Questions
46
Which one of the following enhances the growth of plants?
Answer: Fertilisers
47
Which one of the following is used for decorating sweets?
Answer: Silver foil
53
Electrical wires have a coating of an insulating material. The material, generally used is
Answer: PVC
54
Generally non-metals are non-conductors of electricity. Which of the following is a good conductor of electricity?
Answer: Graphite
55
Although metals form basic oxides, which of the following metals form an amphoteric oxide?
Answer: Al
56
The electronic configurations of three elements X, Y and Z are X — 2, 8: Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?
Answer: Y is a non-metal and Z is a metal
57
Reaction between X and Y forms compound Z. X loses electron and y gains electron. Which of the following properties is not shown by Z?
Answer: Has low melting point
58
Which among the following alloys contain mercury as one of its constituents?
Answer: Zinc amalgam
59
Which among the following statements is incorrect for magnesium metal?
Answer: It reacts with cold water to form magnesium oxide and evolves hydrogen gas.
60
Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?
Answer: Steel
