Manganese salt + PbO₂ + conc. HNO₃ → the solution acquires purple colour. The colour is due to

• Mn(NO₃)₂

• Pb(NO₃)₂

• HMnO₄

• MnO

552.

Acidified solution of chromic acid on treatment with H₂O₂ yields

• CrO₃ + H₂O + O₂

• Cr₂O₃ + H₂O + O₂

• CrO₅ + H₂O

• H₂Cr₂O₇ + H₂O + O₂

German silver contains which following metals?

• Cu, Zn

• Fe, Zn

• Zn, Fe, Ni

• Cu, Zn, Ni

Which one of the following lanthanide ions does not exhibit paramagnetism?

• Lu³⁺

• Ce³⁺

• Eu³⁺

• Yb³⁺

What is the change in the oxidation state of Mn in the reaction of MnO${}_4^{-}$ with H₂O₄ in acidic medium?

• 7 ➔4

• 6➔4

• 7➔2

• 6➔2

The following reaction occurs in acidic medium KMnO₄ + 8H⁺ + 5e^- → K⁺ + Mn²⁺ + 4H₂O. What is the equivalent weight of KMnO₄ ?

(Molecular weight of KMnO₄ = 158)

• 79.0

• 31.6

• 158.0

• 39.5

Which of the following material is known as lunar caustic?

• AgCl

• AgNO₃

• NaOH

• NaNO₃

The lanthanide ion that would show colour is :

• Lu³⁺

• Sm³⁺

• La³⁺

• Gd³⁺

The maximum number of possible oxidation states of actinoides are shown by-

• Neptunium (Np) and plutonium (Pu)

• Nobelium (No) and lawrencium (Lr)

• Berkelium (Bk) and californium (Cf)

• Actinium (Ac) and throrium (Th)

The maximum possible denticities of a ligand given below towards a common transition and inner-transition metal ion, respectively, are :

• 8 and 8

• 6 and 8

• 8 and 6

• 6 and 6