Arrange the following amines in increasing order of basicity in aqueous solution
(A)\(\left( CH _3\right)_2 NH\)
(B) \(CH _3 NH _2\)
(C)\(\left( CH _3\right)_3 N\)
(D) \(NH _3\)
Choose the correct answer from the options given below :

What is the first step in acid catalyzed dehydration of alcohol?

Reaction of aniline with conc. \(HNO _3\) and conc. \(H _2 SO _4\) at 298 K will produce \(47 \%\) of:

Name the following reaction.
\(ArN_2^{+} X^{-} \xrightarrow{Cu / HBr} ArBr+N_2+CuX \)

Match List - I with List - II.

List - I	List - II
(A) Gel	(I) Hair cream
(B) Foam	(II) Dust
(C) Emulsion	(III) Cheese
(D) Aerosol	(IV) Whipped cream

Choose the correct answer from the options given below :

Four different electrolyte solutions with the concentrations given below have the same molar conductivity value of \(1.29 \times 10^{-4} \mathrm{~S} \mathrm{~m}^2 \mathrm{~mol}^{-1}\). Arrange them in increasing order of their conductivity values:
(A) 0.1 M
(B) 0.075 M
(C) 0.15 M
(D) 0.05 M
Choose the correct answer from the options given below:

"Answer the question on basis of passage given below :
Carboxylic acids are weaker than mineral acids, but they are stronger acids than alcohols and many simple phenols (\(\text{pKa}\) is ~ 16 for ethanol and 10 for phenol). The higher acidity of carboxylic acids as compared to phenols can be understood similarly. The conjugate base of carboxylic acid, a carboxylate ion, is stabilised by two equivalent resonance structures in which the negative charge is at the more electronegative oxygen atom. The conjugate base of phenol, a phenoxide ion, has non-equivalent resonance structures in which the negative charge is at the less electronegative carbon atom. Further, the negative charge is delocalised over two electronegative oxygen atoms in carboxylate ion whereas it is less effectively delocalised over one oxygen atom and less electronegative carbon atoms in phenoxide ion. Thus, the carboxylate ion is more estabilised than phenoxide ion, so carboxylic acids are more acidic than phenols.
Effect of substituents on the acidity of carboxylic acids: substituents may affect the stabliity of the conjugate base and thus, also affect the acidity of the carboxylic acids. Electron withdrawing group increase the acidity of carboxylic acids by stabilising the conjugate base through delocalisation of the negative charge by inductive and/or resonance effects. Conversely, electron donating groups decrease the acidity by destabilising the conjugate base.
Arrange the following acids in order of their increasing \(\text{pKa}\) value:
(A) Benzoic acid
(B) 2-nitrobenzoic acid
(C) 4-nitrobenzoic acid
(D) 4-methoxybenzoic acid
Choose the correct answer from the options given below:"

Which of the following particles/rays is emitted in a radioactive decay in which neither the atomic number nor the mass number changes?

For the linear programming problem (LPP) :
Maximize \(Z=x+1.5 y\), subject to constraints, \(x+2 y \leq 40,2 x+y \leq 40, x+y \leq 25, x \geq 0, y \geq 0\).
Which of the following is NOT correct?

In the depression of freezing point experiment, it is found that,
A. The vapour pressure of the solution is less than that of pure solvent.
B. The vapour pressure of the solution is than that of pure solvent.
C. Only solute molecules solidify at the freezing point.
D. Only solvent molecules ecules solidify at the freezing point.
Choose the correct answer from the options given below :

Arrange the steps for transformation of recombinant DNA in sequence -
(A). For heat shock, bacterial cells are placed at 42°C; and then they are placed on ice.
(B). The bacterial cells must be made 'competent' to take up DNA by treating them with a specific concentration of divalent cation such as calcium.
(C). The bacteria are now able to take up the recombinant DNA.
(D). Recombinant DNA can then be forced into those cells by incubating the cells with recombinant DNA on ice.
Choose the correct answer from the options given below:(C)
(C), (B), (D), (A)

p-block elements are placed in groups 13 to 18 of the periodic table. Group 15 is nitrogen family. Nitrogen makes various compounds like \(NH _3, HNO _3, N_2 O , NO _2\) etc. Phosphorus exists in the form of white and red phosphorus. White phosphorus glows in dark. \(PH _3\) gas is used as smoke screen. Group 16 is called oxygen family. Dry air contains \(21\% O _2\) gas by volume. Combined sulphur exists as sulphates such as gypsum, epsome salt, baryte etc. The allotropic forms of sulphur are Rhombic and monoclinic sulphur. \(S_2\) is paramagnetic like \(O_2\) and it stable at high temperature.
Group 17 is Halogen family. \(F_2\) is highly reactive, \(C l_2\) is greenish yellow gas. Both \(S O_2\) and \(C l_2\) are used for bleaching. Group 18 is Noble gas family but some noble gases also form compounds.
Complete hydrolysis of \(XeF _6\) gives HF and \(XeO _3\) as main products.
Sulphate of magnesium of the following is :

Residual and persistent nucellus present in some seeds is called: