D and F Block Elements Archives

Platinum, palladium and iridium are called noble metals because Options (a) Alfred Noble discovered them (b) they are shining lustrous…

6 years ago

In Cu-ammonia complex, the state of hybridization of Cu²⁺ is Options (a) sp³ (b) d³ (c) sp²f (d) dsp² Correct…

6 years ago

Chinese white is Options (a) ZnO (b) ZnCO₃ (c) ZnS (d) ZnS + BaSO₄ Correct Answer: ZnOExplanation:No explanation available. Be…

6 years ago

Reaction of solid KMnO₄ with conc.H₂SO₄ produces manganese heptoxide (Mn₂O₇) in Options (a) solution state (b) solid state (c) fine…

6 years ago

The amphoteric oxide is Options (a) Mn₂O₇ (b) MnO (c) MnO₂ (d) Mn₂O₃ Correct Answer: MnO₂Explanation:(i) Oxides in lower oxidation…

6 years ago

A yellow metal sulphide is Options (a) CuS (b) NiS (c) CdS (d) ZnS Correct Answer: CdS Explanation: The colour…

6 years ago

Which is not the property transition elements Options (a) Coloured salts (b) Variable valency (c) Fixed valency (d) coordinate complex…

6 years ago

Oxidation number of chromium in Na₂Cr₂O₇ is Options (a) 2 (b) 4 (c) 3 (d) 6 Correct Answer: 6Explanation:Oxidation number…

6 years ago

The number of unpaired electron in Mn²⁺ is Options (a) 1 (b) 4 (c) 3 (d) 5 Correct Answer: 5Explanation:No…

6 years ago

Which of the following statement concerning lanthanides elements is fals Options (a) All lanthanides are highly dense metals (b) More…

6 years ago