Which one of the following substances has the highest proton affinity?

In curing cement plasters water is sprinkled from time to time. This helps in :

The solubilities of carbonates decrease down the magnesium group due to a decrease in :

The substance not likely to contain CaCO3 is :

The IUPAC name of CH3COCH(CH3)2 is

Among the following four structures $$i$$ to $$iv,$$ it is true that

The general formula CnH2nO2 could be for open chain

In the anion HCOO$$-$$ the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?

The internal energy change when a system goes from state A to B is 40 kJ/mole. If the system goes from A to B by a reversible path and returns to state A by an irreversible path what would be the net change in internal energy?

The enthalpy change for a reaction does not depend upon :

The correct relationship between free energy change in a reaction and the corresponding equilibrium constant Kc is :

If at 298 K the bond energies of C - H, C - C, C = C and H - H bonds are respectively 414, 347, 615 and 435 kJ/mol, the value of enthalpy change for the reaction H2C = CH2(g) + H2(g) $$\to$$ H3C - CH3(g) at 298 K will be :

In an irreversible process taking place at constant T and P and in which only pressure-volume work is being done, the change in Gibbs free energy (dG) and change in entropy (dS), satisfy the criteria :

When CH2 = CH - COOH is reduced with LiAlH4, the compound obtained will be

The reaction of chloroform with alcoholic $$KOH$$ and p-toluidine forms

What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

25 ml of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a litre value of 35 ml. The molarity of barium hydroxide solution was

A pressure cooker reduces cooking time for food because

In a 0.2 molal aqueous solution of a weak acid HX the degree of ionization is 0.3. Taking kf for water as 1.85, the freezing point of the solution will be nearest to

If liquids A and B form an ideal solution