GENERAL SCIENCE #34
MULTIPLE CHOICE QUESTIONS
1. What
is the chemical symbol for nitrogen gas?
(a) Ni
(b) N2
(c) N+
(d) N
Answer:
(b)
2. What
is the chemical symbol for sodium?
(a) So
(b) Sd
(c) NA
(d) Na
Answer:
(d)
3. Which
of the following would weigh the highest?
(a) 0.2 mole of sucrose (C12H22O11)
(b) 2 moles of CO2
(c) 2 moles of CaCO3
(d) 10 moles of H2O
Answer:
(c)
4. Which
of the following has maximum number of atoms?
(a) 18 g of H2O
(b) 18 g of O2
(c) 18 g of CO2
(d) 18 g of CO4
Answer:
(d)
5. Which
of the following correctly represents 360 g of water?
(i) 2 moles of H2O
(ii) 20 moles of water
(iii) 6.022 × 1023 molecules of water
(iv) 1.2044 × 1025 molecules of water
(a) (i)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Answer:
(d)
6. 3.42
g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen
atoms in the solution are ……………
(a) 6.68 × 1023
(b) 6.09 × 1022
(c) 6.022 × 1023
(d) 6.022 × 1021
Answer:
(a)
7. A
change in the physical state can be brought about ……………
(a) only when energy is given to the system
(b) only when energy is taken out from the system
(c) when energy is either given to, or taken out from the
system
(d) without any energy change
Answer:
(c)
8. What
is the relative molecular mass of Na2S2O3.5H2O?
(a) 250 amu
(b) 250 g
(c) 248 amu
(d) 248 g
Answer:
(c)
9. Which
of the following has maximum number of atom?
(a) 18 g H2O
(b) 18 g of O2
(c) 18 g of CO2
(d) 18 g of CH4
Answer:
(d)
10. What
is the percentage of calcium in calcium carbonate?
(a) 40%
(b) 30%
(c) 48%
(d) 36%
Answer:
(a)
11. Which
has maximum number of molecules?
(a) 1 g of CO2
(b) 1 g of N2
(c) 1 g of H2
(d 1 g of CH4
Answer:
(c)
12. What
mass of carbon dioxide (CO2) will contain 3.011 × 1023
molecules?
(a) 11.0 g
(b) 22.0 g
(c) 4.4 g
(d) 44.0 g
Answer:
(b)
13. What
is the value of Avogadro’s constant?
(a) 6.0 × 1024
(b) 6.01 × 1022
(c) 6.022 × 1023
(d) 6.022 × 10-23
Answer:
(c)
14. How
many times an atom of sulphur is heavier than an atom of carbon?
(a) 32 times
(b) 12 times
(c) 8/3 times
(d) 12/32 times
Answer:
(c)
15. The
number of oxygen atoms in 4.4 g of CO2 is approx. ……………
(a) 6 × 1022
(b) 6
(c) 12 × 1023
(d) 1.2 × 1023
Answer:
(d)
16. Which
of the following represents 12 u?
(a) Mass of 1 hydrogen atom
(b) Mass of C-12 atom
(c) Mass of 0-16 atom
(d) 1/12th of mass of C-12 atom
Answer:
(d)
17. Which
of the following would weigh the highest?
(a) 0.2 mole of sucrose (C12H22O11)
(b) 2 moles of CO2
(c) 2 moles of CaCO3
(d) 10 moles of H2O
Answer:
(c)
18. The
molecule having an atomicity of 4 is ……………
(a) sulphate molecule
(b) ozone molecule
(c) phosphorus molecule
(d) methane molecule
Answer:
(c)
19. One
gram of which of the following contains largest number of oxygen atoms?
(a) O
(b) O2
(c) O3
(d) All contain the same
Answer:
(c)
20. Which
of the following has the largest number of particles?
(a) 2g of H2
(b) 4.4g of CO2
(c) 8g of CH4
(d) 34.2g of C12H22O11
Answer:
(a)
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