Name a carbonate of a metal which has cleansing properties. 8. Name the chemical which is used as a preservative in pickles and curing fish. 9. Name two metals which react with concentrated sodium hydroxide solution to liberate hydrogen gas. 10. Write the general word equation for reaction between acids and bases. 11. Blue and red litmus papers are placed simultaneously in a colourless aqueous solution. It is found that the colour of both litmus papers is red. What is the nature of the solution and why? 12. What is the chemical name of washing soda? Name the three chief raw materials used for making washing soda by
Answers
7. Name a carbonate of a metal which has cleansing properties.
Both sodium- and potassium carbonate are 'cleaners'.
8. Name the chemical which is used as a preservative in pickles and curing fish.
In fermentation pickling, the food itself produces the preservation agent, typically by a process involving Lactobacillus bacteria that produce lactic acid as the preservative agent.
9. Name two metals which react with concentrated sodium hydroxide solution to liberate hydrogen gas.
Zinc and aluminium.
10. Write the general word equation for reaction between acids and bases.
When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water. The compound formed by the cation of the base and the anion of the acid is called a salt.
11. Blue and red litmus papers are placed simultaneously in a colourless aqueous solution. It is found that the colour of both litmus papers is red. What is the nature of the solution and why?
If both litmus papers are red, then one is acid and other is base.
12. What is the chemical name of washing soda? Name the three chief raw materials used for making washing soda by
The chemical name of washing soda is Sodium Carbonate, its chemical formula is Na2CO3. The three chief raw material used for making Washing soda are:
1. Sodium chloride (NaCl) as brine
2. Ammonia( NH3)
3. Lime stone (CaCO3)