical reaction

Study the given reaction. NaOH+HCl→NaCl+H2O Identify the salt in the above reaction.

• A) NaCl

• B) H2O

• C) HCl

• D) NaOH

Sunidhis teacher asked her to prepare dilute sulphuric acid from concentrated sulphuric acid. What should she do?

• A) Add water to the acid

• B) Add acid to the water

• C) Add both acid and base together