Question

1. There are two common oxides of sulphur, one of which contains 50% O, by weight, the other almost 60%. The

weights of sulphur which combine with 1gof O2 (fixed) are in the ratio of

10. A7.66 g sample of hydrated sodium sulphate Na2SO4.

xH,0 forms 4.06 g of anhydrous NazSO4. What is the

value of x? (M Na2SO4 = 142)

(1) 0.2 (2) 3.0 (3) 5 (4) 7

(1) 1:1 (2) 2:1 (3) 2:3 (4) 3:2

2. If u was defined as 1/4th part by weight of an atom

of He' isotope rather than the present convention of

1/12 pat by weight of an atom of C2 isotope, atomic

weight of Al on this scale would be

weight of Al, C and He on C-scale are 27, 12 and

4.003, respectively)

11. The pair of species having same percentage of carbon is

(1) CHCOOH and CH120s

(2) CH,CoOH and C2H,OH

(3) HCOOCH3 and C12zH22011

(Atomic (4) CpH20g and C12H22011

12. A compound prepared as a model of haemoglobin is

4.6% iron by mass if the compound is known to contain

(1) 27.02 (2) 26.98 (3) 27 (4) 25.98 a single iron atom, which of these values will be closest

3. If 1/6 in place of 1/12, mass of carbon atom is taken to

be the relative atomic mass unit, the mass of one mole

to its molar mass?

(1) 1000 g molr

(3) 1400 g mor"

(2) 1200g mo

of a substance will (4) 1600 g mol

(1) Decrease twice

(2) Increase two folds

(3) Remains unchanged

(4) Be a function of the molecular mass of element

4. Given that the abundances of isotopes 54Fe. 5oFe and

57Fe are 5%, 90% and 5%, respectively. The atomic

13. 1 g of hydrogen is found to combine with 80 g of

bromine. 1 g of calcium combine with 4 g of bromine.

Eq. Weight Of calcium is

(1) 16 (2) 20 (3) 40 (4) 80

14. Agaseous hydrocarbon gives upon combustion, 0.72 g

of water and 3.08 g of CO2 The empirical formula of the

mass of Fe hydrocarbon is is

(1) 55.85 (2) 55.95

5. For the reaction

FeS FeSO4 + SO2

(1) CaH (2) CH (3) CHs (4) CHs

15. A purified pepsin (protein containing several amino

acids) isolated from bovine preparation was introduced

in the amino acid analysis. It was seen 0.43 gm of

lysine (molecular weight = 146) was present in 100 gm

of pepsin. Therefore minimum molecular weight of

pepsin approximately is

(1) 34000

(3) 40,000

16. Calculate the mass in gm of 2 g atom of Mg9.

(3) 55.75 (4) 55.05

The equivalent mass of FeS3 is (M is the molecular

weight of Fe2S3)

(1) (2) (3) (4)2

6. Acertain compound has the molecular formula X4Oß. If

10 gm of compound contain 6.06 gm of X, the atomic

(2) 39000

(4) None of these

mass of X is

(4) 48 amu (1) 32 amu (2) 37 amu (3) 42 amu (1) 12 gm

(3) 6 gm

(2) 24 gm

(4) None of these. 7. The average atomic mass of a mixture containing 79

mole % of 2Mg and remaining 21 mole % of 2°Mg and

2Mg is 24.31%. Mole of 2Mg is

(1) 5 (2) 20 (3) 10 (4) 15

17. How many moles of electrons weight one Kg?

(1) 6.023x 1023 (2) 9.108 Xx 10

(3)91010

18. Number of atoms in 558.5 g Fe (at. weight 55.85) is

(4) 9.108x 1 6.023 * 10

8. Two substances I and II of carbon and oxygen have

respectively 72.73% and 47.06% oxygen. Hence, they

follow

(1) law of multiple proportion

(2) law of reciprocal proportion

(3) law of definite proportion

(4) law of conservation of mass

(1) Twice that in 60 g carbon

(2) 6.023x 1022

(3) Half in 8 g He

(4) 558.5 x 6.023 x 1023

19. What is the maximum mass (in grams) of NO that

could be obtained from 15.5 g of NgO, and 4.68 g of

NaH4 when they react?

9. A carbon compound containing carbon and oxygen

has approximate molar mass equal to 290. On analysis

it is found to contain 50% by mass of each element.

Therefore molecular formula of the compound is

(1) Ci209

(3) CO4

The balanced equation is:

(2) C4O3

(4) CgO12

2N2O4 + N, H4 6NO +2H20

(1) 4.38

(3) 15.2

(2) 5.04

(4) 26.2​

Answer 1

Answer:

The correct structure of tri bromooctaoxide

1)

1.O=Br-Br - Br-o

2.o - Br - Br-Br =0

3.O=Br-Br

4.O=Br-Br-Br=0