Metals Non metals

What happens when calcium is treated with water ?

i) no reaction with water

ii) violent reaction

iii) less violent reaction

iv) bubbles of H2 gas stick to the surface of calcium

• i and iv

• ii and iii

• i and ii

• iii and iv

which of the following pair of metals exist in their native state in nature

Au

Ag

Cu

Al

• Ag and Cu

• Au and Cu

• Ag and Al

• Ag and Au

electric wires have a coating of an insulating material. The material can be used

• Rubber

• plastic

• both rubber and plastic

• PVC

generally metals react with acids to form salt and H2 gas

On reaction with HNO3 which of the following metals will react to form salt and hydrogen

• Mn and Mg

• Mn

• Mg

• None of the above

incorrect statement about Magnesium ?

• It burns in oxygen with the dazzling white flame

• It reacts with hot water to form magnesium hydroxide and evolve hydrogen gas

• It reacts with cold water to form magnesium hydroxide and evolve hydrogen gas

• It reacts with steam to form magnesium hydroxide and evolve hydrogen gas

which of the following properties are responsible for aluminium to be ued for cooking utensils ?

i ductility

ii high melting point

iii good thermal conductivity

iv good electrical conductivity

• i and ii

• ii and iv

• ii and iii

• ii and iv

which of the following property is *generally not* shown by metals

• lustre

• good conductivity

• softness

• sonorous in natiure

which of the following metal reacts with cold as well as hot water

• Na

• Ca

• Mg

• Fe

Diamond - an allotrope of carbon is the hardest substance as well as have :

• high melting point

• low boiling point

• high melting point but low boiling point

• high melting point as well as high boiling point

which of the following oxide of iron would form onreaction with steam

• FeO

• Fe3O4

• Fe2O3

• Fe2O3 and Fe3O4