Applications of Metals and Nonmetals

Q. Why graphite is used as moderator in nuclear reactors?

Q. Which non-metal is essential for our life and all living beings which we inhale during breathing?​

Q.

Give reason: Why graphite is used for making electrodes in dry cell.

Q.

Name two non-metals which are used in fireworks (crackers, etc.).

Q. Question 16
Which non-metal is used to disinfect water?

Q.

Match the substances given in column A with their uses given in column B:

$\begin{array}{cccc}& A& & B\\ \left(i\right)& Gold& \left(a\right)& Thermometer\\ \left(ii\right)& Iron& \left(b\right)& Electricwires\\ \left(iii\right)& Aluminium& \left(c\right)& Wrappingfood\\ \left(iv\right)& Carbon& \left(d\right)& Jewellery\\ \left(v\right)& Copper& \left(e\right)& Machinery\\ \left(vi\right)& Mercury& \left(f\right)& Fuel\end{array}$

Q.

Find the odd one out and explain your choice.

(Hint: valency is not a criterion)

Sulphur, phosphorus, carbon, iodine.

Q. To enhance the property of a particular metal they are mixed with another metal or nonmetal. Such mixtures are called alloys.

1. False
2. True

Q. Where does hydrogen occur in a free state?

Q. Assertion [A]: Zinc is used in galvanisation of iron.
Reason [R]: Galvanisation increases the life of iron articles by protecting them from rusting.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is false but R is true.
4. A is true but R is false.

Q. Which one of the following is applied on wounds as an antiseptic?

1. Non-metals
2. Metalloids
3. Metal oxides
4. Metals

Q. Food cans are generally coated with tin rather than zinc because

1. zinc is more reactive
2. zinc has high boiling point
3. zinc is less reactive
4. zinc is expensive

Q.

Which non-metal is essential for our life and all living beings inhale it during breathing?

Q. Name two major non-metals which are present in fertilizers and enhance the growth of plants.​

Q.

Which of the following property is generally not shown by metals?

1. Electrical conduction

2. Sonorous in nature

3. Dullness

4. Ductility

Q.

What is fusible

Q.

Which metal is most commonly used for fertilizers?

1. Sodium

2. Potassium

3. Magnesium

4. Calcium

Q. Statement I: Metals are good thermal conductors.
Statement II: The handles of cooking pans are not made up of metals.

1. Only statement I is correct.
2. Only statement II is correct.
3. Both the statement are correct.
4. Both the statement are incorrect.

Q. Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties.​

Properties​	Metals​	Non-metals​
1. Appearance​	​	​
2. Hardness​	​	​
3. Malleability​	​	​
4. Ductility​	​	​
5. Heat Conduction​	​	​
6. Conduction of Electricity​	​	​

​

​

Q. Match column I with column II and select the correct option from the given codes.

Column I	Column II
P. Non-metal essential for respiration	(i) Nitrogen
Q. Non-metal used in fertilizers to enhance growth of plants	(ii) Chlorine
R. Non-metal used in water purification process	(iii) Iodine
S. Non-metal whose purple coloured solution is used as an antiseptic	(iv) Oxygen

1. P-(iv), Q-(i), R-(ii), S-(iii)
2. P-(ii), Q-(iv), R-(iii), S-(i)
3. P-(iii), Q-(i), R-(iv), S-(ii)
4. P-(i), Q-(iv), R-(ii), S-(iii)

Q.

Which of the following is most abundant metal on the earths crust?

1. Iron

2. Aluminium

3. Calcium

4. Oxygen

Q. Question 31
Find out the names of three metals and three non-metals from the box given as Fig.

Q.

What is anodizing? Can we only anodize aluminium?

If yes, why?

If no, give other examples (other than aluminium) to explain.

Q. Question 1
Among Zinc, Phosphorus, Sulpher and Oxygen which can be beaten into thin sheets?

Q.

The most abundant metal in the earths crust is :

1. Iron

2. Nickel

3. Aluminum

4. Sodium

Q. Which non-metal is used in the purification of water?

1. Sodium
2. Sulphur
3. Chlorine
4. Iodine

Q.

Mention the use of following non-metal.

(a) Oxygen. (b) Nitrogen.

Q.

16) Xenon and krypton are used in electric bulbs to slow down _______ of tungsten.

Q. The metal generally mixed with gold while making ornaments is:

1. zinc
2. iron
3. silver
4. copper

Q.

D. Write ‘True or ‘False’ for the following statements.

3. Nitrogen is a gaseous non-metal essential for respiration.