Reduction of nitrobensene by which of the following reagent gives aniline?
(A) \(Sn / HCl\)
(B) \(Fe / HCl\)
(C) \(H _2- Pd\)
(D) \(Sn / NH _4 OH\)
Choose the correct answer from the options given below:

How many C \(\text{mol}^{-1}\) are required to convert 1 mol of \(\text{MnO}_4^-\) to \(\text{Mn}^{2+}\)?
[1F = 96500 C]

According to the Raoult's law, vapour pressure of a solution is directly proportional to:

Which of the following compounds will show highest acidic strength?

Read the passage carefully and answer the questions
The transition metals and their compounds are known for their catalytic activity. This activity is ascribed to their ability to adopt multiple oxidation states and to form complexes. Vanadium(V) oxide (in Contact Process), finely divided iron, and nickel (in Catalytic Hydrogenation) are some of the examples. Catalysts at a solid surface involve the formation of bonds between reactant molecules and atoms of the surface of the catalyst (first row transition metals utilise 3d and 4s electrons for bonding). This has the effect of increasing the concentration of the reactants at the catalyst surface and also weakening of the bonds in the reacting molecules (the activation energy is lowering). Also because the transition metal ions can change their oxidation states, they become more effective as catalysts.
\(TiCl_4 + Al(CH_3)_3\) is used as a catalyst in:

Answer the question on basis of passage given below :
Adsorption is surface phenomenon and it differs from absorption which occurs throughout the body of the substance which absorbs. In physisorption the attractive forces are mainly van der Waal forces while in chemisorption actual bonding occurs between the particles of adsorbent and adsorbed more easily on the surface of a solid as compared to the gases which are liquified with difficulty. Adsorption increases with the increases in pressure and decreases as temperature is increased.
Freundlich adsorption isotherm gives a straight line on plotting.

To avoid the medical condition called 'bends' in scuba divers, the composition of gas filled in the tank is

Match List I with List II

List - I (Codes)	List - II (Codes for)
(A) UUU	(I) Phenyalanine
(B) AUG	(II) Initiator codon
(C) UAA	(III) Terminator codon
(D) GUU	(IV) Valine

Choose the correct answer from the options given below:

Werner was the first to describe the bonding features in coordination compounds. But his theory could not answer basic questions like :
(i) Why only certain elements possess the remarkable property of forming coordination compounds ?
(ii) Why the bonds in coordination compounds have directional properties ?
(iii) Why coordination compounds have characteristics magnetic and optical properties ?
Many approaches have been put forth to explain the nature of bonding in coordination compounds viz. Valence Bond Theory (VBT), Crystal Field Theory (CFT), Ligand Field Theory (LFT) and Molecular Orbital Theory (MOT).
We shall focus our attention on elementary treatment of the application of VBT and CFT to coordination compounds.
According to this theory, the metal atom or ion under the influence of ligands can use its ( \(n -1\) )d, ns np or ns, np, nd orbitals for hybridisation to yield a set of equivalent orbitals of definite geometry such as octahedral, tetrahedral, square planar and so on.
These hybridised orbitals are allowed to overlap with ligand orbitals that can donate electron pairs for bonding.
The formula which correctly represents Potassium tetra hydroxo zincate (II) is :

Match List - I with List - II

List - I	List - II
(A) If vectors \(\vec{a}\) and \(\vec{b}\) are such that \(\vec{a}\) = \(\lambda \vec{b}\) and \(|\vec{a}|=|\vec{b}|\), then	(I) \(\vec{a}\) and \(\vec{b}\) are orthogonal
(B) Projection vector of \(\vec{a}\) on \(\vec{b}\)	(II) [0, 12]
(C) If \(\vec{a}\) and \(\vec{b}\) are non-zero vectors such that \(|\vec{a}+\vec{b}|=|\vec{a}-\vec{b}|\), then	(III) \(\vec{a}= \pm \vec{b}\)
(D) If \(|\vec{a}|=4\) and \(-3 \leq \lambda \leq 2\), then the range of \(|\lambda \vec{a}|\)	(IV) \(\left(\frac{\vec{a} \cdot \vec{b}}{|\vec{b}|^2}\right) \vec{b}\)

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Carbon, silicon and germanium have four valence electrons each. Their valence and conduction bands are separated by energy gap \( E_g \). If we represent \( (E_g)_C, (E_g)_{Si} \) and \( (E_g)_{Ge} \) as their respective energy gaps, then which of the following is true

Three cells with internal resistance are connected as shown in the figure. The equivalent emf of the combination of three cells is:

The following statements are given related to Wheatstone Bridge:
1. when Wheatstone Bridge is balanced, no current flows through the galvanometer arm.
2. Wheatstone Bridge works on the principle of Kirchhoff's law.
3. Being a null method based experiment, the result is free from the effect of extra resistances (cell resistance) of the circuit
4. Wheatstone Bridge is most sensitive when all the four resistances are nearly of the same magnitude.
Choose the correct answer from the options given below: