Class 12th

The given graph is a representation of kinetics of a reaction.

The y and x axes respectively are for zero and first order reactions, respectively are:

A ball is projected with a velocity, $10{\mathrm{m}\mathrm{s}}^{-1}$ , at an angle of ${60}^{?}$  with the vertical direction, its speed at the highest pint of its trajectory will be :

Given below are half cell reactions:
MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O, E°(Mn²⁺/MnO₄⁻) = -1.510 V
½O₂ + 2H⁺ + 2e⁻ → H₂O, E°(O₂/H₂O) = +1.223 V

Will the permanganate ion, MnO₄⁻liberate O₂ from water in the presence of an acid?

A capacitor of capacitance ' $C$ ' is connected across an ac source of voltage $\mathrm{V}$ , given by $\mathrm{V}={\mathrm{V}}_0\mathrm{s}\mathrm{i}\mathrm{n}?\omega \mathrm{t}$ The displacement current between the plates of the capacitor, would then be given by:

The incorrect statement regarding enzymes is:

A convex lens ' $A$ ' of focal length $20\mathrm{c}\mathrm{m}$ and a concave lens ' $\mathrm{B}$ ' of focal length $5\mathrm{c}\mathrm{m}$ are kept along the same axis with a distance ' $d$ ' between them. If a parallel beam of light falling on ' $A$ ' leaves ' $B$ ' as a parallel beam, then the distance ' $\mathrm{d}$ ' in $\mathrm{c}\mathrm{m}$  will be:

A capacitor of capacitance C = 900pf is charged fully by 100 V battery B as shown in figure (a). Then it is disconnected from the battery and connected to another uncharged capacitor of capacitance C = 900pf  as shown in figure (b). The electrostatic energy stored by the system (b) is :

The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be:

The IUPAC name of the complex - [Ag(H₂O)₂[Ag(CN)₂] is: