NCERT Class X Science Class: Chapter –2. Acids, Bases and Salts – Part-2

Download PDF of This Page (Size: 161K)

Question 8:

Which of the following gives the correct increasing order of acidic strength?

Answer: A

Question 9:

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

  1. Wash the hand with saline solution

  2. Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

  3. After washing with plenty of water apply solution of sodium hydroxide on the hand

  4. Neutralize the acid with a strong alkali

Answer: B

Question 10:

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?

  1. It turns lime water milky

  2. It extinguishes a burning splinter

  3. It dissolves in a solution of sodium hydroxide

  4. It has a pungent odour

  5. (i) and (ii)

  6. (i), (ii) and (iii)

  7. (ii), (iii) and (iv)

  8. (i) and (iv)

Answer: B

Question 11:

Common salt besides being used in kitchen can also be used as the raw material for making

  1. Washing soda

  2. Bleaching powder

  3. Baking soda

  4. Slaked lime

  5. (i) and (ii)

  6. (i), (ii) and (iv)

  7. (i) and (iii)

  8. (i), (iii) and (iv)

Answer: C

Question 12:

One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is

  1. Hydrochloric acid

  2. Tartaric acid

  3. Acetic acid

  4. Sulphuric acid

Answer: B

Question 13:

To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is

  1. Acidic

  2. Neutral

  3. Basic

  4. Corrosive

Answer: C

Developed by: