Page 196 - Chemistry ICSE Class X

182 ICSE Chemistry – 10
Q.6. Shyam took sulphur powder on a spatula and heated it. He collected the
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alongside.
(a) What will be the action of gas on
(i) dry litmus paper? (ii) moist litmus paper?
(b) Write a balanced chemical equation for the reaction taking place.
Ans. (a) When sulphur is heated in air, sulphur dioxide gas is formed. This
gas has no effect on dry litmus paper. The gas turns the moist blue
litmus to red. On prolonged contact with the gas, the litmus paper gets
Collection of gas in a test tube decolourised.
'
(b) S(s) + O (g) o SO (g)
2
2
heated from air
ASSIGNMENT 2

Physical and chemical properties of metals and nonmetals

ϭ͘ tŚŝĐŚ ŝƐ ŵŽƌĞ ŵĞƚĂůůŝĐ Ͷ ƐŽĚŝƵŵ Žƌ ĂůƵŵŝŶŝƵŵ͍
Ϯ͘ DĞƚĂůƐ ĂƌĞ ĞůĞĐƚƌŽƉŽƐŝƟǀĞ ŝŶ ŶĂƚƵƌĞ͘ tŚLJ͍
ϯ͘ DĞƚĂůƐ ďĞŚĂǀĞ ĂƐ ƌĞĚƵĐŝŶŐ ĂŐĞŶƚƐ͘ tŚLJ͍
ϰ͘ EĂŵĞ ƚŚĞ ŵĞƚĂů ǁŚŝĐŚ ďƵƌŶƐ ŝŶ Ăŝƌ ǁŝƚŚ Ă ŐŽůĚĞŶ ŇĂŵĞ͘
ϱ͘ EĂŵĞ ƚŚĞ ŵĞƚĂů ǁŚŝĐŚ ŝƐ ƐƚŽƌĞĚ ƵŶĚĞƌ ŬĞƌŽƐĞŶĞ͘
ϲ͘ EĂŵĞ ƚǁŽ ŵĞƚĂůƐ ǁŚŝĐŚ ĐĂŶ ĚŝƐƉůĂĐĞ ŚLJĚƌŽŐĞŶ ĨƌŽŵ ĚŝůƵƚĞ ŚLJĚƌŽĐŚůŽƌŝĐ ĂĐŝĚ͘
ϳ͘ tŚĂƚ ƚLJƉĞƐ ŽĨ ŽdžŝĚĞƐ ĂƌĞ ĨŽƌŵĞĚ ďLJ ŵĞƚĂůƐ͍ 'ŝǀĞ ŽŶĞ ĞdžĂŵƉůĞ ŽĨ ĞĂĐŚ͘
ϴ͘ Ŷ ĞůĞŵĞŶƚ ƌĞĂĐƚƐ ǁŝƚŚ ŽdžLJŐĞŶ ƚŽ ĨŽƌŵ ĂŶ ŽdžŝĚĞ ǁŚŝĐŚ ĚŝƐƐŽůǀĞƐ ŝŶ ĚŝůƵƚĞ ŚLJĚƌŽĐŚůŽƌŝĐ ĂĐŝĚ͘ dŚĞ ŽdžŝĚĞ ĨŽƌŵĞĚ ĂůƐŽ ƚƵƌŶƐ
Ă ƐŽůƵƟŽŶ ŽĨ ƌĞĚ ůŝƚŵƵƐ ďůƵĞ͘ /Ɛ ƚŚĞ ĞůĞŵĞŶƚ Ă ŵĞƚĂů Žƌ Ă ŶŽŶŵĞƚĂů͍ džƉůĂŝŶ ǁŝƚŚ ƚŚĞ ŚĞůƉ ŽĨ Ă ƐƵŝƚĂďůĞ ĞdžĂŵƉůĞ͘
