Page 108 - Chemistry ICSE Class X

94 ICSE Chemistry – 10
Q 29. State what would you observe when: [ICSE 2016]

(i) Washing soda crystals are exposed to the atmosphere.
(ii) The salt ferric chloride is exposed to the atmosphere.
Q 30. Choose the correct answer from the options given below: [ICSE 2017]
(i) To increase the pH value of a neutral solution, we should add:
(1) an acid (2) an acid salt

(3) an alkali (4) a salt
(ii) Anhydrous iron(III) chloride is prepared by:
(1) direct combination (2) simple displacement

(3) decomposition (4) neutralization
Q 31. Identify the substance underlined, in the following case: [ICSE 2017]
(i) A solid formed by reaction of two gases, one of which is acidic and the other basic in nature.
Q 32. Write a balanced chemical equation for the preparation of each of the following salts: [ICSE 2017]
(i) Copper carbonate (ii) Ammonium sulphate crystals

Q 33. Complete the following by selecting the correct option from the choices given: [ICSE 2017]
(i) The metal which does not react with water or dilute H SO but reacts with concentrated
2
4
H SO is __________ (Al/Cu/Zn/Fe)
2
4
(ii) The metal whose oxide, which is amphoteric, is reduced to metal by carbon
reduction ____________ (Fe/Mg/Pb/Al)
(iii) The divalent metal whose oxide is reduced to metal by electrolysis of its fused
salt is _____________ (Al/Na/Mg/K)
(iv) When a metallic oxide is dissolved in water, the solution formed has a high concentration of __________ ions.
+
–
+
(H , H O , OH )
3
Q 34. Give one word or a phrase for the following statement: [ICSE 2018]
The property by which certain hydrated salts, when left exposed to atmosphere, lose their water of crystallization
and crumble into powder.
Q 35. State one relevant observation for the following: [ICSE 2018]

(i) Anhydrous calcium chloride is exposed to air for some time.
(ii) Barium chloride solution is slowly added to sodium sulphate solution.
Q 36. Fill up the blank with the correct choice given in brackets. [ICSE 2018]
The salt prepared by the method of direct combination is _____________. (iron(II) chloride/iron(III) chloride).

Q 37. Three solutions P, Q and R have pH value of 3.5, 5.2 and 12.2 respectively. Which one of these is a: [ICSE 2018]
K 9GCM CEKF! KK 5VTQPI CNMCNK!
Q 38. Give a chemical test to distinguish between the following pair of chemicals: [ICSE 2018]
Sodium chloride solution and Sodium nitrate solution.
Q 39. Write a balanced equation for the preparation of each of the following salts: [ICSE 2018]

(i) Copper sulphate from Copper carbonate.
(ii) Zinc carbonate from Zinc sulphate.