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Among group 14 elements, the one having the lowest melting point is:

Which of the following ion has smallest ionic radius?

In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are true, reason is correct explanation of assertion.
(b) Assertion and reason both are true but reason is not the correct explanation of assertion.
(c) Assertion is true, reason is false.
(d) Assertion is false, reason is true.

Assertion (A) $\left[Fe\right(CN{)}_6{]}^{3-}$ ion shows magnetic moment corresponding to two unpaired electrons.
Reason (R) Because it has $d^{2}s{p}^3$ type hybridisation.

The intermediate compound 'X' in the following chemical reaction is:

Benzyl bromide, on treatment with a nucleophile - triphenylphosphine, is then made to react with b-Butyl lithium - a strong base to give a yhosphorus ylid.
Which of the following would yield the hydrocarbon:

The following is a reaction of glucose with Fehling's reagent. What will happen in the reaction?

Calculate the resonance energy of $N_{2}O$ from the following data:

${△}_f{H}^{o}of{N}_{2}O=82kJmo{l}^{-1},$

$N\equiv N,946kJmo{l}^{-1};N=N,418kJmo{l}^{-1};$

$O=O,498kJmo{l}^{-1};N=O,607kJmo{l}^{-1}$

Which of the following statements is/are true for Mohr’s salt?

What is the work function of the metal if a light of wavelength $4000\stackrel{\circ }{A}$ generates photoelectrons of velocity $6\times {10}^5{\text{ms}}^{-1}$ from it?
(Mass of electron = $9\times {10}^{-31}\text{kg}$, Velocity of light = $3\times {10}^8{\text{ms}}^{-1}$, Plank's constant = $6.626\times {10}^{-34}\text{Js}$, Charge of electron = $1.6\times {10}^{-19}{\text{J eV}}^{-1}$)

The vapour pressure of a dilute aqueous solution of glucose is $750\text{mm of mercury}$ at $373K$. The mole fraction of solute in the solution is:

Solubility of alkaline earth metal sulphates in water decreases in the sequence:

The efficiency of a carnot cycle on a monoatomic gas is $50$ %. The lowest temperature during the cycle is ${27}^{\circ }C$. If there are $3moles$ of gas, what is the change in its internal energy during adiabatic expansion of the cycle?
$[R=8.3J/mol-K]$.

Which of the following oxides is not expected to react with sodium hydroxide?

What is VSEPR THEORY used for??

The frequency of the electromagnetic wave, which is best suited to observe a particle of radius $3\times {10}^{-4}cm$ is the order of

An aromic compound A of the molecular formula $C_8{H}_{10}O$ on reaction with iodine and dilute $NaOH$ gives a yellow precipitate. The structure of the compound is exprected to be:

Which one of the following represent the bond-line structure of isoheptane?

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is

To prepare $3-\text{ethylpentan}-3-\text{ol}$, the reactants needed are-

Electrolytic refining is used to purify which of the following metals?

What are the harmfull affects of shortage of rainfall?

The alkene which on ozonolysis yields acetone is

The freezing point $\left(in{}^{\circ }C\right)$ of solution containing 0.1 g of $K_3\left[Fe\right(CN){]}_6$ (mol.wt.392) in 100 g of water($K_f$=1.86K kg $mo{l}^{-1}$) is

The momentum of a photon of an electromagnetic radiation is $3.3\times {10}^{-29}kgm{s}^{-1}$. What is the frequency of the associated wave?

The correct stability order of the following resonance structures is:

Calculate $q$ (heat transfered) for an isothermal reversible expansion of $1mole$ of an ideal gas from an initial pressure of $1.0bar$ to a final pressure of $0.1bar$ at a constant temperature of $273K$.

Which compound on reductive ozonolysis gives propanone and isobutyraldehyde?

Consider the reaction

$\stackrel{hv}{\to }B\underset{M{e}_{2}S,C{H}_{2}C{l}_2}{\overset{O_3}{\to }}C\underset{Dil}{\overset{NaoH}{\to }}D$
The final product D is -

If the value of Avogadro number is $6.022\times {10}^{23}mo{l}^{-1}$ and the value of Boltzmann constant is $1.380\times {10}^{-23}J{K}^{-1}$, then the number of significant digits in the calculated value of the universal gas constant is ___