Free Materials: Metals & Non-Metals 02 Practice Test - 8th Grade
Question 1
Metals are generally sonorous.
True
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.
addition
double displacement
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.
acidic
basic
amphoteric
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.
True
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?
Carbon
Chlorine
Iodine
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?
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 _____.
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?
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.
True
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?
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