D and F Block Elements

CrO₃ dissolves in aqueous NaOH to give

Options

(a) CrO₄²⁻ (b) Cr(OH)₃⁻ (c) Cr₂O₇²⁻ (d) Cr(OH)₂

Correct Answer:

CrO₄²⁻

Explanation:

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

On the extraction of iron, the slag produced is

Options

(a) CO (b) FeSiO₃ (c) MgSiO₃ (d) CaSiO₃

Correct Answer:

CaSiO₃

Explanation:

In the extraction of iron, limestone which acts as flux, decomposes […]

Aufbau principle does not give the correct arrangement of filling up of atomic orbitals in

Options

(a) Cu and Zn (b) Co and Zn (c) Mn and Cr (d) Cu and Cr

Correct […]

How many FeSO₄.7H₂SO₄ will be oxidised by an acidified solution containing 9.48 g KMnO₄

Options

(a) 83.4 g (b) 16.7 g (c) 1.67 g (d) 8.3 g

Correct Answer:

83.4 g

Explanation:

Balanced […]

Which of the following cations has the maximum number of unpaired electrons

Options

(a) Mn²⁺ (b) Fe²⁺ (c) Co²⁺ (d) Ni²⁺

Correct Answer:

Mn²⁺

Explanation:

No explanation available. Be the first to write […]

A mixture of two salts is not soluble in water but dissolves completely in dilute hydrochloric acid to form a colourless solution. The mixture could be

Options

(a) AgNO₃ and KBr (b) BaCO₃ […]