# Class 10 Science Metals and Non Metals Important Problem and solutions

In this page we have Class 10 Science Metals and Non Metals Important Problem and solutions . Hope you like them and do not forget to like , social shar and comment at the end of the page.

## Fill in the blanks

Question 1
Nonmetals combine with oxygen to form_________ oxides.
Question 2
Sulphur molecule is _____
Question 3
Best conductor of electricity is_________
Question 4
A list of common metals arranged in order of their decreasing reactivity is known as an ________.
Question 5
When concentrated H2SO4 comes in contact with sugar, it becomes black due to________
Question 6
The extraction of metals from ores and then refining them for use is known as _____.
Question 7
The surface of some metals, such as iron, is corroded when they are exposed to moist air for a long period of time. This phenomenon is known as _____.
Question 8
The best conductors of electricity are copper and ______ .
Question 9
SO2 reacts with Cl2 in the presence of sun light to form__________
Question 10
An alloy of any metals with mercury is called _____ and the electrical conductivity of an alloy is _______ than that of pure metals.
Question 11
Stainless steel contains ________, _________ and ______.
Question 12
A process employed for the concentration of sulphide ore is _____
Question 13
An alloy containing copper (80%), zinc (10%) and tin (10%) is called_______
Question 14
The method of removing volatile matter from carbonate ores is known as _______.
Question 15
Bronze is an alloy of copper and _________ .
Question 16
________processes is used in the extractive metallurgy of magnesium.
Question 17
The main ore of copper is ________ .
Question 18
The reagent is used in Baeer’s process________
Question 19
In electrolytic refining, impure metal is used as ________ .
Question 20
A basic lining is given to a furnace by using__________

## True/ False

Question 1
Sodium metal reacts with both hot water and steam.
Question 2
Bromine is a liquid nonmetal at room temperature.
Question 3
Metals can form positive ions by losing electrons to non- metals.
Question 4
Different metals have same reactivity with water and dilute acids.
Question 5
A more reactive metal displaces a less reactive metal from its salt solution.
Question 6
Metals have low melting and boiling points.
Question 7
Nonmetal reacts with hydrogen to form ionic hydride.
Question 8
Aluminum is the most abundant metal in the earth’s crust.
Question 9
The presence of carbon in pig iron makes it very soft and malleable.
Question 10
Silver is the best conductor of electricity.

### Practice Question

Question 1 Which among the following is not a base?
A) NaOH
B) $NH_4OH$
C) $C_2H_5OH$
D) KOH
Question 2 What is the minimum resistance which can be made using five resistors each of 1/2 Ohm?
A) 1/10 Ohm
B) 1/25 ohm
C) 10 ohm
D) 2 ohm
Question 3 Which of the following statement is incorrect? ?
A) For every hormone there is a gene
B) For production of every enzyme there is a gene
C) For every molecule of fat there is a gene
D) For every protein there is a gene