EASY
10th CBSE
IMPORTANT
Earn 100

A metal oxide on being heated with carbon does NOT produce carbon dioxide. Give a possible explanation for this behaviour of the metal oxide.

Important Questions on Metals and Non-metals

HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 20
In the formation of a compound, X loses electrons and Y gains electrons. Which of the following properties is not shown by the compound?
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 21
Silver ornaments become black on prolong exposure to air, it is due to the formation of:
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 22

The electronic configurations of three elements X, Y and Z are as follows:

X - 2, 8

Y - 2, 8, 7

Z - 2, 8, 2

Which of the following is correct?

HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 23
A thin plate of zinc metal is placed in a beaker containing aqueous ferrous sulphate solution. The zinc plate is taken out after 15 mins. The colour of solution changes to:
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 24
The correct reactivity order is:
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 25
Which of the following alloys does not contain any copper?
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 26
An acid used by goldsmith for dissolving gold is
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 27
Which of the following is a carbonate ore?