WB JEE 2024 | d and f Block Elements Question 2 | Chemistry

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WB JEE 2024

MCQ (Single Correct Answer)

-0.25

Which of the following species exhibits both LMCT and paramagnetism?

$$ \mathrm{MnO}_4^{2-} $$

$$ \mathrm{MnO}_4^{-} $$

$$ \mathrm{Cr}_2 \mathrm{O}_7^{2-} $$

$$ \mathrm{CrO}_4^{2-} $$

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

A solution of NaNO₃, when treated with a mixture of Zn dust and 'A' yields ammonia. 'A' can be

caustic soda

dilute sulphuric acid

concentrated sulphuric acid

sodium carbonate

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

The reaction for obtaining the metal (M) from its oxide (M₂O₃) ore is given by

$${M_2}{O_3}(s) + 2Al(l)\buildrel {Heat} \over \longrightarrow A{l_2}{O_3}(l) + 2M(s)$$, (s = solid, l = liquid) in that case, M is

copper

calcium

iron

zinc

WB JEE 2018

MCQ (Single Correct Answer)

-0.33

At room temperature, the reaction between water and fluorine produces

HF and H₂O₂

HF, O₂ and F₂O₂

F^$$-$$, O₂ and H⁺

HOF and HF

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