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Consider the following… (Class 10 Science 2024, Q7)

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ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 7

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, section A, question 7, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q7 · 1 mark · MCQCarbon and its Compounds

Consider the following statements about homologous series of carbon compounds :
(a) All succeeding members differ by unit.
(b) Melting point and boiling point increases with increasing molecular mass.
(c) The difference in molecular masses between two successive members is 16 u.
(d) and are NOT the successive members of alkyne series.

The correct statements are –

  1. (A)(a) and (b)
  2. (B)(b) and (c)
  3. (C)(a) and (c)
  4. (D)(c) and (d)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Work out the mass of one unit.

Hint 2

Check whether and both fit the formula .

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (a) is true: successive members differ by a unit. (b) is true: melting and boiling points rise as molecular mass increases.

    ½ mark

  2. (c) is false: the mass difference is u, not 16 u. (d) is false: and are successive alkynes. So the correct statements are (a) and (b), option (A).

    ½ mark

Answer: (a) and (b): option (A)

Where the marks are

  • Selects option (A) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Carbon and its Compounds, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/2/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.