Gun metal is an alloy of:
1.Cu and Al
2.Cu and Sn
3.Cu, Zn and Sn
4.Cu, Zn and Ni
Posted Date:-2021-03-08 07:03:46
The pair that has similar atomic radii is
1.Mn and Re
2.Ti and Hf
3.Sc and Ni
4.Mo and W
Posted Date:-2021-03-08 07:03:46
According to IUPAC nomenclature sodium nitroprusside dihydrate is named as
1.Sodium pentacyanonitrosylferrate (III)
2.Sodium nitroferrocyanide
3.Sodium nitroferricyanide
4.Sodium pentacyanonitrosylferrate (II)
Posted Date:-2021-03-08 07:03:46
In Fe(CO)5, the Fe-C bond possesses:
1.ionic character
2.sigma character only
3.pi character
4.both sigma and pi characters
Posted Date:-2021-03-08 07:03:46
Silver nitrate produces a black stain on the skin due to
1.being a strong reducing agent
2.its corrosive action
3.formation of complex compound
4.its reduction to metallic silver
Posted Date:-2021-03-08 07:03:46
The number of unpaired electrons in gaseous species of Mn3+, Cr3+ and V3+ respectively are:
1.4, 4 and 2
2.3, 3 and 2
3.4, 3 and 2
4.3, 3 and 3
Posted Date:-2021-03-08 07:03:46
When potassium ferrocyanide crystals are heated with concentrated sulphuric acid, the gas evolved is
1.sulphur dioxide
2.ammonia
3.carbon monoxide
4.carbon dioxide
Posted Date:-2021-03-08 07:03:46
Which of the following products are obtained when Na2CO3 is added to a solution of copper sulphate?
1.Basic copper carbonate , sodium sulphate and CO2
2.Copper hydroxide, sodium sulphate and CO2
3.Copper carbonate, sodium sulphate and CO2
4.Copper carbonate and sodium sulphate
Posted Date:-2021-03-08 07:03:46
Which one of the following elements shows the maximum number of different oxidation states in its compounds?
1.Eu
2.La
3.Cd
4.Am
Posted Date:-2021-03-08 07:03:46
Zinc and mercury do not show variable valency like d-block elements because
1.they are soft
2.their d-shells are complete
3.they have only two electrons in the outermost subshell.
4.their d-shells are incomplete
Posted Date:-2021-03-08 07:03:46