${\mathrm{CrO}}_3$ dissolves in aqueous $\mathrm{NaOH}$ to give

Important Questions on The d- and f-Block Elements

HARD

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-3>Q 5

${\mathrm{Fe}}_3{\mathrm{O}}_4$ is mixed oxide of $\mathrm{FeO}$ and ${\mathrm{Fe}}_2{\mathrm{O}}_3$.

MEDIUM

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-3>Q 6

Acidic potassium permanganate is used in organic chemistry under the name Baeyer's reagent.

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-3>Q 7

No rusting takes place in absence of moisture.

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-3>Q 8

Copper dissolves in hydrochloric acid.

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-3>Q 9

Bivalent ion of _____ shows maximum paramagnetic character among the bivalent ions of first transition on series. (write symbol)

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-3>Q 10

The salts ${\mathrm{FeSO}}_4.7{\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{ZnSO}}_4.7{\mathrm{H}}_2\mathrm{O}$ are _____. (isodiaphers, isostructural, isoelectronic, isotopes)

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Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-3>Q 11

Among the ${\mathrm{CuCl}}_2,{\mathrm{CaCl}}_2$ and ${\mathrm{CdCl}}_2$, the species ${\mathrm{CuCl}}_2$ is _____ in character. (paramagnetic, diamagnetic, anti-ferromagnetic)

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-3>Q 12

The chromate ion in acidic medium changes to _____. (write name)