In corrosion :
(A) A metal is oxidised by loss of electrons to oxygen
(B) It is an Electrochemical phenomenon
(C) The object under corrosion behaves as anode
(D) Coating the metal with Zn can save iron object from corrosion
Choose the correct answer from the options given below :

The compound used as a primary standard in volumetric analysis is :

In inorganic salt analysis, for the indicatory test of \(Cl^-\), conc. \(H_2SO_4\) is used. This is because:

With reference to Arrhenius equation \(k=A e^{-E_a / R T}\)

The higher stability of metal carbonyls is very evident on the basis of spectrochemical series. Identify the incorrect statement(s) about metal carbonyls.
A. The metal-carbon bond has both \(\sigma\) and \(\pi\) characters.
B. Metal-carbon \(\sigma\) bond is formed by donation of lone pair of electrons on carbonyl carbon into vacant \(d\)-orbital of metal.
C. Metal-ligand bond has synergic effect.
D. Transition metals never have zero oxidation state in carbonyls.
E. Metal-carbon \(\pi\) bond is formed by donation of electrons from antibonding molecular orbital of CO to metal.
Choose the correct answer from the options given below :

When benzene diazonium chloride reacts with phenol, it results in the formation of an orange colored compound (X); and when benzene diazonium chloride reacts with aniline, it results in the formation of a yellow colored compound ( Y ).
What are \(X\) and \(Y\) ?

The pair in which both the species have the same magnetic moment (spin only value) is :

Which of the following base is NOT present in DNA?

Hugo de Vries's work on mechanism of evolution states that evolution is

A tightly wound 100 turn coil of radius 5 cm is carrying a certain amount of current. The magnitude of the magnetic field at the center of the coil is \( 2\pi \times 10^{-4} \, T \). The value of current flowing through the coil is

Match List-l with List-ll

List - I (Reactions)	List - II (Products)
(A) CH3CH2Br + alc.KOH	(I) CH3CH2NO2
(B) CH3CH2Br + aq.KOH	(II) CH2 = CH2
(C) CH3CH2Br + KNO2	(III) CH3CH2ONO
(D) CH3CH2Br + AgNO2	(IV) CH3CH2OH

Choose the correct answer from the options given below:

In the electrophilic substitution reactions of aniline, the \(- NH _2\) group acts

A molecule of a substance has a permanent electric dipole moment of magnitude \(10^{-31} C m\).
One mole of this substance is \(100 \%\) polarised by applying a strong electrostatic field of magnitude \(10^8 V m ^{-1}\).
The direction of the field is suddenly changed by an angle of \(60^{\circ}\).
Find the heat released by the substance in aligning its dipoles along the new direction of the field.
(Take 1 mole \(=6 \times 10^{23}\) molecules)