Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why.

Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not because zinc is more reactive than hydrogen and hence, displace it and the reaction takes place. Copper is less reactive when compared to hydrogen and hence cannot displace it. The same reaction does not occur with copper metal because copper is less reactive than hydrogen.

Compound X and aluminium are used to join railway tracks. Identify the compound.

The compound X is an iron. It is used in the joining process of railway tracks and aluminium is iron (III) oxide. In this reaction, more reactive aluminium metal replaces iron from its oxide to produce molten iron used to join the railway tracks.

Zinc or aluminium do not corrode because _____.

they react with moist air to form a very thin layer of oxides which is very sticky and hard

they do not react with moist air

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 3 - Metals and Non-metals>meghalaya-2020>Q 19

MEDIUM

10th Meghalaya Board

IMPORTANT

Earn 100

State the differences between rusting and rust.

Important Questions on Metals and Non-metals

HARD

10th Meghalaya Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 3 - Metals and Non-metals>meghalaya-2019>Q 1

Draw a geometric diagram for the formation of

{MgCl}_{2}

from magnesium and chlorine by transfer of electrons.

HARD

10th Meghalaya Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 3 - Metals and Non-metals>meghalaya-2018>Q 2

Which process is used for the enrichment of (i) sulphide ores and (ii) oxide ores?

MEDIUM

10th Meghalaya Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 3 - Metals and Non-metals>meghalaya-2019>Q 3

What is the concentration of ore?

HARD

10th Meghalaya Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 3 - Metals and Non-metals>meghalaya-2019>Q 4

Explain the froth floatation process with a neat labelled diagram.

HARD

10th Meghalaya Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 3 - Metals and Non-metals>meghalaya-2020>Q 5

Name the process of obtaining pure metal from an impure metal through electrolysis. If you have to refine copper using this process, mention the materials used as (i) anode, (ii) cathode and (iii) electrolyte.

MEDIUM

10th Meghalaya Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 3 - Metals and Non-metals>meghalaya-2020>Q 6

Give the advantages of the electrolytic refining process.

MEDIUM

10th Meghalaya Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 3 - Metals and Non-metals>meghalaya-2018>Q 7

Which of the following metals is the most abundant in the earth's crust?

MEDIUM

10th Meghalaya Board