Which chloride does not exist as hydrate ?

Which of the following causes "blue baby syndrome"?

Arrange the following organic halides in correct order of reactivity towards \(\mathrm{S}_{\mathrm{N}} 2\) displacement.

When \(25 \mathrm{~g}\) of a non-volatile solute is dissolved in \(100 \mathrm{~g}\) of water, the vapour pressure is lowered by \(2.25 \times 10^{-1} \mathrm{~mm}\). If the vapour pressure of water at \(20^{\circ} \mathrm{C}\) is \(17.5 \mathrm{~mm}\), what is the molecular weight of the solute?

The correct statements with respect to dialysis of colloidal solution are
I. Colloidal particles can pass through the membrane.
II. Animal bladder can be used as membrane.
III. Cellophane is not used as membrane.
IV. Ions or small molecules can diffuse through membrane into water.

Which one of the following is used in the preparation of cellulose nitrate?

\(2 \mathrm{Cu}_2 \mathrm{O}(s)+\mathrm{Cu}_2 \mathrm{~S}(s) \longrightarrow 6 \mathrm{Cu}(s)+\mathrm{SO}_2(g)\)
the oxidant and reductant respectively in the above reaction are

The radius of the circle \(r=\sqrt{3} \sin \theta+\cos \theta\) is

A wire of length 0.5 m and area of cross-section \(4 \times 10^{-6} \mathrm{~m}^2\) at a temperature of \(100^{\circ} \mathrm{C}\) is suspended vertically by fixing its upper end to the ceiling. The wire is then cooled to \(0^{\circ} \mathrm{C}\), but is prevented from contracting, by attaching a mass at the lower end. If the mass of the wire is negligible, then the value of the mass attached to the wire is
[Young's modulus of material of the wire \(=10^{11} \mathrm{~N} \mathrm{~m}^{-2}\); coefficient of linear expansion of the material of the wire \(=10^{-5} \mathrm{~K}^{-1}\) and acceleration due to gravity \(\left.=10 \mathrm{~m} \mathrm{~s}^{-2}\right]\)

If an electron in the excited state falls to ground state, a photon of energy 5 eV is emitted, then the wavelength of the photon is nearly

In which one of the following pairs the two species have identical shape, but differ in hybridisation?

When the axes are rotated through an angle \(\theta\) about origin in anticlockwise direction and then translated to the new origin \((2,-2)\), if the transformed equation of the equation of \(\mathrm{x}^2+\mathrm{y}^2=4\) is \(\mathrm{X}^2+\mathrm{Y}^2+\mathrm{aX}+\mathrm{bY}+\mathrm{c}=0\) then \(\mathrm{a}+\mathrm{b}+\mathrm{c}=\)

In the circuit given below, if the bulb is to glow with maximum intensity, the value of ' \(R\) ' is
(neglect internal resistance of the cell)