Chemistry Past Questions And Answers
Which transition metal is known for its multiple colorful oxidation states and compounds used in pigments and paints?
- A. Silver (Ag)
- B. Copper (Cu)
- C. Gold (Au)
- D. Zinc (Zn)
What process is involved in the reaction represented by the following equation? AICI3 + 3H2O(l) → AI(OH)3(s) + 3HCI(g)
- A. dehydration
- B. hydrolysis
- C. double decomposition
- D. Neutralization
Which of the following reactions is an oxidation process?
- A) 2H^+ + 2e^-→H2
- B) 2O2^−+ 4e^−→O2
- C) OCl^−+ H2O + 2e^−→2OH^−+ Cl^−
- D) Cl + e^−→Cl^−
The complete hydrogenation of C6 H6 in the presence of nicked catalyst at 200°C gives
- A. C6H8
- B. C6H10
- C. C6H12
- D. C6H14
Which of the following gases will bleach moist litmus paper?
- A. Cl2
- B. Co2
- C. So3
- D. HCl
A given mass of gas occupies a certain volume at 300K. At what temperature will its volume be double?
- A) 400K
- B) 480K
- C) 550K
- D) 600K
The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
- A) carbon-14
- B) phosphorus-32
- C) cobalt-60
- D) iodine-131
Which of the following equimolar solutions has the highest conductivity?
- A. CH3COOH(aq)
- B. H2CO3(aq)
- C. H2SO4(aq)
- D. NaOH (aq)
The following transition metal ions would be coloured in aqueous solution except?
- A. Cr3+
- B. Fe3+
- C. Mn3+
- D. Sc3+
What is the quantity of electricity produced when a current of 0.5A is passed for 5 hours 45mins? (F = 96500C)
- A) 0.11F
- B) 0.12F
- C) 0.22F
- D) 1.1F