Page 246 - Chemistry ICSE Class X

232 ICSE Chemistry – 10

ASSIGNMENT 1

Preparation, properties, uses and tests of ammonia

ϭ͘ ;ĂͿ EĂŵĞ ƚŚĞ ƌĞĂŐĞŶƚƐ ƌĞƋƵŝƌĞĚ ƚŽ ƉƌĞƉĂƌĞ ĂŵŵŽŶŝĂ ŝŶ LJŽƵƌ ůĂďŽƌĂƚŽƌLJ͘
;ďͿ tƌŝƚĞ ƚŚĞ ĐŚĞŵŝĐĂů ĞƋƵĂƟŽŶ ĨŽƌ ƚŚĞ ůĂďŽƌĂƚŽƌLJ ƉƌĞƉĂƌĂƟŽŶ ŽĨ ĂŵŵŽŶŝĂ͘
Ϯ͘ ,Žǁ ŝƐ ĂŵŵŽŶŝĂ ŐĂƐ ĐŽůůĞĐƚĞĚ͍
ϯ͘ tŚŝĐŚ ĚƌLJŝŶŐ ĂŐĞŶƚ ŝƐ ƵƐĞĚ ĨŽƌ ĚƌLJŝŶŐ ĂŵŵŽŶŝĂ ŐĂƐ͍ :ƵƐƟĨLJ LJŽƵƌ ĐŚŽŝĐĞ͘
ϰ͘ ƵƌŝŶŐ ƚŚĞ ůĂďŽƌĂƚŽƌLJ ƉƌĞƉĂƌĂƟŽŶ ŽĨ ĂŵŵŽŶŝĂ͕ ŚŝŐŚĞƌ ƌĂƟŽ ŽĨ ƐůĂŬĞĚůŝŵĞ ŝƐ ƵƐĞĚ͘ 'ŝǀĞ ƌĞĂƐŽŶ͘
ϱ͘ tŚLJ ŝƐ ƚŚĞ ŇĂƐŬ ĐŽŶƚĂŝŶŝŶŐ ƚŚĞ ŵŝdžƚƵƌĞ ŽĨ ĂŵŵŽŶŝƵŵ ĐŚůŽƌŝĚĞ ĂŶĚ ƐůĂŬĞĚůŝŵĞ ŬĞƉƚ ŝŶĐůŝŶĞĚ ĚŽǁŶǁĂƌĚ͍
ϲ͘ ĞƐĐƌŝďĞ ,ĂďĞƌ͛Ɛ ƉƌŽĐĞƐƐ ĨŽƌ ƚŚĞ ŵĂŶƵĨĂĐƚƵƌĞ ŽĨ ĂŵŵŽŶŝĂ ǁŝƚŚ ƚŚĞ ŚĞůƉ ŽĨ Ă ĐŚĞŵŝĐĂů ĞƋƵĂƟŽŶ͘
ϳ͘ tƌŝƚĞ ĚŽǁŶ ƚŚĞ ĨŽƌŵƵůĂĞ ŽĨ ƚŚĞ ĨŽůůŽǁŝŶŐ͗
;ĂͿ >ŝƋƵŝĚ ĂŵŵŽŶŝĂ ;ďͿ >ŝƋƵŽƌ ĂŵŵŽŶŝĂ ;ĐͿ >ŝƋƵŽƌ ĂŵŵŽŶŝĂ ĨŽƌƟƐ
ϴ͘ tŚLJ ŝƐ ĚƌLJ Žƌ ůŝƋƵŝĚ ĂŵŵŽŶŝĂ ŶĞƵƚƌĂů ƚŽ ůŝƚŵƵƐ͍
ϵ͘ tŚLJ ŝƐ ƚŚĞ ĂƋƵĞŽƵƐ ƐŽůƵƟŽŶ ŽĨ ĂŵŵŽŶŝĂ ďĂƐŝĐ͍
ϭϬ͘ tŚĂƚ ŚĂƉƉĞŶƐ ǁŚĞŶ ĂŵŵŽŶŝƵŵ ŚLJĚƌŽdžŝĚĞ ŝƐ ĂĚĚĞĚ ƚŽ Ă ƐŽůƵƟŽŶ ŽĨ ĨĞƌƌŝĐ ĐŚůŽƌŝĚĞ͍

Let us Answer Some More Questions

1. Write the structural formula of ammonia.
2. Name the reagent used for drying ammonia gas.
3. How is ammonia gas collected? Why is this method employed?
4. Write the conditions which favour the formation of ammonia in the Haber’s process.
5. Which feature of ammonia molecule leads to the formation of ammonium ion in aqueous solutions?
6. What is the action of ammonia on moist litmus paper?
7. A substance ‘A’ was heated with slakedlime and a gas ‘B’ with a pungent smell was obtained. Name the substance
A and B and give the balanced equation.
8. (a) Write the balanced chemical equation for the preparation of ammonia from ammonium chloride and
slakedlime.
(b) How is ammonia dried and collected in the laboratory?
9. Name,
(a) The gas which is prepared by Haber’s process.
(b) Two gases which give dense white fumes with ammonia.
(c) The gas obtained when ammonia burns in an atmosphere of oxygen without any catalyst.
10. (a) Give two reactions showing the reducing character of ammonia.
(b) Which property of ammonia is demonstrated in the reaction?
NH 3 + HCl o NH Cl
4
11. What happens when
(a) ammonia is passed through an aqueous solution of lead nitrate?
(b) aluminium nitride is reacted with water?
(c) ammonium nitrate is heated?
12. A gas ‘P’ gives dense white fumes with chlorine. Its aqueous solution gives a deep blue colour with copper(II)
hydroxide.
(a) Name the gas (b) Give its formula (c) Give three uses of P
13. Ammonium hydroxide gives a blue precipitate when it combines with a solution of copper salt. The blue
precipitate further dissolves in excess of ammonia solution to give azure blue solution. Explain with equation.