When soap is used for washing clothes with hard water, it reacts with the calcium and magnesium ions of hard water to form an insoluble precipitate known as scum. It sticks to the cloth during washing making the process difficult.

A compound ‘ X ’ on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound ‘ Y ’. ‘ X ’ also reacts with sodium metal to evolve a colourless gas ‘ Z ’. Identify ‘ X ’, ‘ Y ’ and ‘ Z ’. Write the equation of the chemical reaction of formation of ‘ Y ’ and also write the role of sulphuric acid in the reaction.

Compound X is CH 3 CH 2 OH -ethanol, which on heating with concentrated sulphuric acid at 443 K gives ethene, which is an unsaturated compound. Ethanol reacts with sodium metal to produce sodium ethoxide and hydrogen gas ' Z '. CH 3 CH 2 OH + Na → CH 3 CH 2 ONa + H 2 Chemical reaction of formation of Y is, CH 3 CH 2 OH Ethanol → 443 K Conc . H 2 SO 4 CH 2 = CH 2 Ethene + H 2 O Here, concentrated sulphuric acid acts as a dehydrating agent, it removes water molecule from ethanol.

E M B I B E

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Carbon and its Compounds>Exercise>Q 53

EASY

10th Uttar Pradesh Board

IMPORTANT

Earn 100

Draw the electron dot structure for Ethanoic acid.

Important Questions on Carbon and its Compounds

EASY

10th Uttar Pradesh Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Carbon and its Compounds>Exercise>Q 1

Successive members of homologous series differ by

MEDIUM

10th Uttar Pradesh Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Carbon and its Compounds>Exercise>Q 54

Write the equations for the combustion of methane and ethanol. What difference did you notice from both the equations?

MEDIUM

10th Uttar Pradesh Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Carbon and its Compounds>Exercise>Q 55

Name the products formed when ethanol burns in air. List two forms of energy that are liberated on burning ethanol.

MEDIUM

10th Uttar Pradesh Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Carbon and its Compounds>Exercise>Q 56

Why vegetable oils are considered healthy as compared to vegetable ghee? How are vegetable oils converted into vegetable ghee? Name and define the process involved.

MEDIUM

10th Uttar Pradesh Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Carbon and its Compounds>Exercise>Q 59

Explain the following term:

Substitution reaction

EASY

10th Uttar Pradesh Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Carbon and its Compounds>Exercise>Q 61

What is the difference between soaps and detergents?

MEDIUM