(A)

Cu + Pb

(B)

Cu + Sn

(C)

Cu + Zn

(D)

Cu + Ni

(A)

Ti⁴⁺

(B)

Cu⁺

(C)

Zn^2-

(D)

Cr³⁺

(A)

TiO > FeO > VO > CrO

(B)

TiO > VO > CrO > FeO

(C)

VO >CrO >TiO >FeO

(D)

CrO >VO >FeO>TiO

(A)

(n-2) f^1-14(n-1)s² p⁶d^0-1ns²

(B)

(n-2) f^10-14(n-1)d^0-1ns²

(C)

(n-2) f^0-14 (n-1)d¹⁰ns2

(D)

(n-2)d^0-1 (n-1) f^1-14 ns²

(A)

Zr and Yt have about the same radius

(B)

Zr and Nb have similar oxidation state

(C)

Zr and Hf have about the same radius

(D)

Zr and Zn have the same oxidation state

(A) There is a decrease in the radii of the atoms or ions as one proceeds from La or Lu.

(B)Lanthanide contraction is the accumulation of successive shrinkages

(C)As a result of lanthanide contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.

(D)Shielding power of 4f electrons is quite weak

(A)

K₂[Cu(CN)₄]

(B)

K₃[Cu(CN)₄]

(C)

Cu(CN)₂

(D)

Cu[K Cu(CN)₄]

(A)

Cr + Ni

(B)

Cr + Zn

(C)

Zn + Pb

(D)

Fe + Cr + Ni

(A)

Gold

(B)

Silver

(C)

Nickel

(D)

Iron

(A)

copper is liberated at cathode, sulphur at anode

(B)

copper is liberated at cathode, oxygen at anode

(C)

sulphur is liberated at cathode, oxygen at anode

(D)

oxygen is liberated at cathode, copper at anode