Read the following passage given below and answer the question.
Production of electricity by thermal plants is not very efficient method. It is now possible to make cells in which reactants are fed continuously to the electrodes and products are also removed continuously. One of the most successful fuel cells is hydrogen fuel cell.
Hydrogen fuel cell is an :

Match List - I with List - II.

List - I	List - II
(A) \(XeF _6\)	(I) Disproportionation Reaction
(B) Liquid Helium	(II) Thermodynamically unstable
(C) \(FNO _2\)	(III) MRI
(D) \(O _3\)	(IV) Distorted octahedral

Choose the correct answer from the options given below :

Why do the actinoids exhibit a higher number of oxidation states than lanthanoids?

The spin-only magnetic moment of the Hexacyanomanganate(II) ion is __________ BM.

Answer the question on the basis of passage given below :
One of the notable features of the transition element is the great variety of oxidation states it may show in its compounds. The elements which give the greatest number of oxidation states occur in or near the middle of the series. Manganese, for example exhibits all the oxidation states from +2 to +7. The lesser number of oxidation states at the extreme ends is either due to losing or sharing of few electrons (Sc, Ti) or too many d electrons of higher valence. Early in the first series scandium (II) is virtually unknown and titanium (IV) which is more stable than Ti (III) or Ti (II). On the other end, the only oxidation state of zinc is \(+ 2\).
Oxidation state of scandium is

Number of ions produced on electrolysis of \([Co(NH_3)_6]Cl_3\) which gives 3 mol of AgCl on reacting with \(AgNO_3\), are:

Match List I with List II

LIST - I	LIST - II
A. Cubic cell	I. \(\alpha=\beta=\gamma=90^{\circ}\)
B. Monoclinic cell	II. \(\alpha=\beta=90^{\circ}, \gamma=120^{\circ}\)
C. Triclinic cell	III. \(\alpha=\gamma=90^{\circ}, \beta \neq 90^{\circ}\)
D. Hexagonal cell	IV. \(\alpha \neq \beta \neq \gamma \neq 90^{\circ}\)

Choose the correct answer from the options given below:

During ice age between __________ modern Homo sapiens arose.

Match List-I with List-II

List-I (Materials)	List-II (Band Gap (eV))
(A) Germanium	(I) 1.42 eV
(B) Gallium Arsenide	(II) > 3 eV
(C) Insulator	(III) 1.1 eV
(D) Silicon	(IV) 0.7 eV

Choose the correct answer from the options given below :

A rectangular loop ABCD made of uniform wire is a part of an electric circuit shown in the given figure. The length AD = BC = 5 mm. The sides AB and DC are long compared to the other two sides. What will be the magnetic force per unit length acting on the wire AB if the ammeter reading is 8 A?

The characteristic oxidation state of Lanthanoids is +3, but Ce shows +4 oxidation state because…
(A) It has variable ionization enthalpy
(B) It has a tendency to attain noble gas configuration
(C) It has a tendency to attain \(f^0\) configuration
(D) It resembles \(\mathrm{Pb}^{4+}\)

If both the number of turns and length of an inductor are tripled, keeping other factors constant, the self inductance of the inductor will be:

The wall layer which provides nourishment to the developing pollen grains is called: