Question

Your answers are shown below:
1. Given that, the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5% respectively, the atomic mass of Fe is
55.75
55.95 correct
56.05
55.85
2. An alkaloid contains 17.28% of nitrogen and its moleculer mass is 162. The number of nitrogen atoms present in one molecule of alkaloid is
5
3
2correct
4
3. How may atoms are contained in one mole of sucrose (C12H22O11) ?
None of these
5 × 6.62 × 1023 atoms/mole
45 × 6.02 × 1023 atoms/molecorrect
5 × 6.02 × 1023 atoms/mole
4. In the reaction,
2Al(s)+6HCl(aq)→2Al3+(aq)+6Cl–(aq)+3H2(g)
11.2 L H2(g) at STP is produced for every mole HCl(aq) consumedcorrect
6 L HCl (aq) is consumed for every 3L H2(g) produced
67.2 L H2(g) at STP is produced for every mole Al that reacts
33.6 L H2(g) is produced regardless of temperature and pressure for every mole Al that reacts
5. 0.0833 mole of carbohydrate of empirical formula CH2O contain, 1 g of hydrogen. The molecular formula of the carbohydrate is
C6H12O6correct
C5H10O5
C12H22O11
C3H4O3
6. A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca2+ ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture is
(Atomic mass of Ca = 40)
30.6
69.4wrong
25
75correct
7. How many number of aluminium ions are present in 0.051 g of aluminium oxide?
3 ions
6.023 × 1023 ions
9 ions
6.023 × 1020 ionscorrect
8. Which of the following options is not correct?
208 = 3
8008 = 8.008 × 103
5000 = 5.0 × 103
2.0034 = 4correct
9. For the reaction, x + 2y→z
5 moles of x and 9 moles of y will produce
5 moles of z
8 moles of z
4.5 moles of zcorrect
14 moles of z
10. Hydrogen combines with oxygen to form two compounds namely, water and hydrogen peroxide.
Hydrogen + Oxygen→Water
Hydrogen + Oxygen→Hydrogen peroxide
Here, the masses of oxygen which combine with a fixed mass of hydrogen bear simple ratio, will be
4 : 3
1 : 2correct
2 : 1
3 : 4
11. The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. This illustrates the law of
Multiple proportions
Reciprocal proportions
Conservation of mass
Constant proportions correct
12. The volume occupied by 4.4 g of CO2 at S.T.P. is
0.224 L
0.1 L
22.4 L
2.24 Lcorrect
13. The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO4.7H2O. The atomic weight of M is
40.3
36.3
11.3
24.3correct
14. In a compound C, H and N are present in the ratio of 9 : 1 : 3.5 by weight. If molecular weight of the compound is 108, then the molecular formula of the compound is
C2H6N2
C6H8N2correct
C9H12N3
C3H4N2
15. A molal solution is one that contains 1 mole of a solute in
one litre of the solution
22.4 litres of the solution
one litre of the solvent
1000 g of the solvent correct

Answer 1

Answer:

! you have already given all the answer so why are you asking the question?