Class 10 Chemistry
Metals and Non-metals
NCERT Exemplar Solutions
Which among the following alloys contain mercury as one of its constituents?
- Stainless steel
- Alnico
- Solder
- Zinc amalgam
Answer: (d) Zinc amalgam
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?
- Has high melting point
- Has low melting point
- Conducts electricity in molten state
- Occurs as solid
Answer: (b) Has low melting point
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?
- X is a metal
- Y is a metal
- Z is a non-metal
- Y is a non-metal and Z is a metal
Answer: (d) Y is a non-metal and Z is a metal
Although metals form basic oxides, which of the following metals form an amphoteric oxide?
- Na
- Ca
- Al
- Cu
Answer: (c) Al
Generally, non-metals are not conductors of electricity. Which of the following is a good conductor of electricity?
- Diamond
- Graphite
- Sulphur
- Fullerene
Answer: (b) Graphite
Electrical wires have a coating of an insulting material. The material, generally used is
- Sulphur
- Graphite
- PVC
- All can be used
Answer: (c) PVC
Which of the following non-metals is a liquid?
- Carbon
- Bromine
- Phosphorus
- Sulphur
Answer: (b) Bromine