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In which of the following pairs of molecules/ions, both the species are not likely to exist?

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The molarity of a solution obtained by mixing 750 mL of 0.5 (M) HCl with 250 mL of 2(M)HCl will be:

Match the catalysts to the correct processes : $Catalyst(A) TiCl_{3}(B) PdCl_{2}(C) CuCl_{2}(D) V_{2}O_{5} Process(i)Wacker process(ii)Ziegler - Natta polymerization(iii)Contact process(iv)Deacon’s process $

Let O be the vertex and Q be any point on the parabola,$x_{2}=8y$. It the point P divides the line segment OQ internally in the ratio 1 : 3, then the locus of P is :

At present, a firm is manufacturing 2000 items. It is estimated that the rate of change of production P w.r.t. additional number of workers x is given by \displaystyle\frac{{{d}{P}}}{{{\left.{d}{x}\right.}}}={100}-{12}\sqrt{{{x}{\dot}}}If the firm employs 25 more workers, then the new level of production of items is

A hoop of radius r and mass m rotating with an angular velocity $ω_{0}$ is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

Which one has the highest boiling point ?

The locus of the foot of perpendicular drawn from the centre of the ellipse $x_{2}+3y_{2}=6$on any tangent to it is

When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is $2.5×10_{−4}ms_{−1}$. If the electron density in the wire is $8×10_{28}m_{−3}$, the resistivity of the material is close to :