Which of the following pairs will give displacement reactions?

1

(a)

NaCl solution and copper metal

(b)

MgCl₂ solution and aluminium metal

(c)

FeSO₄ solution and silver metal

(d)

AgNO₃ solution and copper metal

An element reacts with oxygen to give a compound with a high melting point. This compound is also suitable in water. The element is likely to be

1

(a)

Calcium

(b)

Carbon

(c)

Silicon

(d)

Iron

The ability of metals to be drawn into thin wire is known as

1

(a)

Ductility

(b)

mallleability

(c)

Sonorousity

(d)

conductivity

Which one of the following metals do not react with cold as well as hot water?

1

(a)

Na

(b)

Ca

(c)

Mg

(d)

Fe

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

1

(a)

FeO

(b)

Fe₂O₃

(c)

Fe₃O₄

(d)

Fe₂O₃ and Fe₃O₄

What happens when calcium is treated with water?

(i) It does not react with water.

(ii) It reacts violently with water.

(iii) It reacts less violently with water.

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.

1

(a)

(i) and (iv)

(b)

(ii) and (iii)

(c)

(i) and (ii)

(d)

(iii) and (iv)

Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

1

(a)

H₂SO₄

(b)

HCl

(c)

HNO₃

(d)

All of these

Which of the following are not ionic compounds ?
(i) KCl  (ii) HCl   (iii) CCl₄   (iv) NaCl

1

(a)

(i) and (ii)

(b)

(ii) and (iii)

(c)

(iii) and (iv)

(d)

(i) and (iii)

Which one of the following properties is not generally exhibited by ionic compounds?

1

(a)

Solubility in water

(b)

Electrical conductivity in solid state

(c)

High melting and boiling points

(d)

Electrical conductivity in molten state

Which of the following metals exist in their native state in nature?
(i) Cu   (ii) Au   (iii) Zn  (iv) Ag

1

(a)

(i) and (ii)

(b)

(ii) and (iii)

(c)

(ii) and (iv)

(d)

(iii) and (iv)

What is the purpose of quenching steel?

1

(a)

Quenching makes steel very hard and brittle.

State a reaction in which SO₂ acts as an oxidising agent.

1

(a)

Sulphur dioxide oxidises hydrogen sulphide (H₂ S) to sulphur (S).
\({ SO }_{ 2 }(g)+{ 2H }_{ 2 }S(aq)\rightarrow 3S(s)+{ 2H }_{ 2 }O(I)\)

Name a non-metal which is in liquid state and a metal which is found in liquid state.

1

(a)

Non-metal - Bromine
Metal - Mercury

Name two metals which do not react with oxygen.

1

(a)

Gold and silver.

What are two types of reducing agents used to reduce metal oxide?

1

(a)

Carbon and highly reactive metals such as sodium, calcium, aluminium are used as reducing agents to reduce metal into metal.

Name one metal and non-metal which exists in liquid state at room temperature?

1

(a)

Metal- mercury, Non-metal- bromine.

Give an example of a metal which is the best conductor of heat.

1

(a)

Silver or Copper.

State two physical properties of gold which are of extreme use to jewellers.

1

(a)

Malleability, ductility, lustrous (Any two).

Name the metal which has very low melting point and can melt with heat of your palm?

1

(a)

Gallium.

An element X forms an oxide which turns red litmus blue. Identify whether X is a metal or non-metal

1

(a)

Metal, because metal oxides are basic in nature.