D and F Block Elements

Chinese white is

Options

(a) ZnO (b) ZnCO₃ (c) ZnS (d) ZnS + BaSO₄

Correct Answer:

ZnO

Explanation:

No explanation available. Be the first to write the explanation for this question by […]

Reaction of solid KMnO₄ with conc.H₂SO₄ produces manganese heptoxide (Mn₂O₇) in

Options

(a) solution state (b) solid state (c) fine powder (d) none of these

Correct Answer:

solution state

Explanation:

KMnO₄ on treatment […]

The amphoteric oxide is

Options

(a) Mn₂O₇ (b) MnO (c) MnO₂ (d) Mn₂O₃

Correct Answer:

MnO₂

Explanation:

(i) Oxides in lower oxidation states are basic in nature. (ii) Oxides in intermediate oxidation states […]

A yellow metal sulphide is

Options

(a) CuS (b) NiS (c) CdS (d) ZnS

Correct Answer:

CdS

Explanation:

The colour of sulphide of cadmium (belonging to II A group) is yellow.

Which is not the property transition elements

Options

(a) Coloured salts (b) Variable valency (c) Fixed valency (d) coordinate complex formation

Correct Answer:

Fixed valency

Explanation:

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Oxidation number of chromium in Na₂Cr₂O₇ is

Options

(a) 2 (b) 4 (c) 3 (d) 6

Correct Answer:

6

Explanation:

Oxidation number of chromium in Na₂Cr₂O₇ is +6. Oxidation number of Na = […]

The number of unpaired electron in Mn²⁺ is

Options

(a) 1 (b) 4 (c) 3 (d) 5

Correct Answer:

5

Explanation:

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