501.

Which one of the following transition metal ion is coloured?

• Cu⁺

• Zn²⁺

• Sc³⁺

• V⁴⁺

Correct order of paramagnetism is

• Mn>Cr> Zn

• Fe> Zn> Cr

• Cr> Fe> Zn

• Zn >Mn> Fe

The aqueous ferrous ion is green, ferric ion is pale yellow. The aqueous chromic ion is green, hence the colour of chromate ion must be

• orange

• colourless

• yellow

• red

In acidic medium, the equivalent weight of  K₂Cr₂O₇ (Mol. wt. = M) is

• M

• M/2

• M/3

• M/6

${}_{92}{}^{235}\mathrm{U}$ belongs to IIIB group of the Periodic.When it loses one α -particle, the new element will belong to the group.

• I B

• V B

• I A

• III B

Which set of elements have nearly the same atomic radii ?

• F, Cl, Br, I

• Na, K, Rb, Cs

• Fe, Co, Ni, Cu

• Li, Be, B, C

When MnO₂ is heated with PbO₂ and conc. HNO₃ pink colour is obtained due to formation of

• KMnO₄

• HMnO₄

• Pb(MnO₄)₂

• PbMnO₂

Which of the following ions has the highest magnetic moment ?

• Zn²⁺

• Ti³⁺

• Sc³⁺

• Mn²⁺

In nitroprusside ion, the iron and NO as Fe²⁺ and NO⁺ rather than Fe³⁺ and NO. These forms can be differentiated by

• estimating the concentration of iron

• measuring the concentration of CN^-

• measuring the solid state magnetic moment

• thermally decomposing the compound

Which of the following compounds gives PELIGOT's salt with chromyl chloride?

• Borax

• Oxone

• Sylvine

• Trona