MEDIUM
10th CBSE
IMPORTANT
Earn 100

What is the nature of the chemical reaction when water is added to quick lime?

Important Questions on Chemical Reactions and Equations

MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 1 - Chemical Reactions and Equations>Test Your Knowledge>Q 16

Ferrous sulphate decomposes with the evolution of a gas having characteristic smell of burning sulphur. Write the chemical equation involved and identify the reaction.

MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 1 - Chemical Reactions and Equations>Test Your Knowledge>Q 17
Explain why respiration is an exothermic reaction.
MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 1 - Chemical Reactions and Equations>Test Your Knowledge>Q 17
When blue salt of copper sulphate is heated, it becomes colourless. Why?
MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 1 - Chemical Reactions and Equations>Test Your Knowledge>Q 18
Identify the oxidizing and reducing agents in the following reaction: H2O+F2→HF+HOF
MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 1 - Chemical Reactions and Equations>Test Your Knowledge>Q 18

Identify the oxidising and reducing agents in the following reaction.

ZnO+H2→Zn+H2O

MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 1 - Chemical Reactions and Equations>Test Your Knowledge>Q 19
An element 'A' which is an oxide of a group 2 element, is used in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify 'A' and also write the chemical reactions involved.
MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 1 - Chemical Reactions and Equations>Test Your Knowledge>Q 20
Zinc replaces hydrogen gas when reacted with dilute hydrochloric acid whereas copper does not. Explain why?
MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 1 - Chemical Reactions and Equations>Test Your Knowledge>Q 21
A silver article generally turns black when kept in open for days. The article when rubbed with toothpaste again starts shining.
(a) Why does silver article turn black?