CBSE - Metals and Non-metals

1 Metals and Non-metals 

Consider the following pairs of elements : 

I and H , C and F,  Ba and F,  N and F,  K and O 

The correct statement regarding these pairs is : 

(1) The two pairs Ba and F, K and O most likely to form Ionic bonds 
(2) The least polar bond is formed between C and F 
(3) Bet ween I and H an ionic bond is formed 
(4) Between N and F the covalent bond is most polar

2 Metals and Non-metals 

An element which shows allotrophy when burnt in air gives a gas with characteristic smell. The gas turns blue litmus red and is used as an insecticide. The element is

(1) C
(2) N
(3) P
(4) S

3 Metals and Non-metals 

Calamine ore can be converted into ZnO by the process of.

(1) Dehydration
(2) Roasting
(3) Calcinations
(4) Sulphonation

4 Metals and Non-metals 

Which of the following statement is correct regarding metals and non-metal?

(1) All metals are brittle.
(2) All non-metals are ductile.
(3) Generally metals are ductile.
(4) Non-metals are good conductor of electricity.

5 Metals and Non-metals 

Bauxite is an ore of aluminium. It is concentrated suitably on treating with

(1) Conc. NaOH solution
(2) Na₂CO₃
(3) Coke and N₂
(4) Any of the above

6 Metals and Non-metals 

Which of the following always contains mercury as one of the constituent ?

(1) Stainless steel
(2) Solder
(3) Duralumin
(4) Zinc Amalgam

7 Metals and Non-metals 

Which of the following gas is known as tear gas ?

(1) methyl isocyanide
(2) sulphur dioxide
(3) chloropicrin
(4) nitrous oxide

8 Metals and Non-metals 

Silver jewellery turns blacks when exposed to air for long duration. This is due to the formation of : 

(1) Ag₂O 
(2) Ag₂S 
(3) Ag₂O + Ag₃N 
(4) AgN₃

9 Metals and Non-metals 

Pick up the incorrect pair of metal-ore from the following

(1) Ag – Galena
(2) Mg – Carnallite
(3) Sn – Cassiterite
(4) Hg – Cinnabar

10 Metals and Non-metals 

The impurity present in the ore is called ..........

(1) gangue
(2) flux
(3) slag
(4) mineral