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| Chapter 1 of FSC part 1 |
Choose the correct MCQs from the following.
1. X – ray work has shown that diameter of atoms are of the order:
(a) 8 x 10-10 m
(c) 2 x 10-8 m (b) 8
x 10-8 m (d) 2 x 10-10
m
2. How
many moles are there in 8 gms of hydrogen gas?
(a) 1
mole (c) 4 moles
(b)
2 moles (d) 8
moles
3. Calculate
the percentage of oxygen in heavy water.
(a) 80% (c) 50%
(b) 60%
(d) 20%
4. The
number of moles of CO2 which contains 16g of oxygen.
(a) 0.50 (c) 1.0 (b) 0.25 (d) 1.50
5. What
is the mass of 4.00 x 10-3 mole of glucose:
(a) 180g
(c) 0.720g
(b)
18.02g (d) 7.20g
6. A
beaker contains 9g of water. The number of H atoms is.
(a)
3.01 x 1023 (c) 6.02 x
1024
(b)
6.02 x 1023 (d) 3.01 x 1024
7. Weight
of single atom of oxygen is:
8. The
volume occupied by 1.4g of N2 at S.T.P is.
(a)
2.24dm3 (c) 1.92dm3
(b)
22.4dm3 (d) 1.12dm3
9. The
percentage of H is highest in:
(a) CH4
(c) H2SO4
(b)
NH3 (d) C6H12O6
10. The
pressure of vapours when sent to the ionization chamber in mass spectrometer
is:
(a)
10-5 to 10-6 torr (c) 10-7 to 10-8 torr
(b) 10-6 to 10-7 torr (d) 10-3 to
10-4 torr
11. Which
of the following compounds contains the highest percentage by mass of nitrogen?
(a)
NH3 (c) (NH4)2
CO3
(b)
NH2CO2NH4 (d) N2H4
12. Which
one of the following compounds does not have the empirical formula CH2O?
(a) Ethanoic
acid, CH3CO2H (c) Glucose,
C6H12O6
(b) Ethanol, CH3CH2OH (d) Methanol, HCHO
13. Which
one of the following has mono atomic molecules?
(a)
Water (c) Ozone
(b) Milk
(d) Hellium
14. When
NH3 gas reacts with HCl white fumes are formed which are chemically?
(a)
NH4 (c) HCl
fumes
(b) NH4Cl (d) Cl-
15. A
compound having empirical formula C3H3O and its molar
mass is 110. Its molecular formula is.
(a) C3H3O
(b)
C6H6O2
16. Example of molecular ion is.
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(c) CaHaO3
(d) C3H6O2
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(a) N+H4
(b) H+3O
17. 1 mole of SO4-2 is
equal to:
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(c) C+H4
(d) All of these
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(a) 92g
of SO4-2
(b) 94g
of SO4-2
18. Mg metal reacts with HCl to give.
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(c) 96g of SO4-2
(d) 98g
of SO4-2
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(a) H2
(b) Cl2
19. Actual yield is affected by.
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(c) Both
a & b
(d) None
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(a) Inexperience
worker
(b) Apparatus
fault
20. The mass of 1 mole of electron is:
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(c)
Side reaction
(d) All of
|
them
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(a) 1.008
mg
(b) 0.184
mg
21. Empirical formula of hydrazine is.
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(c) 1.673mg
(d) 0.55mg
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(a) NH2
(b) N2H3
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(c) N2H4
(d) N2H6
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22. Which
of the following compounds have same number of electrons, protons and neutrons?
(a)
N2 and CO2 (c) N2 and Cl2
(b) N2 and CO (d) N2
and O2
23. The
largest number of molecules are present in.
(a) 3.6 g of H2O (c) 2.8
g of CO
(b) 4.6
g of C2H5OH (d) 5.4
g of N2O5
24. A
neclace has 6g of diamond in it. What is the number of atoms in it?
(a)
6.02 x 1023 (c) 1.003 x 1023
(b)
12.04 x 1023 (d) 3.01 x 1023
25. The
total number of oxygen atoms in 22g of CO2 gas is.
(a) 6.02 x
1023 (b) 3.01
x 1023
(c) 12.04
x 1023
26. Ethylene glycol is used as.
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(d) 3.0 x 1023
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(a) Fuel
in rockets
(b) Sweeting
agent
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(c) Ceramic
material
(d) Antifreez
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27. A
glass is full of water and contains 3.01 x 1023 molecules of H2O.
The mass of water molecule is.
(a)
18g (c) 3g
(b)
9g (d) 0.9g
28. How
many moles of CO are present having 12.04 x 1023 molecules of
CO?
(a)
0.5mol (c) 1.5mol
(b)
1.0mol (d) 2.0mol
29. The
number of Al3+ ions in AlCl3 is 2.007 x 1023 .
The number of Cl- ions are.
(a) 6.02 x 1023 (c) 12.04
x 1023
(b) 3.01
x 1023 (d) 1.5
x 1023
30. One
mole of ethanol and one mol of ethane have an equal?
(a)
Masses (c) No.
of electrons
(b) No.
of atoms (d) No. of
molecules
31. What
is the ratio of volumes of 2g of H2 to the volume of 16g of methane,
both volumes are at STP?
(a)
1:8 (c) 1:1
(b)
1:2 (d) 2:1
32. If
four moles of sulphur dioxide are oxidized to sulphur trioxide, how many moles
of oxygen are present.
(a)
0.5 (c) 1.5
(b)
1.0 (d) 2.0
33. A
compound contains 50% sulphur and 50% oxygen by mass. The empirical formula of
compound is:
(a) SO
(b)
SO2
34. What is the mass of one mol of iodine?
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(c) SO3
(d) S2O3
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(a)
53g
(b)
74g
35. Mass in grams of 2.74 moles of KMno4.
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(c)
127g
(d) 254g
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(a) 332.92g
(b) 232.92g
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(c) 132.92g
(d)
432.92g
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36. The least no. of molecules is present in
30g of.
(a)
N2O (c) NO2
(b)
NO (d) N2O3
37. Efficiency of chemical reaction is
checked by calculating.
(a)
Amount of limiting reactant
(b)
Amount of reactant in
excess
(c)
Amount of product formed (d) Amount
of reactant left unused
38. The
mathematical relationship for m / e is.
(a)
Hr / 2E (c) Hr2
/ 2E
(b)
H2r2
/ 2E (d) H2r
/ 2E
39. The
number of electrons in one mole of hydrogen gas is.
(a)
6.02 x 1023 (c) Only two
(b)
12.04 x 1023 (d) Indefinite
40. The
relative atomic mass of oxygen according to C – 12.00 amu standard is.
(a)
Less then 16
(b)
More then 16
(c)
16 Only
(d) No relationship between their masses
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