11th class (FSc) chemistry Unit 1 MCQs
Chapter 1 MCQs 11th Class Chemistry
Basic Concepts:
1. Isotopes differ in:
a. Chemical properties
b. Properties which depends upon mass
c. The extent to which they maybe affected in electromagnetic field
d. Arrangements of electron in orbital
2. Select the most suitable answer from the given once in each question.
a. Isotopes with even atomic masses and even atomic numbers are comparatively abundant
b. Isotopes with even atomic masses are comparatively abundant
c. Isotopes with even atomic masses and odd atomic numbers are comparatively abundant
d. Isotopes with odd atomic masses are comparatively less abundant
3. Many elements have fractional atomic masses. This is because:
a. Atomic masses are average masses of isotopes
b. The mass of atom is itself fractional
c. Atomic masses are average masses of isotopes proportional to their relative abundance
d. Atomic masses are average masses of isobars
4. The mass of one mole of electrons is:
a. 0.184 mg
b. 1.008 mg
c. 1.637 mg
d. 0.55 mg
5. 27g of Al will react completely with how much mass of O2 to produce Al2 O3:
a. 32 g of oxygen
b. 8 g of oxygen
c. 24 g of oxygen
d. 16 g of oxygen
6. The number of moles of CO2 which contain 8.0 g of oxygen:
a. 1.0
b. 0.25
c. 1.5
d. 0.50
7. The largest number of molecules are present in:
a. 2.8 g of CO
b. 3.6 g of H2O
c. 5.4 g of N2O5
d. 4.8 g of C2H5OH
8. One mole of SO2 contains:
a. 6. 02×1023 of sulphur atoms
b. 6. 02×1023of oxygen atoms
c. 4 grams atoms of SO2
d. 18.1 x1023 molecules of SO2
9. The volume occupied by 1.4 g of N2 at STP is:
a. 1.12 dm3
b. 2.24 dm3
c. 112 cm3
d. 22.4 dm3
10. A limiting reactant is the one which:
a. Gives the maximum amount of the product which is requires
b. Is taken in lesser quantity in grams as compared to the other reactants
c. Gives the minimum amount of the product under consideration
d. Is taken in lesser quantity in volume as compared to the other reactants
11. That chemical analysis in which all the elements present in a compound identified is called:
a. Qualitative analysis
b. Quantitative analysis
c. None of these
d. Gravimetric analysis
12. An ordinary microscopic can measure size of object upto:
a. 500nm
b. 300nm
c. 600nm
d. 400nm
13. The size of atom is in the range of:
a. 2 x 10-11m
b. 2 x 10-9m
c. 2 x10-12m
d. 2 x 10-10m
14. 1 A = ……
a. 10-12
b. 10-10
c. 10-15
d. 10-11
15. One amu is equal to:
a. 1.661 x 1024 kg
b. 1.661 x 1027 kg
c. 1.661 x 10-27 g
d. 1.661 x 10-27 kg
16. J.Berzelius determined the:
a. Isotopes
b. Atomic mass
c. Relative abundance
d. Atomic number
17. Mass of electron is:
a. 9.1095 x 10-27Kg
b. 9.1095 x 10-31Kg
c. 9.1095 x 10-31g
d. 9.1095 x10+31Kg
18. How many times a haemoglobin molecule is heavier than hydrogenatom?
a. 68000 times
b. 38000 times
c. 88000 times
d. 58000 times
19. Haemoglobin is a macromolecule and consists of approximatelyatoms:
a. 68000
b. 5000
c. 15000
d. 10000
20. The atomicity of C6H12O6
:
a. 3
b. 6
c. 24
d. 12
21. which is not a molecular ion?
a. NH4+
b. He+
c. CO+
d. CH4+
22. Silver has isotopes:
a. 17
b. 9
c. 18
d.16
23. Tin has isotopes:
a. 11
b. 7
c. 5
d. 9
24. Out of 280 isotopes which occur in nature, the radioactive isotopesare:
a. 30
b. 116
c. 40
d. 126
25. Isotopes are atoms of same element with similar chemical propertiesbut different:
a. Atomic weight
b. Atomic number
c. Atomic structure
d. Atomic volume