Free Materials: Metals & Non-Metals 02 Practice Test - 8th Grade 

Question 1

Metals are generally sonorous.

A.

True

B.

False

SOLUTION

Solution : A

Metals are capable of producing a deep or ringing sound, Thus they are said to be sonorous.

Question 2

A reaction in which a more reactive metal replaces a less reactive metal from its salt solution is called a/an ________ reaction. 

A.

addition

B.

double displacement

C. combination
D.

displacement

SOLUTION

Solution : C

When one metal replaces another metal from its salt solution, the type of reaction is termed as a displacement reaction.

Question 3

Metals, except Al and Zn, react with oxygen to form _______ oxides.

A.

acidic

B.

basic

C.

amphoteric

D.

neutral

SOLUTION

Solution : B

Most of the metals react with oxygen to form metal oxides.

For example: magnesium reacts with oxygen to form magnesium oxide. The reaction involved is:

2Mg(s)+O2(g)2MgO(s)

The metal oxide form alkali solution when dissolved in water. This solution turns red litmus paper to blue. Hence, these metal oxides are basic in nature.

Question 4

An amphoteric oxide is an oxide that can act as either an acid or a base in a reaction.

A.

True

B.

False

SOLUTION

Solution : A

An amphoteric oxide is an oxide that can act both as an acid and as a base. An example is aluminum oxide, Al2O3. It reacts with acids to form the corresponding aluminum salt, and with bases to form salts called aluminates.

Question 5

Which among the following non-metal combines with sodium to form common salt?

A.

Carbon

B.

Chlorine

C.

Iodine

D.

Bromine

SOLUTION

Solution : B

Sodium is a metal ion which combines with an ion of the non-metal chlorine(Cl) to form sodium chloride also know as the common salt.

Question 6

What will be formed if you mix zinc sulphate and copper turnings?

A. Copper sulphate
B. Zinc
C. Copper sulphide
D. No reaction

SOLUTION

Solution : D

In the reaction between zinc sulphate and copper, no products will be formed as the reaction is not possible. Zinc is more reactive than copper and hence copper will not be able to displace zinc from its salt solution.

Question 7

The property of metal by which it can be drawn into wires is called _____.

A. ductility
B. malleability
C. sonority
D. lusture

SOLUTION

Solution : A

The property of metal by which it can be drawn into wires is called ductility. Example, copper and aluminium wires are widely used.

Question 8

Calcium hydroxide is basic in nature. Identify the metal present in the compound?

A. Hydrogen
B. Oxygen
C. Calcium
D. Helium

SOLUTION

Solution : C

Calcium hydroxide is a base. The metal in the given compound is calcium and the non metals present are hydrogen and oxygen.

Question 9

Non-metals are not good conductors of heat hence they can also be called as conductors.

A.

True

B.

False

SOLUTION

Solution : B

Non metals are bad conductors of heat and electricity and hence they are called as insulators.

Question 10

Sodium metal is dipped in which of the following substances for storage?

A. sulphuric acid
B. petrol
C. kerosene
D. vaseline

SOLUTION

Solution : C

Sodium metal is very reactive. It reacts vigorously with oxygen and water. A lot of heat is generated in the reaction. It is, therefore, stored in kerosene