Q1. A process of very slow regulated cooling is known as—
(a) Quenching
(b) Sedimentation
(c) Annealing
(d) Diffusion
Ans.(c)
Q2. Alkali metals belong to which block?
(a) s-block
(b) p-block
(c) d-block
(d) f-block
Ans.(a)
Q3. Corrosion of a metal occurs at the—
(a) Anode
(b) Cathode
(c) Both anode and cathode
(d) None of the above
Ans.(a)
Q4. The difference between isotopes of an element is due to the presence of a different number of—
(a) Protons
(b) Neutrons
(c) Electrons
(d) Photons
Ans.(b)
Q5. Which of the following does not belong to the halogen family?
(a) Chlorine
(b) Fluorine
(c) Bromine
(d) Morphine
Ans.(d)
Q6. The carbon-carbon bond length is shortest in—
(a) Ethane
(b) Ethylene
(c) Benzene
(d) Acetylene
Ans.(d)
Q7. What is the commercial name for calcium hydride?
(a) Lime
(b) Hydrolith
(c) Slaked lime
(d) Calgon
Ans.(b)
Q8. Which of the molecular formula of phosphorus?
(a) P1
(b) P2
(c) P3
(d) P4
Ans.(d)
Q9. A catalyst—
(a) Alters the velocity of a reaction
(b) no change in the velocity of a reaction
(c) Decreases the velocity of a reaction
(d) Starts a reaction
Ans.(a)
Q10. Which of the following cannot be purified by sublimation?
(a) Iodine
(b) Camphor
(c) Citric acid
(d) Naphthalene
Ans.(a)
Q11. Oils and fats are obtained from—
(a) Animal sources
(b) Vegetable sources
(c) Synthesis
(d) Both animal and vegetable sources
Ans.(d)
Q12. A dark purple compound used as an antiseptic and disinfectant is—
(a) Potassium nitrate
(b) Sodium thiosulphate
(c) Potassium permanganate
(d) Calcium phosphate
Ans.(c)
Q13. Which of the following is widely used an anaesthetic?
(a) Methane
(b) Ammonia
(c) Chlorine
(d) Chloroform
Ans.(d)
Q14. Permanent hardness of water is due to the presence of—
(a) Calcium bicarbonate
(b) Magnesium bicarbonate
(c) Calcium sulphate
(d) Sodium bicarbonate
Ans.(c)
Q15. Which of the following is the most commonly used bleaching agent?
(a) Alcohol
(b) Carbon dioxide
(c) Chlorine
(d) Sodium chloride
Ans.(c)
