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Shubham G.

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Physical Chemistry

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Question:

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is (A) Br2(g) (B) Cl2(g) (C) H2O(g) (D) CH4(g)

Shubham G.

Answer:

B The standard molar enthalpy of formation of elements in standard state is zero. For chlorine standard state is gas. Br2 in standard state is liquid. H20 is liquid. Ch4 is CO2+H20

Organic Chemistry

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Question:

How is aldehyde different from a ketone?

Shubham G.

Answer:

An aldehyde molecule has a carbonyl group -(C=0)- at the end of a carbon chain. A ketone has a carbonyl group -(C=0)- inside a carbon chain.

Trigonometry

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Question:

As trignometry is all about identity relations, so PROOV: tan^2(x) - sin^2(x) = tan^2(x) sin^2(x)

Shubham G.

Answer:

tan^2(x) - sin^2(x) = sin^2(x) / cos^2(x) - sin^2(x) = [ sin^2(x) - cos^2(x) sin^2(x) ] / cos^2(x) = sin^2(x) [ 1 - cos^2(x) ] / cos^2(x) = sin^2(x) sin^2(x) / cos^2(x) = sin^2(x) tan^2(x)

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