In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When CO2 gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated. 'X' and 'Y' respectively are :

In the extraction of copper from its sulphate ore, metal is finally obtained by the oxidation of cuprous sulphide with :

Two 5 molal solutions are prepared by dissolving a non-electrolyte non-volatile solute separately in the solvents X and Y. The molecular weights of the solvents are Mx and My, respectively where Mx = {3 \over 4} My. The relative lowering of vapor pressure of the solution in X is ''m'' times that of the solution in Y. Given that the number of moles of solute is very small in comparison to that of the solvent, the value of ''m'' is :

The mass of a non-volatile, non-electrolyte solute (molar mass = 50 g mol-1 ) needed to be dissolved in 114 g octane to reduce its vapour pressure to 75%, is :

For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point?

In which of the following reactions, an increase in the volume of the container will favour the formation of products?

At a certain temperature in a $$5$$ $$L$$ vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium according to the reaction, CO + Cl2 $$\rightleftharpoons$$ COCl2 At equilibrium, if one mole of CO is present then equilibrium constant (Kc) for the reaction is :

The gas phase reaction 2NO2(g) $$\to$$ N2O4(g) is an exothermic reaction. The decomposition of N2O4, in equilibrium mixture of NO2(g) and N2O4(g), can be increased by :

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [3Ca3 (PO4)2.Ca(OH)2] to

Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?

The increasing order of diazotisation of the following compounds is :

Products A and B formed in the following reactions are respectively :

Which of the following will not exist in zwitter ionic form at pH=7 ?

The increasing order of nitration of the following compounds is :

The increasing order of basicity of the following compounds is :

When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produced is :

When an electric currents passed through acidified water, 112 mL of hydrogen gas at N.T.P. was collected at the cathode in 965 seconds. The current passed, in ampere, is :

How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane? (Atomic weight of B = 10.8 u)

The copolymer formed by addition polymerization of styrene and acrylonitrile in the presence of peroxide is :

Which of the following statements is not true ?