General
✓✗Most abundant metal in the earth’s crust is
- Gold
- Copper
- Aluminium
- Iron
General
✓✗Hydrogen sulphide exhibits
- basic property
- acidic property
- oxidizing property
- bleaching property
General
✓✗Most abundant non-metal is
- O2
- H2
- N2
- O3
General
✓✗Aqua-regia can dissolve
- Gold & Platinum
- Silver
- Copper and Iron
- All metals
General
✓✗The rechargeable battery used in a mobile phone hand set is usually:
- lead ion battery
- sodium ion battery
- hydrogen ion battery
- lithium ion battery
General
✓✗Quenching is
- strong heating
- rapid cooling after heating
- heating after cooling
- treating with salt
General
✓✗Melting point of copper is
- 1083°C
- 1139°C
- 2186°C
- 1563°C
General
✓✗Non metal which is lustrous is
- Sulphur
- Carbon
- Iodine
- Bromine
General
✓✗The major ore of aluminium is known as
- cinnabar
- calamine
- bauxite
- pyrolusite
General
✓✗Which of the following cannot displace Ag from the solution of AgNO3?
- Magnesium
- Zinc
- Gold
- Copper