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NIOS Silver Jubilee Year
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Physical Chemistry

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1. Which one of the following comes under aldehyde?

methanal.
acetic acid.
ethyl alcohol.
acetone.

2. The three basic components of an atom are:

protons, neutrons, and ions.
protons, neutrons, and electrons.
protons, neutrinos, and ions.
protium, deuterium, and tritium.

3. Which one of the following comes under aldehyde?

methanal.
acetic acid.
ethyl alcohol.
acetone.

4. The three basic components of an atom are:

protons, neutrons, and ions.
protons, neutrons, and electrons.
protons, neutrinos, and ions.
protium, deuterium, and tritium.

5. The nucleus of an atom consists of:

electrons
neutrons
protons and neutrons
protons, neutrons, and electrons

6. A single proton has what electrical charge?

no charge
positive charge
negative charge
either a positive or negative charge

7. Which two particles would be attracted to each other?

electrons and neutrons
electrons and protons
protons and neutrons
all particles are attracted to each other

8. The atomic number of an atom is:

the number of electrons
the number of neutrons
the number of protons
the number of protons plus the number of neutrons

9. Changing the number of neutrons of an atom changes its:

isotope
element
ion
charge

10. When you change the number of electrons on an atom, you produce a different:

isotope
ion
element
atomic mass

11. The elements of a group in the periodic table-

are isobars
have consecutive atomic numbers
have similar chemical properties
are isotopes

12. Which one among the following nontoxic gases helps in formation of enzymes which ripen fruit?

Methane
Acetylene
Ethane
Carbon dioxide

13. Which one among the following statements is correct?

All bases are alkalis
None of the bases is alkali
There are no more bases except the alkalis
All alkalis are bases but all bases are not alkalis

14. Which was mainly responsible for the Bhopal Mishap in 1984?

Methyl Isocyanate
Carbon dioxide
Amonia
Carbon mono-oxide

15. Bleaching powder is used in drinking water as a/an




{Given: Ag + + NH3 ⇌ [Ag(NH3)] +, K1 = 2 x 10 3 ; [Ag(NH3)] + + NH3 ⇌ [Ag(NH3)2] +, K2 = 4 x 10 3 . The instability constant of [Ag(NH3)2] + is then equal to

8 x 10 6
6 x 10 −3
8 x 10 −6
0.125 x 10 −6

16. The reaction A ¾® B follows first order kinetics. Concentration of A drops to 0.025 M from 0.1 M in 60 minute. Find the rate of the reaction when the concentration is 0.01 M.

3.33 × 10 −4 mol.minute −1
2.31 × 10 −4 mol.minute −1
1.82 × 10 −2 mol.minute −1
1.55 × 10 −4 mol.minute −1

17. Which of the following would convert 2-hexyne into cis-2-hexene?

H2 / Pd-BaSO4 poisoned with CaCO3
Li / NH3
LiAlH4
H2 / Pt

18. Which are the respective methods chiefly employed for the extraction of lead and tin from their ores?

Cyanide reduction and carbon reduction
Carbon reduction and electrolytic reduction
Self reduction and carbon reduction
Self reduction and electrolytic reduction

19. Which are the respective methods chiefly employed for the extraction of lead and tin from their ores?

Cyanide reduction and carbon reduction
Carbon reduction and electrolytic reduction
Self reduction and carbon reduction
Self reduction and electrolytic reduction

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