Read the following and answer any four questions from 2(i) to 2(v).
A compound, X of sodium forms a white powder. It is a constituent of baking powder and is used in some antacids. When heated it gives a compound, Y which is anhydrous and absorbs water to become a hydrated salt. When this salt is kept in open air, it loses water molecules in a process called efflorescence. When dissolved in water it forms a strong base and a weak acid, Z.
(i) What is the compound, X?
(a) NaHCO
(ii) The compound, Y is
(a) NaHCO,
(b) Na₂CO,
(b) Na₂CO,
(2) NOH
(c) Na₂CO, 10H₂0
(iii) What is the nature of the solution formed by dissolving Y in water?
(a) Alkaline
(iv) Identify the compound, Z.
(a) CO₂
(b) Acidic
(b) H₂CO,
(c) Neutral
(C) NaOH
(v) Sodium carbonate is a basic compound because it is a salt of a
(a) strong acid and strong base
(c) strong acid and weak base
(d) NaCl
(d) NaCl
(d) It remains insoluble.
(d) H₂O
(b) weak acid and weak base
(d) weak acid and strong base.
Answers
Answer:
I am in class 8 so, I don't know it just the beginning of my class 8
Answer:
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