Previous Year Paper year:2014 : ICSE-X-Chemistry

Home Learn Fast select Course

Change Unit Change Subject Last Menu

ICSE-X-Chemistry

Previous Year Paper year:2014

with Solutions - page 3

#1-e-iii
Action of concentrated sulphuric acid on carbon

#1-e-iv
Action of dilute hydrochloric acid on sodium sulphide

#1-e-v [5]
Preparation of ethane from sodium propionate

#1-f
Distinguish between the following pairs of compounds using the test given within
brackets:

#1-f-i
Iron (II) sulphate and iron (III) sulphate (using ammonium hydroxide)
Ans : Iron II sulphate: Gives dirty green ppt with ammonium hydroxide insoluble in excess.
Iron III sulphate: Gives reddish brown ppt with ammonium hydroxide insoluble in excess.

#1-f-ii
A lead salt and a zinc salt (using excess ammonium hydroxide)
Ans : Lead salt: Gives white ppt with ammonium hydroxide which is insoluble in excess.
Zinc salt: Gives gelatenous white ppt which is soluble in excess ammonium hydroxide.

#1-f-iii
Sodium nitrate and sodium sulphite (using dilute sulphuric acid)
Ans : Sodium nitrate: Colourless vapours of nitric acid which condenses to form nitric acid.
Sodium sulphite: Colourless, gas with smell of burning sulphur, acidic in nature that is sulphur di oxide is released.

#1-f-iv
Dilute sulphuric acid and dilute hydrochloric acid (using barium chloride solution)
Ans : With dil. HCl, BaCl₂ gives no ppt with dil. H₂SO₄, BaCl₂ gives a white insoluble ppt of BaSO₄.

#1-f-v [5]
Ethane and ethene (using alkaline potassium permanganate solution)
Ans : With ethane, purple colour of potassium permanganate remains unfaded with ethene the purple colour gets decolourised.

#1-g
Ans :

#1-g-i
Oxygen oxidises ethyne to carbon dioxide and water as shown by the equation:
$$\ce{2C2H2 + 5O2 -> 4CO2 + 2H2O }$$
What volume of ethyne gas at STP is required to produce ``\pu{8.4 dm3}`` of carbon
dioxide at STP? [H = 1, C = 12, O = 16]

#1-g-ii [5]
A compound made up of two elements X and Y has an empirical formula ``\ce{X2Y}``. If the
atomic weight of X is 10 and that of Y is 5 and the compound ha a vapour density 25,
find its molecular formula.

# [40]
Section : II
Attempt any four questions from this section.

#2

#2-a
State your observation in each of the following cases: