Match column I with column II and select the correct option from the given codes. Column I Column II (a) A non-metal, essential for respiration (i) Graphite (b) A non-metal, the source of energy in Sun (ii) Silicon (c) A non-metal, good conductor of electricity (iii) Oxygen (d) A non-metal, used in semiconductors (iv) Hydrogen

(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)

(a) - (i), (b) - (ii), (c) - (iv), (d) - (iii)

(a) - (ii), (b) - (iii), (c) - (i), (d) - (iv)

(a)-(iv), (b) - (i), (c) - (ii), (d) - (iii)

Vidisha placed a copper wire in silver nitrate solution as shown in the figure. Which of the following represents the correct observation?

The colour of the solution turned blue and precipitate of solid silver was obtained.

Colour of solution turned green and copper wire turned blue.

There was no change in the colour of solution or colour of the wire.

Colour of the solution became silver and there was no change in the colour of copper wire.

MEDIUM

8th Foundation

IMPORTANT

Earn 100

An unknown metal $X$ when placed in copper sulphate solution, red-brown pieces of copper fall to the bottom of the test tube. When metal $X$ is placed in aluminium sulphate solution, no change is observed. Metal $X$ can be

50% studentsanswered this correctly

Important Questions on Metals and Non-Metals

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 4 - Metals and Non-Metals>EXERCISES>Q 4

Substance

X

reacts with dilute

HCl

violently,

Y

reacts slowly while

Z

does not react at all.

X, Y

and

Z

could be respectively

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 4 - Metals and Non-Metals>EXERCISES>Q 5

Which of the following reactions are possible?
(i)

Mg + {CuSO}_{4} \to {MgSO}_{4} + Cu

(ii)

Ca + {MgSO}_{4} \to {CaSO}_{4} + Mg

(iii)

Cu + {ZnSO}_{4} \to {CuSO}_{4} + Zn

(iv)

Fe + {MgSO}_{4} \to {FeSO}_{4} + Mg

EASY

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 4 - Metals and Non-Metals>EXERCISES>Q 6

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

Column I		Column II
(a)	A non-metal, essential for respiration	(i)	Graphite
(b)	A non-metal, the source of energy in Sun	(ii)	Silicon
(c)	A non-metal, good conductor of electricity	(iii)	Oxygen
(d)	A non-metal, used in semiconductors	(iv)	Hydrogen

EASY

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 4 - Metals and Non-Metals>EXERCISES>Q 7

Which of the following statements is incorrect?

EASY

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 4 - Metals and Non-Metals>EXERCISES>Q 8

What will happen if you keep a solution of copper sulphate in an iron container for a few days? What is the reason for your observation?

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 4 - Metals and Non-Metals>EXERCISES>Q 9

Kanika takes a burning substance and collects the evolved vapours in a test tube, making sure that they do not escape. A small amount of water is added to the test tube. To the solution obtained, a few drops of blue litmus solution are added. The litmus solution turns red. Which of the following could be the burning substance?

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 4 - Metals and Non-Metals>EXERCISES>Q 10

Vidisha placed a copper wire in silver nitrate solution as shown in the figure.

Question Image

Which of the following represents the correct observation?

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 4 - Metals and Non-Metals>EXERCISES>Q 11

Read the following statements carefully and identify $X, Y$ and $Z$ respectively.
(i) $X$ is stored under kerosene.
(ii) $Y$ catches fire on exposure to air and stored in water.
(iii) $Z$ reacts with steam.

An unknown metal X when placed in copper sulphate solution, red-brown pieces of copper fall to the bottom of the test tube. When metal X is placed in aluminium sulphate solution, no change is observed. Metal X can be

Important Questions on Metals and Non-Metals

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An unknown metal $X$ when placed in copper sulphate solution, red-brown pieces of copper fall to the bottom of the test tube. When metal $X$ is placed in aluminium sulphate solution, no change is observed. Metal $X$ can be