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ICSE Class 10 Chemistry Solved Question Paper 2011

Short Answer Type

31.

What would you observe in the following case?

Sugar crystal is added to a hard glass test tube containing concentrated sulphuric acid.

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32.

What happens to the crystals of washing soda when exposed to air? Name the phenomenon exhibited.

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33.

What would you observe in the following case?

Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate.

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34.

Write the balanced chemical equation for the following reaction:

Zinc is heated with sodium hydroxide solution.

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35.

Write balanced chemical equation for the following:

Zinc oxide dissolves in sodium hydroxide

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36.

Calculate the volume of 320g of SO₂ at stp.(atomic mass : S=32 and O=16)

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37.

State Gay-Lussac’s law of combining volumes.

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38.

Calculate the volume of oxygen required for the complete combustion of 8.8g of propane (C₃H₈).

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39.

An organic compound with vapour density=94 contains C =12.67%, H=2.13% and Br=85.11%. Find the molecular formula,[Atomic mass: C=12, H=1, Br=80]

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40.
Calculate the mass of :

i) 10²²atoms of sulphur

ii) 0.1 Mole of carbon dioxide

[Atomic mass : S =32.C=12 and O =16 and Avogadro's number=6x10²³]

i) If 6 x 10²³ atoms of sulphur =32

Then, 10²² atoms of sulphur = $fraction numerator 32 over denominator 6 space straight x space 10 to the power of 23 end fraction straight x space 10 to the power of 22 space equals 0.53 space gm$

ii) If 1 mole of CO₂ =44 gm
Then, 0.1 mole of CO₂ = $44 over 1 space x space 0.1 space equals space 4.4 space gm$