CBSE Class 10 Science 2018 · Paper 31(B)/C · Question 22

Acids, Bases and Salts 2 marks Easy

State observations of the reactions of dil.

HCl

with the following :

(i)Blue litmus paper
(ii)Red litmus paper
(iii)Zinc-granules
(iv)Solid $NaHCO_{3}$

Answer

Blue litmus turns red, red litmus is unchanged, zinc gives hydrogen gas and sodium hydrogencarbonate gives carbon dioxide.

(i) Blue litmus paper turns red. (ii) Red litmus paper shows no change (it stays red). (iii) Bubbles of a colourless gas, hydrogen, are given off from the zinc granules; the gas burns with a pop sound.

Zn + 2 HCl ⟶ ZnCl_{2} + H_{2}

(iv) Brisk effervescence: carbon dioxide gas is given off, which turns lime water milky.

NaHCO_{3} + HCl ⟶ NaCl + H_{2} O + CO_{2}

🔒 Step-by-step solution

From the board paper

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CBSE Class 10 Science 2018 · Paper 31(B)/C · Question 22

Answer

From the board paper

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