In a compound atoms of element Y from ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be :

The organic chloro compound, which shows complete stereochemical inversion during a SN2 reaction, is

For a reaction {1 \over 2}A \to 2B rate of disappearance of ‘A’ is related to the rate of appearance of ‘B’ by the expression

Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is

Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives

Which one of the following is the correct statement?

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is :

The absolute configuration of

The electrophile, $$E^{\oplus }$$ attacks the benzene ring to generate the intermediate $$\sigma -$$complex. Of the following, which $$\sigma -$$complex is lowest energy?

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below: {1 \over 2}C{l_2}(g) \buildrel {{1 \over 2}{\Delta _{diss}}{H^\Theta }} \over \longrightarrow $$Cl(g)$$ \buildrel {{\Delta _{eg}}{H^\Theta }} \over \longrightarrow $$C{l}^{-}(g)$$ \buildrel {{\Delta _{Hyd}}{H^\Theta }} \over \longrightarrow $$C{l}^{-}(aq)$$ (Using the data, $${\Delta }_{diss}{H}_{C{l}_2}^{\Theta }$$ = 240 kJ/mol, $${\Delta }_{eg}{H}_{Cl}^{\Theta }$$ = -349 kJ/mol, $${\Delta }_{hyd}{H}_{C{l}^{-}}^{\Theta }$$ = - 381 kJ/mol) will be :

Standard entropy of X2, Y2 and XY3 are 60, 40 and 50 JK−1 mol−1 , respectively. For the reaction, {1 \over 2} X_2 + {3 \over 2} Y_2 \to XY3, $$\Delta H$$ = -30 kJ, to be at equilibrium, the temperature will be :

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

At 80oC, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80oC and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

The vapour pressure of water at 20oC is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20oC, the vapour pressure of the resulting solution will be

The equilibrium constants KP1 and KP2 for the reactions X $$\leftrightharpoons$$ 2Y and Z $$\leftrightharpoons$$ P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressure at these equilibria is :

For the following three reactions a, b and c, equilibrium constants are given: a. CO (g) + H2O (g) $$\leftrightharpoons$$ CO2(g) + H2 (g) ; K1 b. CH4 (g) + H2O (g) $$\leftrightharpoons$$ CO(g) + 3H2 (g) ; K2 c. CH4 (g) + 2H2O (g) $$\leftrightharpoons$$ CO2(g) + 4H2 (g) ; K3

Identify the wrong statements in the following :

Given $$E_{C{r}^{3+}/Cr}^o$$ = -0.72 V; $$E_{F{e}^{2+}/Fe}^o$$ = -0.42V, The potential for the cell Cr | Cr3+ (0.1M) || Fe2+ (0.01 M) | Fe is

Bakelite is obtained from phenol by reacting with