ESSENTIALS OF CHEMISTRY X>Chapter 8 - Sample Paper-3>Sample Paper-3>Q 4

HARD

10th CBSE

IMPORTANT

Earn 100

Write the chemical name and formula of bleaching powder. How is it prepared?

Important Questions on Sample Paper-3

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 8 - Sample Paper-3>Sample Paper-3>Q 5

What would you observe when calcium oxide is added to water? Write the reaction involved.

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 8 - Sample Paper-3>Sample Paper-3>Q 5

What would you observe when sodium is heated in oxygen? Write the reaction involved.

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 8 - Sample Paper-3>Sample Paper-3>Q 6

Based on the group valency of elements, state the formula for the following giving justification for each.
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with an element of group 16.

MEDIUM

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 8 - Sample Paper-3>Sample Paper-3>Q 7

Complete the following reaction:

${CH}_{4} + O_{2} \to$

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 8 - Sample Paper-3>Sample Paper-3>Q 7

Complete the following reaction:

$C_{2} H_{5} OH \overset{Hot conc . H_{2} {SO}_{4}}{\to}$

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 8 - Sample Paper-3>Sample Paper-3>Q 7

Complete the following reaction:

${CH}_{3} COOH + NaOH \to$

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 8 - Sample Paper-3>Sample Paper-3>Q 8

Design an activity to show a decomposition reaction in which light is used to decompose a reactant. Write chemical equation of the reaction and state its one use.

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 8 - Sample Paper-3>Sample Paper-3>Q 9

List two differences between calcination and roasting.