Question

1. Name the acid and the base used to form the following salts:
(a) NaHCO
(b) ZnSO4
(c) AICI,
2. A chemical compound X is used in soda acid fire-extinguishers and also an ingredient in antacids.
(a) Identify 'X' and give its chemical formula.
(b) Write a chemical equation for its preparation starting from sodium chloride.
© What happens when this compound is heated strongly?
3. (a) Write two observations you would make when quicks lime is added to water.
(b) A calcium compound which is yellowish white powder is used as a disinfectant and also in textile
industry. Name the compound. Which gas is released when this compound is left exposed to air?
4. Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid is added to test
tube A, while acetic acid is added to test tube B.
(a) In which of the test tube hizzing occurs more vigorously and why?
(b) Write a chemical equation to represent the avove chemical changes taking place in test tube
A and B.
5. A white substance Xhaving a strong smell of chlorine is used to clean a water tal
(a) Identify the chemical substance 'Xand give its chemical formula.
(b) How is the above substance 'X' manufactured ivrite the chemical equation for its preparation.
c) list to important uses of this compound,
6. When concentrated aqueous solution of substance is electrolysed, then NaOH, CI, and H. are produse
Name the substanco
(b) What is the special name of this process and why is it so called?
(c) Which gas is liberated at anode?
(d) List one important use of each product obtained on electrolysis.
7 ) A chemical compound X' is used in glass and soap industry. Identify the compound and give its
chemical formula.
(b) How many molecules of water of crystallization are present in compound X?
(c) How will you prepare the above compound starting from sodium chloride? Give all relevant
equations involved in the process.​

Answer 1

૧. c 3.a And b 5.c 7 c

2.a 4.a 6.b