Which one of the following conformation of cyclohexane is chiral?

In conversion of lime-stone to lime, CaCO3(s) $$\to$$ CaO(s) + CO2 (g) the vales of ∆H° and ∆S° are +179.1 kJ mol−1 and 160.2 J/K respectively at 298 K and 1 bar. Assuming that ∆H° do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is :

Assuming that water vapour is an ideal gas, the internal energy change $$\left(\Delta U\right)$$ when $$1$$ mol of water is vapourised at $$1$$ bar pressure and $$100^{\circ }C$$ (Given : molar enthalpy of vapourisation of water at $$1$$ bar and $$373$$ $$K$$ $$=41kJmo{l}^{-1}$$ and $$R=8.3Jmo{l}^{-1}{K}^{-1}$$ )

Identify the correct statement regarding a spontaneous process :

The compound formed as a result of oxidation of ethyl benzene by KMnO4 is :

In the reaction 2Al(s) + 6HCl(aq) $$\to$$ 2Al3+ (aq) + 6Cl-(aq) + 3H2(g)

The density (in g mL-1) of a 3.60 M sulphuric acid solution that is 29% H2SO4 (molar mass = 98 g mol-1) by mass will be

A 5.25 % solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol−1) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm−3, molar mass of the substance will be

A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be

Which one of the following is the strongest base in aqueous solution?

In the chemical reaction, CH3CH2NH2 + CHCl3 + 3KOH $$\to$$ (A) + (B) + 3H2O, the compound (A) and (B) are respectively

The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 25oC are given below: $${\wedge }_{C{H}_{3}COONa}^o$$ = 91.0 S cm2/equiv $${\wedge }_{HCl}^o$$ = 426.2 S cm2/equiv What additional information/quantity one needs to calculate $${\wedge }^o$$ of an aqueous solution of acetic acid?

The cell, Zn | Zn2+ (1M) || Cu2+ (1M) | Cu($$E_{cell}^o$$ = 1.10V) was allowed to be completely discharged at 298 K. The relative concentration of Zn2+ to Cu2+ \left[ {{{\left[ {Z{n^{2 + }}} \right]} \over {\left[ {C{u^{2 + }}} \right]}}} \right] is

The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :

Identify the incorrect statement among the following :

Which of the following species exhibits the diamagnetic behaviour?

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizinig order of the polarizing power of the cationic species, K+, Ca2+, Mg2+, Be2+?

In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed?

Which of the following hydrogen bonds is the strongest?

The secondary structure of a protein refers to