IIT FOUNDATION
Test – 1 (IX Std)
Name-___________________________________________________
I. CHOOSE THE CORRECT ANSWER:
1) The weight of 1 litres of a gas at STP is 1.16 gm. The gas is
A) CH4 B) C2H6 C) C2H4 D) C2H2
2) The vapour density of a gas is 22. The gas can be
A) Carbon dioxide B) Nitrous oxide
C) Propane D) Any of the above
3) A compound contains 93.7% of carbon and 6.3% of hydrogen. The empirical formula of the compound is
A) CH B) C3H2 C) C5H4 D) C4H3
4) The empirical formula of a compound is CH2O and its molecular weight is 180. The molecular formula of the compound is
A) C6H12O6 B) CH2O C) C2H4O2 D) C12H22O11
5) The vapour density of a gas is given by
A) VD = Mol. Wt. I 2 B) VD =
C) VD = D) All
II. ANSWER THE FOLLOWING.
6) Determine the percentage of iron in Fe3O4
7) Determine the percentage of copper and oxygen in the CuO.
8) Determine the percentage of water of crystallization in FeSO4 . 7H2O
9) What amount of sulphur is required to prepare 500 g of H2SO4 ?
10) Calculate the percentage of copper in copper sulphate crystals CuSO4 5H2O.
11) Find the formula weight K2SO4, Al2(SO4)3.24H2O.
III. ANSWER THE FOLLOWING.
1. An organic compound on analysis gave the following results : C= 65%, H= 3.5%, N=9.6%, O = 21.9%. Its molecular weight was found to be 147. What is the molecular formula of the substance?
2. The percentage composition of an organic acid is
C = 39.96%, H = 6.71%, O = 53.3%.
Its molecules is 29.78 times as heavy as hydrogen molecule. What is the molecular formula of the compound ?
3. Determine the molecular formula of a compound which contains. H = 2.1%, C = 12.8% and Br = 85.1%. 1.0 gm of it occupies 119 cc at N.T.P.


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