JEE Main 2022 · 27 Jun · Shift 1 · Chemistry Q87

← JEE Main 2022 · 27 Jun · Shift 1

ChemistryInteger+4 / -1Question 87 of 90

The number of statement(s) correct from the following for Copper (at. no. 29) is/are ______.

(A) Cu(II) complexes are always paramagnetic

(B) Cu(I) complexes are generally colourless

(D) In Fehling solution, the active reagent has Cu(I)

Your answer

Answer and worked solution

Official answer: 3

Check each. (A) Cu(II) is $d^9$ , always one unpaired electron ✓. (B) Cu(I) is $d^{10}$ , generally colourless ✓. (C) Cu(I) is easily oxidised (and disproportionates in water) ✓. (D) Fehling's solution contains Cu(II) ✗.

Three correct.

Answer: 3

Topics:Transition element properties Magnetic properties and colour

← Previous question Next question →

JEE Main 2022 · 27 Jun · Shift 1, Chemistry question 87