Physical Nature

Q. Hydrogen gas is not widely used as a reducing agent because

1. hydrogen decomposes to atomic hydrogen at higher temperature.
2. hydrogen isomerises to ortho hydrogen at a higher temperature..
3. many metals form hydrides at lower temperature.
4. there is a risk of an explosion from oxygen and hydrogen in air.

Q. Gold is malleable in nature.

1. False
2. True

Q. The property by which metals can be beaten into sheets is known as _______.

1. sonority
2. malleability
3. lustre
4. ductility

Q. Identify the metal X on the basis of properties described.
The metal X is highly ductile and is the most malleable substance.

1. Aluminium
2. Gold
3. Copper
4. Iron