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How is the following resin intermediate prepared and which polymers is formed by this monomer unit?

Consider a tube that has a frilled disk sealed in its centre so that gases can effuse through it in both directions. If the left hand side contains $H_2$ at a pressure $P$ and temperature $T$ and the right hand side contains $He$ at a pressure $2P$ and temperature $T$, then initial ratio of effusion is:

The pyknometric density of sodium chloride crystal is $2.165\times {10}^3{\text{kg m}}^{-3}$ while its X-ray density is $2.178\times {10}^3{\text{kg m}}^{-3}$. The fraction of unoccupied sites in sodium chloride crystal is:

The bond angle in diamond is:

Borax reacts with conc. $HCl$ to give:

If the velocity of hydrogen molecule is $5\times {10}^{4}cmse{c}^{-1}$, then its de-Broglie wavelength is

How many isomeric hexenes, on hydrogenation gives hexane?

The enthalpy of neutralization of $HCl$ and $NaOH$ is $-57kJmo{l}^{-1}$. The heat evolved at constant pressure (in kJ) when $0.5mole$ of H2SO4 react with $0.75mole$ of $NaOH$ is equal to

A molecule possessing dipole moment is:

The resistance of a $\frac{N}{10}KCl$ aqueous solution is $245\Omega$. If the electrodes in the cell are $4cm$ apart and area having $77c{m}^2$ each, the molar conductance of the solution will be:

The equilibrium constant for the reaction is $H_2+B{r}_2\to 2HBr$ at 1024 k is $1.60\times {10}^5.$ Find the equilibrium pressure of all gases if $10bar$ of HBr is introduced into a sealed container at $1024K$.

Which is the mostly commonly used reducing agent among the following?

What is principal quantum number ?

What is the outer electronic configuration of group 13 elements?

Compound (X) $C_4{H}_{8}O,$ which reacts with 2, 4-DNP derivative and gives negative haloform test. The compound is:

Mark the neutral oxide among the following.

The French physicist Louis de Broglie in 1924 postulated that matter, like radiation, should exhibit a dual behaviour. He proposed the following relationship between the wavelength lambda of a material particle, its linear momentum p and planck constant h.
$\lambda =\frac{h}{p}=\frac{h}{mv}$
The de Broglie relation implies that the wavelength of a particle should decrease as its velocity increases. It also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de Broglie waves. These waves differ from the electromagnetic waves as they
$\left(i\right)$ have lower velocities
$\left(ii\right)$ have no electrical and magnetic fields and
$\left(iii\right)$ are not emitted by the particle under consideration.
The experimental confirmation of the de Broglie’s relation was obtained when Davisson and Germer, in 1927, observed that a beam of electrons is diffracted by a nickel crystal. As diffraction is a characteristic property of waves, hence the beam of electron behaves as a wave, as proposed by de Broglie.

If a proton, electron and alpha -particle are moving with the same kinetic energy then the order of their de-Broglie’s wavelength is?

One litre of 11.2 volume H₂O₂ is produced from dil H₂SO₄ during electrolysis. Then the number of electrons passed through dil H₂SO₄ during electrolysis is

Consider two well-formed formulas in propositional logic :



$F_1:P\Rightarrow \rightharpoondown P$



$F_2:(P\Rightarrow \rightharpoondown P)\vee (\rightharpoondown P\Rightarrow P)$



Which of the following statements is correct ?

Which one of the following is the strongest base in aqueous solution?

Four different water samples A, B, C and D each contains150 ppm of ${CaCl}_2$, ${MgSO}_4$,${CaSO}_4$, and ${MgCl}_2$ respectively.Choose the correct order of degree of hardness of these samples.