Select the correct name for the following reaction:

\(2 A+B \rightarrow A_2 B\)
For the above reaction, the rate law equation is, rate \(=k[A][ B ]^2\) with \(k=2.0 \times 10^{-6} mol^{-2} L^2 s^{-1}\). If the initial concentrations of \(A\) and \(B\) were \(0.1 mol L ^{-1}\) and \(0.2 mol L ^{-1}\), respectively, the rate of reaction after \([A]\) is reduced to 0.06 \(mol L ^{-1}\) will be

In the reaction \(\left( CH _3\right)_3 C - O - CH _3+ HI \rightarrow\) Products, \(CH _3 OH\) and \(\left( CH _3\right)_3 CCl\) are the products and not \(CH _3 I\) and \(\left( CH _3\right)_3 COH\). It is because:
(A) In step 2 of the reaction, the departure of leaving group ( \(HO - CH _3\) ) creates less stable carbocation.
(B) In step 2 of the reaction, the departure of leaving group ( \(HO - CH _3\) ) creates more stable carbocation.
(C) The reaction follows an SN1 mechanism.
(D) The reaction follows SN2 mechanism.
Choose the correct answer from the options given below :

In which case there is a change in oxidation number?

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

Match List I with List II

LIST - I	LIST - II
A. \(\text{} C_6H_5CHO\)	I. Precipitation with 2,4 DNP
B. \(CH_3C \equiv CH\)	II. Precipitation with AgNO3 (ammoniacal)
C. \(HCN\)	III. Nucleophile
D. \((\wedge-1)\)	IV. Cyanohydrin formation

Choose the correct answer from the options given below :

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:

The value of the determinant \(D=\) equation \(\left|\begin{array}{lll}x & a & a+x \\ y & b & b+y \\ z & c & c+z\end{array}\right|\) is:

The refractive index of the material of an equilateral prism is \(\sqrt{2}\). The angle of minimum deviation of that prism is :

Match List I with List II.

LIST I	LIST II
A. Artificial insemination	I. Infertility
B. Chromosomal disorder	II. Assisted Reproductive Technologies
C. Gonorrhoea	III. Amniocentesis
D. Inability to produce children	IV. Sexually transmitted infections

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Two identical circular loops P and Q each of radius R and carrying current I are kept in perpendicular planes such that they have a common centre as shown in figure. The magnitude of the net magnetic field at the common centre is :

At the time of sunset the sun appears to be at an altitude higher than its actual position. This is because of

Read the passage carefully and answer the questions
Nearly all the transition elements display typical metallic properties such as high tensile strength, ductility, malleability, high thermal and electrical conductivity and metallic lustre. The transition metals (with the exception of Zn, Cd and Hg) are very hard and have low volatility. Their melting and boiling points are high. They have high enthalpies of atomization. lons of the same charge in a given series show progressive decrease in radius with increasing atomic number. However, the variation within a series is quite small. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction which essentially compensates for the expected increase in atomic size with increasing atomic number. The net result of the lanthanoid contraction is that the second and the third d series exhibit similar radii (e.g., Zr 160 pm, Hf 159 pm) and have very similar physical and chemical properties. There is an increase in ionisation enthalpy along each series of the transition elements from left to right. The first ionisation enthalpy, in general, increases, but the magnitude of the increase in the second and third ionisation enthalpies for the successive elements, is much higher along a series. One of the notable features of a transition elements is the great variety of oxidation states these may show in their compounds.
Metallic radii of some transition elements are as follows:
Fe: 126 pm; Co: 125 pm; Ni: 125 pm; Cu: 128 pm
Which of these elements will have highest density?