Question

Very Short answer type questions
(1 mark)
1. Two solution have pH number 4 and 9 respectively which solution has more
Hion concentration?
2.
Why should cured and sour substances not be kept in brass and copper
vessel?
3.
What is the chemical name of bleaching powder?
4. Write down the molecular formula for one strong and one weak acid.
5. Explain why plaster of Paris should be stored in a moisture proof container?
6. Name the gas evolved when dil. sulphuric acid acts on sodium carbonate.
7. What is the use of common salt in soap industry?
8. What do you observe when a buring candle is brought near the testube
containing hydrogen gas?
9. Name the indicator used to measure pH values over the whole range.
10. Write the formula of washing powder.
Short Answer Type Questions
(2 marks)​

Answer 1

Answer:

10 Washing soda is a chemical compound with the formula Na2CO3, known as sodium carbonate, and it's a salt of carbonic acid.

Answer 2

Explanation:

7.common salt is added to precipitate out all the soap from the aqueous solution.adding of common Salt to soap solution decreases the solubility of soap due to which all the soap precipitates out from the solution in the solid form.This process is called salting out of soap.