Page 91 - Chemistry ICSE Class IX
P. 91
Water 79
Illustrative Questions
Q.1. Which of the following pairs will give displacement reactions?
(a) NaCl solution and copper metal
(b) MgCl solution and aluminium metal
2
(c) FeSO solution and silver metal
4
(d) AgNO solution and copper metal
3
Ans. The correct answer is (d).
Copper is more reactive than silver. So, it displaces silver from AgNO solution.
3
2AgNO (aq) + Cu(s) o 2Ag(s) + Cu(NO ) (aq)
3 2
3
silver nitrate copper silver copper(II) nitrate
Q.2. Name some habitats which are provided to organisms by water.
Ans. All water bodies, such as seas, lakes, rivers and ponds, are good habitats for many organisms.
Q.3. Name one metallic element and one nonmetallic element which are obtained on a large scale generally from sea
water.
Ans. Metals obtained from sea water: Sodium, Magnesium
Nonmetals obtained from sea water: Chlorine, Bromine, Iodine.
ASSIGNMENT 4
Chemical properties of water, Activity series of metals on the basis of their reactivity with water, Importance of
water, Hydrated substances, Anhydrous substances, Deliquescent substances, Soft water and hard water
ϭ͘ tŚĂƚ ŝƐ ƚŚĞ ŶĂƚƵƌĞ ŽĨ ƚŚĞ ĨŽůůŽǁŝŶŐ͍
;ĂͿ ƐŽůƵƟŽŶ ŽĨ ƐŽĚŝƵŵ ĐĂƌďŽŶĂƚĞ ŝŶ ǁĂƚĞƌ ;ďͿ ƐŽůƵƟŽŶ ŽĨ ĨĞƌƌŝĐ ĐŚůŽƌŝĚĞ ŝŶ ǁĂƚĞƌ
Ϯ͘ tƌŝƚĞ ĐŚĞŵŝĐĂů ĞƋƵĂƟŽŶƐ ĨŽƌ ƚŚĞ ĨŽůůŽǁŝŶŐ͗
;ĂͿ ĐƟŽŶ ŽĨ ĐŽůĚ ǁĂƚĞƌ ŽŶ ƐŽĚŝƵŵ ŵĞƚĂů ;ďͿ ĐƟŽŶ ŽĨ ďŽŝůŝŶŐ ǁĂƚĞƌ ŽŶ ŵĂŐŶĞƐŝƵŵ
;ĐͿ ĐƟŽŶ ŽĨ ƐƚĞĂŵ ŽŶ ƌĞĚ ŚŽƚ ŝƌŽŶ
ϯ͘ ZĞĂƌƌĂŶŐĞ ƚŚĞ ĨŽůůŽǁŝŶŐ ŵĞƚĂůƐ ŝŶ ƚŚĞ ŝŶĐƌĞĂƐŝŶŐ ŽƌĚĞƌ ŽĨ ƌĞĂĐƟǀŝƚLJ ǁŝƚŚ ǁĂƚĞƌ͗ ĂůƵŵŝŶŝƵŵ͕ njŝŶĐ͕ ŵĞƌĐƵƌLJ ĂŶĚ ĐŽƉƉĞƌ͘
ϰ͘ tŚĂƚ ǁŝůů LJŽƵ ŽďƐĞƌǀĞ ǁŚĞŶ
;ĂͿ ^ŽĚŝƵŵ ŽdžŝĚĞ ŝƐ ĚŝƐƐŽůǀĞĚ ŝŶ ǁĂƚĞƌ ;ďͿ ĂƌďŽŶ ĚŝŽdžŝĚĞ ŝƐ ĚŝƐƐŽůǀĞĚ ŝŶ ǁĂƚĞƌ͘
ϱ͘ EĂŵĞ ƚǁŽ ŵĞƚĂůƐ ǁŚŝĐŚ ĚŽ ŶŽƚ ƌĞĂĐƚ ǁŝƚŚ ǁĂƚĞƌ ĞǀĞŶ ƵŶĚĞƌ ƐĞǀĞƌĞ ĐŽŶĚŝƟŽŶƐ͘
ϲ͘ tŚĂƚ ĂƌĞ ƚŚĞ ƵƐĞƐ ŽĨ ǁĂƚĞƌ͍
ϳ͘ 'ŝǀĞ ƌĞĂƐŽŶƐ͗
;ĂͿ WůĂƟŶƵŵ͕ ŐŽůĚ ĂŶĚ ƐŝůǀĞƌ ĂƌĞ ƵƐĞĚ ƚŽ ŵĂŬĞ ũĞǁĞůůĞƌLJ͘
;ďͿ ^ŽĚŝƵŵ͕ ƉŽƚĂƐƐŝƵŵ ĂŶĚ ůŝƚŚŝƵŵ ĂƌĞ ƐƚŽƌĞĚ ƵŶĚĞƌ Žŝů͘
;ĐͿ ůƵŵŝŶŝƵŵ ŝƐ Ă ŚŝŐŚůLJ ƌĞĂĐƟǀĞ ŵĞƚĂů͕ ƐƟůů ŝƚ ŝƐ ƵƐĞĚ ƚŽ ŵĂŬĞ ƵƚĞŶƐŝůƐ ĨŽƌ ĐŽŽŬŝŶŐ͘
;ĚͿ ĂƌďŽŶĂƚĞ ĂŶĚ ƐƵůƉŚŝĚĞ ŽƌĞƐ ĂƌĞ ƵƐƵĂůůLJ ĐŽŶǀĞƌƚĞĚ ŝŶƚŽ ŽdžŝĚĞƐ ĚƵƌŝŶŐ ƚŚĞ ƉƌŽĐĞƐƐ ŽĨ ĞdžƚƌĂĐƟŽŶ͘
ϴ͘ EĂŵĞ ƚǁŽ ĂŶŚLJĚƌŽƵƐ ƐƵďƐƚĂŶĐĞƐ͘
ϵ͘ 'ŝǀĞ ƚǁŽ ĞdžĂŵƉůĞƐ ŽĨ ƐĂůƚƐ ĐŽŶƚĂŝŶŝŶŐ ǁĂƚĞƌ ŽĨ ĐƌLJƐƚĂůůŝƐĂƟŽŶ͘
ϭϬ͘ 'ŝǀĞ Ă ďĂůĂŶĐĞĚ ĐŚĞŵŝĐĂů ĞƋƵĂƟŽŶ ƚŽ ƐŚŽǁ ĚĞŚLJĚƌĂƟŶŐ ŶĂƚƵƌĞ ŽĨ ĐŽŶĐ͘ ƐƵůƉŚƵƌŝĐ ĂĐŝĚ͘
ϭϭ͘ DĞŶƟŽŶ ƚǁŽ ĚŝƐĂĚǀĂŶƚĂŐĞƐ ŽĨ ƵƐŝŶŐ ŚĂƌĚ ǁĂƚĞƌ͘
Let us Answer Some More Questions
1. In what forms does the water occur in nature?
2. Draw the structure of water molecule.
3. Name one each of (a) aqueous solution (b) nonaqueous solution.
4. Name two coloured hydrated salts. Give their chemical formulae also.
5. Name the metals which can react with cold water. Write the corresponding chemical equations.
