Class 12th

512 identical drops of mercury are charged to a potential of 2V each. The drops are joined to form a single drop. The potential of this drop is ……………. V.

The major product of the following reaction is

A transmitting station releases waves of wavelength 960m. A capacitor of 2.56 $\mu F$ is used in the resonant circuit. The self inductance of coil necessary for resonance is……………. * 10^-8 H.

The major components of German Silver are

In the given circuit of potentiometer, the potential difference E across AB (10m length) is larger than E₁ and E₂ as well. For key K₁ (closed), the jokey is adjusted to touch the wire at point J₁ so that there is no deflection in the galvanometer. Now the first battery (E₁) is replaced by second battery (E₂) for working by making K₁ open and K₂ closed. The galvanometer gives then null deflection at J₂. The value of   $\frac{E_1}{E_2}is\frac{a}{b},$ where a = …………….

Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test in performed with aniline?

A proton, a deuteron and an α  particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic force acting on them is ----------- and their speed is ----------- in the ratio.

What is 'X' in the given reaction?

In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment?

(i) ${\left[Fe{F}_6\right]}^{3-},$ (ii) ${\left[Co{\left(N{H}_3\right)}_6\right]}^{3+},$ (iii) ${\left[NiC{l}_4\right]}^{2-}$ , (iv) ${\left[Cu{\left(N{H}_3\right)}_4\right]}^{2+}$