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d and f Block Elements

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Q JEE MAIN 2022
The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is ______.
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Q JEE MAIN 2022
Which of the following has least tendency to liberate $\mathrm{H}_2$ from mineral acids?
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Q JEE MAIN 2022
The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are
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Q JEE MAIN 2022
The metal that is not extracted from its sulphide ore is :
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Q JEE MAIN 2022
In neutral or alkaline solution, $\mathrm{MnO}_4^{-}$ oxidises thiosulphate to:
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Q JEE MAIN 2022
Which of the following 3d-metal ion will give the lowest enthalpy of hydration $\left(\Delta_{\text {hyd }} \mathrm{H}\right)$ when dissolved in water?
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Q JEE MAIN 2022
Which of the following pair is not isoelectronic species? (At. no. Sm, 62; Er, 68: Yb, 70: Lu, 71; Eu, 63: Tb, 65; Tm, 69)
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Q JEE MAIN 2022
The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :
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Q JEE MAIN 2022
In metallurgy the term "gangue" is used for:
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Q JEE MAIN 2022
The dark purple colour of KMnO4 disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese...
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