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100 most-expected CSIR‑NET chemistry questions

Organic, inorganic and physical — spread across thirty‑six chapters, and every single one carries the full worked reasoning rather than a letter in an answer key.

100
Questions
36
Chapters
100
Worked solutions
24
Pages

Three of them, in full

Answer shown, and the reasoning with it. Judge the other ninety‑seven by these.

Named Reactions

Sodium borohydride (NaBH₄) is a mild reducing agent that readily reduces:

  • ACarboxylic acids to alcohols
  • BAldehydes and ketones to alcohols
  • CAlkenes to alkanes
  • DNitriles to amines
B — Aldehydes and ketones to alcohols. NaBH₄ is a mild hydride source that reduces aldehydes and ketones to alcohols but is generally too mild to reduce carboxylic acids or esters (which need the stronger LiAlH₄).

Chemical Bonding

Which of the following molecules is non-polar?

  • AH₂O
  • BNH₃
  • CSO₂
  • DCO₂
D — CO₂. CO₂ is linear and symmetric, so its two C=O bond dipoles cancel, giving zero net dipole moment (non-polar). H₂O and NH₃ are bent/pyramidal and SO₂ is bent — all polar.

Group Theory

How many symmetry operations are in the C2v point group?

  • A2
  • B3
  • C4
  • D6
C — 4. C2v contains four operations: E (identity), C₂ (two-fold rotation), and two vertical mirror planes σv and σv'. (Order of the group = 4.)

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