Chemistry Model question Papers for ICSE Xth standard

Chemistry Model question Papers for ICSE


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ICSE Sample paper

Chemistry.

(One hour and a half)

Answer to this paper must be written in the paper provided separately. You will not be allowed to write

during the first two 15 minutes. This time is to be spent in reading the question paper.

The time given at the head of this paper is the time allowed for writing the answers.

Section I is compulsory. Attempt any four questions from Section-II. The intended marks are given in

brackets [ ].

SECTION- I (40 marks)

All questions are Compulsory.

1. Write balanced equation for the reactions: [5]

(a) Laboratory preparation of ammonia from ammonium chloride.

(b) Nitric acid from potassium nitrate.

(c) Hydrogen chloride is passed into cold water.

(d)Heated CuO reacts with ammonia.

(e) Propane gas burns in Chlorine.

2. State the following: [5]

(a) Avogardo’s law.

(b) Gay Lussac’s law.

(c) Boyle’s law.

3. State the following: [5]

(a) A gas with atomicity one.

(b) A hygroscopic acid.

(c) A gas with a pungent smell which decolorizes.

(d) Two ores of iron.

(e) Chemical name of alum.

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4. A gas in a container of volume 10cm3 under pressure 2 bar is allowed to expand

under a pressure of 4 bar. What will be the volume of the gas after expansion?

[4]

5. (i) What is an alloy? [4]

(ii) What is the special property of Duralumin, Type Metal.

6. How many valence electrons are present in metals and non-metals? [2]

7. Give the formula of Bauxite, Cryolite, Haematite and Calamine. [2]

8. (i) Name the metal which is liquid at room temperature. [2]

(ii) An allotrope of carbon which conducts electricity.

9. How will you distinguish between: [3]

(i) Ethane and Ethene.

(ii) Ethene and Ethyne.

(iii) Ethane and Ethyne.

10. The element M has the electronic configuration 2,8,8,1. Answer the following: [2]

(i) The sign and charge of on the simple ion M.

(ii) What is the color of flame test on M.

11. The compound X is a Hydrocarbon containing 20% hydrogen. What is the

empirical formula of X. [3].

12. (i) Name a nitrate which on heating gives oxygen as the only gaseous product.

[3]

(ii) An organic liquid which bursts into flames on addition of concentrated

Nitric acid.

(iii) A drying agent which forms addition compound with ammonia.

SECTION-II (40 marks)

(Attempt and FOUR questions)

13. (a)Why the color of Copper Sulphate solution slowly disappears using Platinum

electrodes, but the color of the solution does not change if Copper electrodes

are used? [4]

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(b) What do you observe when (i) Lead Nitrate is heated. (ii) Sulphur dioxide gas

is passed through lime water in excess. Explain with chemical equation. [4]

(c) Calculate the percentage of Chlorine in Ammoniym Chloroplatinate. [2]

[ H=1,N=14, O=16, Pt=195, Cl=35.5,]

14. (a) Define the term ionization energy? Explain how it varies in a group along a

period? [4]

(b) Name the principal ore from which (i) iron and (ii) Aluminum are obtained.[2]

(c) Explain how the impurities in iron and aluminium ores are removed ? [4]

15. (a)Explain with equations, manufacturing of Nitric acid by Ostwald process. [4]

(b)Calculate the percentage of Calcium in Ca(H2PO4)2 [2]

(c) Explain with equation, the manufacture of sulphuric acid by contact process.

[4]

16. (a) Complete the following ionic equation and state which one is

oxidation/reduction. [4]

(i) Fe++ ------------- Fe+++

(ii) Pb+4--------- Pb+2

(iii) 4OH- --------- 2H2 + O2.

(iv) Cl2 -------------- 2Cl-

(b) During electroplating, explain why [6]

(i) A direct current is used.

(ii) Anode is the material which will electroplate

(ii) The article to be electroplated should always be the cathode.

17. (a) The pressure of one mole of gas at S.T.P. is doubled and the temperature is

raised to 600 K. What is the final volume of the gas? [3]

(b) The atoms X and Y have electronic configuration 2,8,18,2 and 2,6

respectively. [2]

(i) To which periods X and Y belong?

(ii) To which groups X and Y belong?

( c) Why the pink colored solution of KMnO4 decolorizes when SO2 gas is passed

through it? Explain with equations.



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[4]

(d) Mention one use of oxy acetylene flame. [1]

18. (a) Explain why moist blue litmus paper first turns red and then colorless when

comes in contact with chlorine gas? [3]

(b) Why rain water contains traces of Nitric acid? [3]

(c) Explain with a suitable sketch, the extraction of Aluminum by the process of

Electrolysis. [4]