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Calculate the hydrolysis constant of a salt containing $N{O}_2^{-}$ ion. If $K_a$ for $HN{O}_2=4.5\times {10}^{-10}$.

Which of the following dipolar structure of the amino acid is considered to be more correct ?

Equal volumes of 10%$\frac{v}{v}$ of HCl is mixed with 10%$\frac{v}{v}$ NaOH solution. If density pure NaOH is 1.5 times that of pure HCl then the resultant solution be

$Xe{F}_2$ involves hybridisation

What is the relation between $\Delta H$ and $\Delta E$ in this reaction?

$C{H}_{4\left(g\right)}+2O_{2\left(g\right)}\rightleftharpoons C{O}_{2\left(g\right)}+2H_2{O}_{\left(l\right)}$

The species having bond angles of ${120}^{\circ }$ is

Which of the following is the most stable product of the following reaction?

When one mole of an ideal gas is compressed to half of the initial volume and simultaneously heated to twice of its initial temperature, the change in enthalpy $\left(\Delta S\right)$ is (Considering the process to be isobaric)

An element forms two oxides of 2.9 g and 2.25 g of these oxides each was found to contain 1.12 L of $O_2$ at STP. What is the simple ratio if it obeys law of multiple proportions?

Which statement is true regarding the following structure?

Reduction of nitroalkanes in neutral medium ( $Zn/N{H}_{4}Cl$ ) forms mainly

Who developed the long form of periodic table?

The chemical composition of 'slag' formed during the smelting process in the extraction of copper is:

One litre of a gas weights 2g at 300 K and 1 atm. pressure. If the pressure is made 0.75 atm, at which temperature will one litre of the same gas weigh 1g?

For the chemical equilibrium, $CaC{O}_3\left(s\right)\rightleftharpoons CaO\left(s\right)+C{O}_2\left(g\right),△H^o,$ can be determined from which one of the following plots

Correct graphical representation of 1^st ionization energies (Δ_iH) of Li, Be, B, C, N and O is



Li, Be, B, C, N तथा O की प्रथम आयनन ऊर्जाओं (Δ_iH) का सही ग्राफीय निरूपण है

Hydrogen peroxide is reduced by

Which has no
rotation of symmetry

[Orrisa JEE 2004]

Expressed in SI units, when the universal gas constant (R) is divided by Avogadro’s number (N), we get:

A buffer solution of $pH=4$ is to be prepared, using $C{H}_{3}COOH$ and $C{H}_{3}COONa.$ The concentration of acetic acid and sodium acetate are $\frac{1}{10}M$ and $xM$. How much will the $pH$ be if $1.5L$ of $H_{2}O$ is added to above buffer ? $K_a\left(C{H}_{3}COOH\right)=4.7447$

The correct increasing order of stability of the following free radicals is

In the disproportion reaction:

$H_{3}P{O}_2\to P{H}_3+H_{3}P{O}_3$

The equivalent mass of $H_{3}P{O}_2$ is (M = molar mass of $H_{3}P{O}_2$)

Choose the incorrect order of basic strengths of given amines in aqueous phase.

The angular velocity of an electron occupying the second Bohr orbit of $H{e}^{+}$ ion is: (in $s^{-1}$)

In case of autocatalysis:

Kerosene is used as a fuel because

The free rotation about a bond exists when the bond is a

The resonating structures for $N_{2}O$ are given below :



Choose the correct decreasing order of stablity:

Four species are listed below.

$\left(i\right)HC{O}_3^{-}$

$\left(ii\right)H_3{O}^{+}$

$\left(iii\right)HS{O}_4^{-}$

$\left(iv\right)HS{O}_{3}F$

Which one of the following is the correct sequence of their acid strength?

What volume of $0.1MHCOONa$ solution should be added to $50\text{mL}$ of $0.05M$ formic acid to produce a buffer solution of $pH=4.0$, $p{K}_a$ of formic acid $=3.7$ ?

The liquid mixtures which distill with a change in composition are called

The radius of hydrogen atom in ground state is $0.53\stackrel{\circ }{A}$. The radius of the first orbit of$L{i}^{2+}$ will be:

The boiling point of a solution of 0.105 gm of a substance in 15.84 gram of ether was found to be 100°C higher than that of pure ether. What is the molecular weight of the substance [Molecular elevation constant of ether per 100 g = 21.6]

A solution which is ${10}^{-3}M$ each in $M{n}^{2+},F{e}^{2+}$ and $H{g}^{2+}$ is treated with ${10}^{-16}M$ sulphide ion, If $K_{sp}$ of $MnS,FeS,ZnSandHgS$ are ${10}^{-15},{10}^{-25},{10}^{-20}$ and ${10}^{-54}$ respectively, which one will precipitate first?

The mass of Hydrogen at S.T.P. that is present in a vessel which can hold 4 grams of oxygen under similar conditions is

The ratio of wavelengths of photons corresponding to the $\beta$ - line of Lyman series in H - atom and $\alpha$ - line of Balmer series in $L{i}^{2+}$ is:

Arrange the following in the increasing order of boiling point.

Arrange in decreasing order of boiling point.



$Si{H}_4,Ge{H}_4,Sn{H}_4,C{H}_4$

Maximum stability will be in which of the following free radicals?

Conjugate base of $H_{2}P{O}_4^{-}$ is:

Rectified spirit obtained by fermentation contains 4.5% of water. So in order to remove it, rectified spirit is mixed with suitable quantity of benzene and heated. Benzene helps because [KCET 1987]

If one electron has been removed from an atom, it becomes increasingly difficult to remove the second and subsequent electrons from the resulting positively charged ions on account of electrostatic attraction between the nucleus and the remaining electrons. If the ionization values of elements are plotted against the atomic number, then peaks are occupied by:

The chlorobenzene is generally obtained from a corresponding diazonium salt by reacting it with

[MP PMT 2000]

(A) follows first order reaction, (A) $\to$ product.

The concentration of A changes from 0.1 to 0.025 M in 40 min.

Find the rate of reaction of A when the concentration of A is 0.01 M.

An aqueous solution of methanol in water has vapour pressure:

Sodium thiosulphate could be synthesized by

The set(s) representing the correct order of ionic radius is/are: