The organic compound having a triple carbon-carbon covalent bond is:

1. C₃H₄
2. C₃H₆
3. C₃H₈
4. C₄H₁₀

Write the balanced chemical equation to prepare ammonia gas in the laboratory by using an alkali.

Identify the salts P and Q from the observations given below:

1.  On performing the flame test salt P produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate
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Prove that $(1 + \cot\theta - \csc\theta)(1+\tan\theta+\sec\theta) = 2$

State any one condition when the Parliament can legislate on subjects in the State List.

A company with 500 shares of nominal value ₹ 120 declares an annual dividend of 15%. Calculate:

1. the total amount of dividend paid by the company.
2. annual income of Mr. Sharma who holds 80 shares of the
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Read the extract given below and answer the questions that follow:

Duke: You hear the learn’d Bellario, what he writes:
And here, I take it, is the doctor come.

[Enter Portia, dressed like a Doctor of...

Give a reason for each of the following: Goa receives heavier rainfall than Puducherry.

If 150 cc of gas A contains X molecules, how many molecules of gas B will be present in 75 cc of B?

1. The gases A and B are under the same conditions of temperature and pressure.
2. Name the law on which
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Calculate the effective resistance across AB:

State your observations when

Dilute Hydrochloric acid is added to Copper carbonate.

Given below is a representation of a kind of pollution. Study the same and answer the questions that follow: 

1. Name the kind of pollution.
2. List any three common sources of this pollution.
3. Mention three
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There are 25 discs numbered 1 to 25. They are put in a closed box and shaken thoroughly. A disc is drawn at random from the box. Find the probability that the number on the disc is:

1. an odd number
2. divisible
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Mention two causes of soil erosion in India.

Electrovalent compounds have __________ (high / low) melting points.

A compound with low boiling point is:

1. Sodium chloride
2. Calcium chloride
3. Potassium chloride
4. Carbon tetrachloride