What is the chemical name of baking soda? How is it produced? Give chemical equation.

The chemical name of baking soda is sodium hydrogen carbonate or sodium bicarbonate. Its chemical formula is NaHCO 3 . Baking soda is produced by the Solvay process. In this process carbon dioxide, water, ammonia and brine solution in their concentrated form are used as raw materials. The chemical equation is as follows: CO 2 + H 2 O + NH 3 + NaCl → NaHCO 3 + NH 4 Cl

What is the common name of the compound CaOCl 2 ?

The compound CaOCl 2 is calcium oxychloride or calcium hypochlorite. It is commonly called bleaching powder. It is used for bleaching purposes. It is manufactured by the action of chlorine on slaked lime Ca ( OH ) 2 .

You have been provided with three test tubes. One of them contains distilled water and the other two contains an acidic solution and basic solution respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?

We have to add a few drops of solution from all three test tubes on the red litmus paper separately. The solution which turns red litmus to blue is a basic solution. Use this blue litmus paper to test the solutions in other two test tubes. The solution from the test tube which turns blue litmus paper to red will be the acidic solution. The solution of the test tube which does not change either red or blue litmus paper contains distilled water.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>assam board-2019>Q 8

EASY

10th Assam Board

IMPORTANT

Earn 100

Pratyush took sulphur powder on a spatula and heated it. He collected the evolved by inverting a test tube over it. What will be the action of gas on the following?

Moist litmus paper.

Important Questions on Acids, Bases and Salts

HARD

10th Assam Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>assam board-2020>Q 9

10 mL

of a solution of

NaOH

is found to be completely neutralised by

8 mL

of a given solution of

HCl

. If we take

20 mL

of the same solution of

NaOH

, the amount of

HCl

solution (the same solution as before) required to neutralise it will be:

MEDIUM

10th Assam Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>assam board-2020>Q 10

You have two solutions A and B.

p H

of solution A is

6

and

p H

of solution B is

8 .

Which solution has more hydrogen ion concentration? Which of the above solutions is acidic and which one is basic?

HARD

10th Assam Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>assam board-2020>Q 12

What is brine? What is the product formed when electricity is passed through this brine? Write the balanced chemical equation for the above reaction.

HARD

10th Assam Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>assam board-2020>Q 13

You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.