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JEE Main 2022 (Online) 29th June Morning Shift
Numerical  +4  -1
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The number of terminal oxygen atoms present in the product B obtained from the following reaction is _____________.

FeCr2O4 + Na2CO3 + O2 $$\to$$ A + Fe2O3 + CO2

A + H+ $$\to$$ B + H2O + Na+

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2
JEE Main 2022 (Online) 29th June Morning Shift
Numerical  +4  -1
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An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is _____________ B.M. (Nearest integer)

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3
JEE Main 2022 (Online) 27th June Morning Shift
Numerical  +4  -1
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The number of statements 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

(C) Cu(I) is easily oxidized

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

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4
JEE Main 2022 (Online) 26th June Morning Shift
Numerical  +4  -1
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Bengali

The spin-only magnetic moment value of the most basic oxide of vanadium among V2O3, V2O4 and V2O5 is _____________ B.M. (Nearest integer)

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