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Subject - Chemistry:

Basics

MCQ - 67-2253

Question:

Which one of the following is a correct reaction of concentrated sulphuric acid?

  1. It always gives hydrogen when reacting with metals
  2. It can dehydrate C2H5OH to CH2=CH2
  3. it gives sulphur dioxide and hydrogen chloride when
  4. It can dehydrate C2H5OH to CH2=CH2

Correct Answer: B

Explanation:

concentrated H2SO4 is a very strong dehydrating agent, removing atoms of

hydrogen and oxygen in the ratio of 2:1 from organic compounds (in the form of H2O).

A: metals below H in the reactivity series does not give H2-.

C: SO2- is not evolved.

D: Reactive metals give H2 instead of So2-

E: it does not oxidise Cl- to Cl2-

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645 MCQ for effective preparation of the test of Basics of Chemistry section.

Read the MCQ statement: Which one of the following is a correct reaction of concentrated sulphuric acid? , keenly and apply the method you have learn through the video lessons for Basics to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 67-2253.

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