In the brown ring test for the nitrate ion, the brown colour is due to
Options
(a) [Fe(H₂O)₅NO]²⁺ (b) [Fe(H₂O)₅NO]³⁺ (c) [Fe(H₂O)₆]⁺ (d) [Fe(H₂O)₅NO₂]²⁺
Correct Answer:
[Fe(H₂O)₅NO]²⁺
Explanation:
When an aqueous solution of […]
Lanthanide contraction is due to increase in
Options
(a) shielding by 4f electrons (b) atomic number (c) effective nuclear charge (d) size of 4f orbital
Correct Answer:
effective nuclear charge
Explanation:
As we […]
Many transition metals and their compounds exhibit
Options
(a) perimagnetic behaviour (b) vander waal’s behaviour (c) paramagnetic behaviour (d) diamagnetic behaviour
Correct Answer:
paramagnetic behaviour
Explanation:
No explanation available. Be the first to […]
The term platforming is
Options
(a) platinum painting (b) flat sheet of platinum (c) platinum coating (d) platinum used as a catalyst
Correct Answer:
platinum used as a catalyst
Explanation:
Platforming is the catalytic […]
In the electrolytic refining of zinc
Options
(a) graphite is at the anode (b) the impure metals is at the cathode (c) the metal ion gets reduced at the anode (d) acidified zinc […]
All Cu(II) halides are known except the iodide. The reason for it is that
Options
(a) iodide is a bulky ion (b) Cu²⁺ oxidizes iodide to iodine (c) Cu²⁺ (aq) has much more […]
Which one of the following statements about transition elements is incorrect
Options
(a) They show variable oxidation states (b) All the ions are coloured (c) They exhibit diamagnetic and paramagnetic properties (d) They […]
Which of the following is the green coloured powder produced when ammonium dichromate is used in fire works
Options
(a) Cr (b) CrO₃ (c) Cr₂O₃ (d) CrO(O₂)
Correct Answer:
Cr₂O₃
Explanation:
No explanation […]
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 […]
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