Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETChemistryd and f Block Elements

Which of the following statement is correct when a mixture of NaCl and K 2 C r 2 O 7 is gently warmed with conc. H 2 S O 4 ? 1 . a deep red vapour is evolved 2 . The vapour when passed into NaOH solution gives a yellow solution of N a 2 Cr O 4 3 . chlorine gas is evolved 4 . chromyl chloride is formed

Options

  1. A1, 2, 4
  2. B1, 2 ,3
  3. C2, 3, 4
  4. Dall are correct

Correct answer

A. 1, 2, 4

Step-by-step solution

4NaCl + K 2 C r 2 O 7 + 6 H 2 S O 4 conc . → 2KHS O 4 + 4NaHS O 4 + 2Cr O 2 C l 2 orange red Chromyl chloride + 3 H 2 O Chromyl chloride vapours when passed through NaOH solution gives a yellow solution of N a 2 Cr O 4 . Cr O 2 C l 2 + 4NaOH → N a 2 Cr O 4 + 2NaCl + 2 H 2 O

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because : 2026The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of Ce =58 , Nd =60 , Tb =65 and Ho =67 ) 2026The green paramagnetic species formed by heating KMn O₄ at 513 K is 2026The calculated 'spin-only' magnetic moment of Ti ²⁺ (3d^2) is : 2026Match List I with List II : List I (Transition metal/compound/complex) List II (Catalytic Role) A. V ₂ O ₅ I. Preparation of ammonia from N ₂/ H ₂ mixture B. Fe II. Polymerisation 2026Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Generally, 3d transition metals have high melting points. Reas 2026Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number of unpaired electrons in a Cr ²⁺ ion ( Z 2025Which of the following set of ions act as oxidising agents? 2024 Full d and f Block Elements list All NEET PYQs