Important Questions Chemistry
1: The first ionization potencial of N and O are respectively
A: 14.6 , 13.6 eV
B: 13.6, 13.6 eV
C: 13.6, 14.6 eV
D: 14.6, 14.6 eV
Correct Answer: A
2: Solder is
A: Pb + Sn
B: Pb + Zn
C: Pb + Sn + Zn
D: none of these
Correct Answer: A
3: The latest technique for the purification of organic concept is
A: chromatography
B: fractional distillation
C: crystallization
D: vaccum distillation
Correct Answer: A
4: Which of the following contain cobalt?
A: vitamin B1
B: vitamin B9
C: vitamin B2
D: vitamin B12
Correct Answer: D
5: The number of water molecules in gypsum and plaster of paris is respectively
A: 2 and ½
B: 5 and 2
C: 2 and 1
D: 7 and 2
Correct Answer: A
6: Carborundum is
A: Al2(SO4)3
B: AlCl3
C: Al2O3. 2H2O
D: SiC
Correct Answer: D
7: Which of the following is the most stable alkaline ?
A: CH3 = CH2
B: RCH2 = CH2R
C: R2C = CR2
D: RCH = CHR
Correct Answer: C
8: In the reaction Phenol NaOH (A) CO2 + HCI (B) is
A: Benzaldehyde
B: Chlorobenzene
C: Benzoic acid
D: Salicylic acid
Correct Answer: D
9: Which one of the following is not effected by temperature
A: molarity
B: molality
C: normality
D: mole fraction
Correct Answer: C
10: Which of the following is correct order of ionic size?
A: Ca2+> K+> Cl- > S2-
B: Ca2+> Cl- > K+ > S2-
C: S2-> Cl-> K+> Ca2+
D: Cl-> K+> Ca2+> S2-
Correct Answer: B
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