ϵ͘ EĂŵĞ ŽŶĞ ŵĞƚĂů ĞĂĐŚ ŽĨ ƚŚĞ ĨŽůůŽǁŝŶŐ ƚLJƉĞƐ͗
;ĂͿ tŚŝĐŚ ƌĞĂĐƚ ǁŝƚŚ ǁĂƚĞƌ Ăƚ ƌŽŽŵ ƚĞŵƉĞƌĂƚƵƌĞ ;ďͿ tŚŝĐŚ ƌĞĂĐƚ ǁŝƚŚ ŽŶůLJ ďŽŝůŝŶŐ ǁĂƚĞƌ
ϭϬ͘ tŚĂƚ ŚĂƉƉĞŶƐ ǁŚĞŶ ĂŶ ŝƌŽŶ ŶĂŝů ŝƐ ƉůĂĐĞĚ ŝŶ Ă ĐŽƉƉĞƌ ƐƵůƉŚĂƚĞ ƐŽůƵƟŽŶ͍
ϭϭ͘ 'ŝǀĞ ĞdžĂŵƉůĞ ƚŽ ŝůůƵƐƚƌĂƚĞ ƚŚĞ ĞůĞĐƚƌŽŶĞŐĂƟǀĞ ŶĂƚƵƌĞ ŽĨ ŶŽŶŵĞƚĂůƐ͘
ϭϮ͘ EĂŵĞ
;ĂͿ ƚǁŽ ĂĐŝĚŝĐ ŽdžŝĚĞƐ ŽĨ ŶŽŶŵĞƚĂůƐ͘
;ďͿ ƚǁŽ ŶĞƵƚƌĂů ŽdžŝĚĞƐ ŽĨ ŶŽŶŵĞƚĂůƐ͘
;ĐͿ ƚŚĞ ŚLJĚƌŝĚĞ ŽĨ Ă ŶŽŶŵĞƚĂů ŚĂǀŝŶŐ Ă ƐŵĞůů ŽĨ ƌŽƩĞŶ ĞŐŐƐ͘
;ĚͿ ƚŚĞ ŵĞƚĂů ǁŚŝĐŚ ŝƐ ƚŚĞ ŵŽƐƚ ŵĂůůĞĂďůĞ ĂŶĚ ĚƵĐƟůĞ͘
;ĞͿ ƚŚĞ ŶŽŶŵĞƚĂů ǁŚŝĐŚ ŝƐ Ă ŐŽŽĚ ĐŽŶĚƵĐƚŽƌ ŽĨ ŚĞĂƚ ĂŶĚ ĞůĞĐƚƌŝĐŝƚLJ͘
ϭϯ͘ ;ĂͿ EĂŵĞ Ă ŶŽŶŵĞƚĂů ǁŚŝĐŚ ĚŝƐƉůĂĐĞƐ ůĞƐƐ ƌĞĂĐƟǀĞ ŶŽŶŵĞƚĂůƐ ;ďĞůŽŶŐŝŶŐ ƚŽ ƚŚĞ ƐĂŵĞ ŐƌŽƵƉͿ ĨƌŽŵ ƚŚĞŝƌ ƐĂůƚƐ͘
;ďͿ tƌŝƚĞ ƚŚĞ ĐŽƌƌĞƐƉŽŶĚŝŶŐ ĐŚĞŵŝĐĂů ĞƋƵĂƟŽŶ͘
ϭϰ͘ ;ĂͿ EĂŵĞ Ă ŵĞƚĂů ƚŚĂƚ ŝƐ ŶŽƚ ƐŽůŝĚ Ăƚ ƌŽŽŵ ƚĞŵƉĞƌĂƚƵƌĞ͘
;ďͿ EĂŵĞ Ă ŶŽŶŵĞƚĂů ǁŚŝĐŚ ŝƐ Ă ŐŽŽĚ ĐŽŶĚƵĐƚŽƌ ŽĨ ŚĞĂƚ ĂŶĚ ĞůĞĐƚƌŝĐŝƚLJ͘
ϭϱ͘ ŽŵƉĂƌĞ ƚŚĞ ĨŽůůŽǁŝŶŐ ƉƌŽƉĞƌƟĞƐ ŽĨ ŵĞƚĂůƐ ĂŶĚ ŶŽŶŵĞƚĂůƐ͗
;ĂͿ DĂůůĞĂďŝůŝƚLJ ;ďͿ ůĞĐƚƌŝĐĂů ĐŽŶĚƵĐƟǀŝƚLJ

Occurrence of Metals

How do metals occur in nature

Metals occur in nature in the free as well as in the combined states. The
less reactive metals like silver, gold and platinum are generally found in
the free state. Most of the metals, however, are found in the combined form
as minerals.
Less reactive metals such as gold
can be found naturally in free form.