What is the coordination number of Ni in \([Ni(NH_{3})_{4}]\) complex?

Match solution in List-l with nature of solute and solvent List-ll

List-l (Solution)	List-II (Solute and Solvent)
(A) Amalgam of mercury in sodium	(I) solid in liquid
(B) An alloy	(II) liquid in gas
(C) A saturated solution of KCI	(III) liquid in solid
(D) Chloroform in nitrogen gas	(IV) Copper in gold

Choose the correct answer from the options given below:

Choose the incorrect statement from the following:

Number of unpaired electrons in the square planar [Pt(CN)₄]^2- are :

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 :

Answer the question on the basis of passage given below:
In the periodic table, the d-block contains the elements of group \(3\) to \(12\). The d-orbitals are progressively filled in each of the four long periods. The elements of d block referred as transition metals have partly filled d orbitals and exhibit certain characteristic properties such as variety of oxidation states, formation of coloured ions, act as catalyst and show paramagnetic behaviour.
The two inner transition metals series \(4f\) and \(5f\) are known as Lanthanoids and Actinoids respectively. The lanthanoids resemble one another more closely as compared to ordinary transition elements in any series.
For the four successive transition elements given below, the stability of +2 oxidation state will be:
A. \(\operatorname{Cr}( Z =24)\)
B. \(Mn ( Z =25)\)
C. \(Fe ( Z =26)\)
D. \(Co ( Z =27)\)
Choose the correct answer from the options given below:

Which of the following alkyl halide will undergo \(S_N1\) reaction most readily :

Identify the antibody present in colostrum.

Which of the following two STIs can be transmitted through contaminated surgical equipment and are not completely curable?

In a transformer, the input current and voltage are 3 A and 50 V respectively. The ratio of the number of turns in the primary coil to secondary coil is 5 : 3. The output current and voltage, respectively, are

The value of \(c \in[0, \pi]\) for which the function \(f(x)=e^x \sin x\) satisfies Rolle's theorem is:

A 10 cm long air-core solenoid of cross-sectional area \( 1.0 \, \text{cm}^2 \) contains 300 turns. Its inductance is:

When an \( \alpha \)-particle of mass M moving with velocity v bombards a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on M as