Which of the following complex species is not expected to exhibit optical isomerism?

How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?

Energy of an electron is given by E = - 2.178 \times {10^{ - 18}}J\left( {{{{Z^2}} \over {{n^2}}}} \right). Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be (h = 6.62 × 10−34 Js and c = 3.0 × 108 ms−1)

The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be:

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

Which of the following exists as covalent crystals in the solid state?

A solution of (–$$l$$) – chloro –1 – phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :

Compound $$\left(A\right),C_8{H}_{9}Br,$$ gives a white precipitate when warmed with alcoholic $$AgN{O}_3.$$ Oxidation of $$(A)$$ gives an acid $$\left(B\right),$$ $$C_8{H}_6{O}_4.\left(B\right)$$ easily forms anhydride on heating. Identify the compound $$(A).$$

The rate of a reaction doubles when its temperature changes from 300K to 310K. Activation energy of such a reaction will be:(R = 8.314 JK–1 mol–1 and log 2 = 0.301)

The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide sol increases in the order:

Arrange the following compounds in order of decreasing acidity :

An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism:

Consider the following reaction: $$xMn{O}_4^{-}+y{C}_2{O}_4^{2-}$$ + zH+ $$\to$$ xMn2+ + 2yCO2 + {z \over 2}{H_2}O The value's of x, y and z in the reaction are, respectively :

Which of the following is the wrong statement?

The order of stability of the following carbocations :

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0oC. As it does so, it absorbs 208J of heat. The values of q and w for the process will be : (R = 8.314 J/mol K) ( l n 7.5 = 2.01)

A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is

Experimentally it was found that a metal oxide has formula M0.98O. Metal M, present as M2+ and M3+ in its oxide. Fraction of the metal which exists as M3+ would be

The molarity of a solution obtained by mixing 750 mL of 0.5 (M) HCl with 250 mL of 2(M) HCl will be:

A compound with molecular mass 180 is acylated with CH3COCl to get a compound with molecular mass 390. The number of amino groups present per molecule of the former compound is: