Listed here is the reactivity of certain metals: Metal Reaction with air Reaction with water Reaction with dilute acids Gold Does not oxidise or burn No reaction No reaction sodium Burns vigorously to form an oxide Reacts on heating Reacts to produce hydrogen Zinc Burns to form an oxide Reacts on heating Reacts to produce hydrogen platinum No reaction Does not dissolve or reacts No reaction From the list above, identify the metal(s) that are likely to be found in a pure state in the Earth's Crust.

Metals that are very stable, i.e., metals that do not react with air, water, and dilute acids are likely to be found in a pure state in the Earth's Crust. From the given list name of the metals that are likely to be found in a pure state in the Earth's Crust are: Gold Platinum Other metals like sodium and zinc are highly reactive in nature and hence, cannot be found in pure state in nature.

E M B I B E

Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 82

MEDIUM

10th CBSE

IMPORTANT

Earn 100

Smriti is looking at herself in a convex mirror in a science museum, standing $2 m$ away from the mirror. Her image appears to be around half her actual height. Estimate the focal length of the mirror.

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 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 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 29

Generally, alloys are homogeneous mixture of a metal with a metal or non-metal. Which among the following alloys has a non-metal?

HARD

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 30

What is not true about calcination?

MEDIUM

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 16

Read the following statements:

(P)

Stainless steel does not rust.

(Q)

Iron, nickel and chromium form an alloy.
Does statement

(Q)

present a valid explanation for statement

(P)

? Justify your answer.

MEDIUM

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 3 - Metals and Non-metals>Exercise>Q 13

Listed here is the reactivity of certain metals:

Metal	Reaction with air	Reaction with water	Reaction with dilute acids
Gold	Does not oxidise or burn	No reaction	No reaction
sodium	Burns vigorously to form an oxide	Reacts on heating	Reacts to produce hydrogen
Zinc	Burns to form an oxide	Reacts on heating	Reacts to produce hydrogen
platinum	No reaction	Does not dissolve or reacts	No reaction