English Medium कक्षा १० - CBSE Question Bank Solutions for Science

The usual disease caused by the excessive drinking of alcohol over a long period of time is:
(a) diabetes
(b) cataract
(c) cirrhosis
(d) arthritis

Write the name and molecular formula of an organic compound having its name suffixed with 'ol' and having two carbon atoms in its molecule. Write balanced chemical equation to indicate what happens when this compound is heated with excess conc. H₂SO₄ and the name of main product formed. Also state the role of conc. H₂SO₄ in the reaction.

An organic compound 'P' is a constituent of wine. 'P' on reacting with acidified K₂Cr₂O₇ forms another compound 'Q'. When a piece of sodium is added to 'Q' a gas 'R' evolves which burns with a pop sound. Identify P, Q and R and write the chemical equations of the reactions involved.

What is meant by a functional group in carbon compounds?

Name the oxidising agent used for the conversion of ethanol to ethanoic acid. Distinguish between ethanol and ethanoic acid on the basis of (i) litmus test, (ii) reaction with sodium carbonate 

List in tabular form three physical and two chemical properties on the basis of which ethanol and ethanoic acid can be differentiated.

In a tabular form, differentiate between ethanol and ethanoic acid under the following heads:

(i) Physical state

(ii) Taste

(iii) NaHCO₃ test

(iv) Ester test

Write a chemical reaction to show the dehydration of ethanol.

With a labelled diagram describe an activity to show the formation of an ester.

Answer the following question.
Write the chemical formula and name of the compound which is the active ingredient of all alcoholic drinks. List its two uses.

Write the chemical equation and name of the product formed when this compound reacts with -
(i) Sodium metal  
(ii) hot concentrated sulphuric acid

Answer the following question.
Why is the conversion of ethanol to ethanoic acid considered an oxidation reaction? Write the oxidizing agent used in the reaction involved.

Draw the structures for ethanol.

3 mL of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added to the first drop by drop to this solution, then in excess.

1. How is a 5% solution of KMnO₄ prepared?
2. State the role of alkaline potassium permanganate in this reaction. What happens on adding it in excess?
3. Write the chemical equation of this reaction.

Write the chemical equation for the following:

Oxidation of ethanol

Ethanol is also known as which of these?

The organic compounds having functional group are known as ______.

What is denatured alcohol?

Ethanol reacts with sodium and forms two products. These are