For the given uniform square lamina $$ABCD$$, whose center is $$O,$$

Equal masses of methane and oxygen are mixed in an empty container at 25oC. The fraction of the total pressure exerted by oxygen is

Which of the following reactions will yield 2, 2-dibromopropane?

The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly

Which one of the following has a square planar geometry?

The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is :

In a sautrated solution of the sparingly soluble strong electrolyte AgIO3 (Molecular mass = 283) the equilibrium which sets in is AgIO3(s) $$\leftrightharpoons$$ Ag+(aq) + $$I{O}_3^{-}$$ If the solubility product constant Ksp of AgIO3 at a given temperature is 1.0 $$\times$$10−8, what is the mass of AgIO3 contained in 100 ml of its saturated solution?

The first and second dissociation constants of an acid H2A are 1.0 $$\times$$ 10−5 and 5.0 $$\times$$ 10−10 respectively. The overall dissociation constant of the acid will be :

Which of the following sets of quantum numbers represents the highest energy of an atom?

Which of the following is the correct order of decreasing SN2 reactivity?

The energies of activation for forward and reverse reactions for A2 + B2 $$\leftrightharpoons$$ 2AB are 180 kJ mol−1 and 200 kJ mol−1 respectively. The presence of catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol−1. The enthalpy change of the reaction ( A2 + B2 $$\to$$ 2AB) in the presence of catalyst will be (in kJ mol−1)

Consider the reaction, 2A + B $$\to$$ products. When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is

A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room?

Which of the following nuclear reactions will generate an isotope?

In the following sequence of reactions, CH3CH2OH \buildrel {P + {I_2}} \over \longrightarrow A $$\underset{ether}{\overset{Mg}{⟶}}$$ B \buildrel {HCHO} \over \longrightarrow C \buildrel {{H_2}O} \over \longrightarrow D the compound ‘D’ is

Regular use of which of the following fertilizer increases the acidity of soil?

Identify the incorrect statement among the following :

The stability of dihalides of $$Si,Ge,Sn$$ and $$Pb$$ increases steadily in the sequence :

Which of the following molecules is expected to rotate the plane of plane - polarized light?

Presence of a nitro group in a benzene ring