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In the reaction, $I_2+2S_2{O}_3^{2-}\to 2I^{-}+S_4{O}_6^{2-}$

equivalent weight of iodine is

Hyperconjugation occurs in which of the following?

If $p{K}_b$ for the fluoride ion at ${25}^{\circ }C$ is 10.83, the ionization constant of hydrofluoric acid in water at this temperature is

Given : $antilog(-10.83)=1.479\times {10}^{-11}$

Volume occupied by 1 gram of oxygen at STP is

How many geometrical isomers are possible for the following compound?

Calculate the amount of crystalline oxalic acid (equivalent weight = $63\text{g/eq.}$) required to prepare 250 mL of a $\frac{N}{10}$ oxalic acid solution.

Anisole is treated with HI under two different conditions.

$C+D\stackrel{HI\left(g\right)}{\leftarrow }{C}_6{H}_{5}OC{H}_3\stackrel{conc.HI}{\to }A+B$ The nature of A to D will be

As per IUPAC rules, which of the following groups will be regarded as the principal functional group when present with others?

Preparation of glycine by Strecker synthesis involves as one of the starting compounds ?

Calculate the molality of a 1.5 M aqueous salt solution in a solvent X, if the mole fraction of the salt in the solution is 0.25.

(Molar mass of solvent = 40 g/mol)

Which of the following are properties of Crystalline solids?

Acylation process is preferred than direct alkylation because (by the Friedel-Craft's reaction)

The bond dissociation energy of H - H, C - C, and C - H bonds respectively are 104.2, 83.1 and 98.8 kcal/ mole. The electronegativity of C is?

The chain isomer of butane is:

The mass of 70% $H_{2}S{O}_4$ required for the neutralization of $1$ mol of $NaOH$ is:

A hydrocarbon (X) having formula $C_5{H}_{10}$ reacts with HI to give (Y) which on reacting with alcoholic KOH forms (Z). The hydrocarbon is

Which of the following colligative properties can provide molar mass of proteins (or polymers or colloids) with greater precision

A white coloured inorganic salt gives the following reactions.

(i) It is soluble in water and the solution has sweet taste.

The solution turns black in presence of $H_{2}S$

ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water.

iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

Which of the following does not give oxygen on heating?

(IIT-JEE, 2013)

Which of the following is more basic?

Which of the following is/are correct representation(s) for 2,3-dimethylpentane?

Which of the following groups is/are always taken as a substituent in IUPAC nomenclature of organic compounds?

The $O-N-O$ bond angle is maximum in:

The species having pyramidal shape is

Correct orders of first I.P. are -

(i) Li < B < Be < C

(ii) O < N < F

(iii) Be < N < Ne

Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statements is not true.

What will be the heat of formation of methane, if the heat of combustion of carbon is '-x' KJ, heat of formation of water is '-y' KJ and heat of combustion of methane '-Z' KJ?

For the reaction,

$Fe{S}_2+KMn{O}_4+H^{+}\to F{e}^{3+}+H_{2}S{O}_4+M{n}^{2+}+H_{2}O$.

If the molar mass of $Fe{S}_2$ is M, then equivalent mass of $Fe{S}_2$ would be equal to:

An alloy of iron (54.7%), nickel (45%) and manganese (0.3%) has a density of $8.17{\text{g/cm}}^3$. How many iron atoms are present in a block of the alloy measuring $10\text{cm}\times 20\text{cm}\times 15\text{cm}$?

The rate constant of the reaction $A\to B$ is $0.6\times {10}^{-3}$ mole per second. If the concentration of B after 20 min is:

In which of the gases given below, the average speed of the molecule is the least at 1000K?

The e.m.f. of the cell at ${25}^{\circ }C$

$\frac{Cu}{C{u}^{2+}\left(0.01M\right)}||\frac{A{g}^{+}\left(0.1M\right)}{Ag}$

is $[E^0\left(\frac{C{u}^{2+}}{Cu}\right)=0.34Vand{E}^0\left(\frac{Ag+}{Ag}\right)=0.80V]$

The highest melting point among alkali metal is:

If $\frac{e}{m_e}$ = 1.758820 $\times$ ${10}^{11}$ C ${kg}^{-1}$

The mass of an electron is

A solution of $Ni(N{O}_3{)}_2$ is electrolyzed between platinum electrodes using $0.1Faraday$ electricity. Moles of $Ni$ that will be deposited at the cathode:

Which of the following compounds does not evolve a colored gas on decomposition?

The atomic radius in case of inert gasses is?

Which of the following does not have any coordinate bond?

The reagent(s) that can selectively precipitate $S^{2-}$ from a mixture of $S^{2–}$ and $S{O}_4^{2-}$ in aqueous solution is/are:

When $0.15mol$ of Ammonia​ is dissolved in water to make $1L$ of solution, the $[OH{]}^{-}$ of solution is $1.34\times {10}^{-3}M$. Calculate $K_b$​ for $N{H}_3$​.

A molecule possessing dipole moment is:

Which of the following alkynes is most acidic?

Distribution of molecules with velocity is represented by the curve as shown.The velocity at point A is:

For the reactions,

$B{r}_2+O{H}^{-}\to B{r}^{-}+Br{O}_3^{-}+H_{2}O$

what is the equivalent weight of $B{r}_2$ ?

Find the final product (C) in the following reaction sequence.

If the radius ratio is between 0.225 - 0.414, what will be the type of void present. What will be the coordination number?

Enthalpy change for the process,

$H_{2}O\left(s\right)\rightleftharpoons H_{2}O\left(l\right)$

is $6.01kJmo{l}^{-1}.$ The entropy change for 1 mole of ice at its melting point will be

Acidity of pentoxides in VA group