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Which of the following graph is correct for the given two step endothermic reaction?



दी गयी दो पदीय ऊष्माशोषी अभिक्रिया के लिए निम्नलिखित में से कौनसा ग्राफ सही है?

Find the ratio of frequencies of violet light $({\lambda }_1=4.10\times {10}^{-5}cm)$ to that of red light $({\lambda }_2=6.56\times {10}^{-5}cm)$. Also determine the ratio of energies carried by them.

The relative charges on an electron, a proton and a neutron respectively are:

Find the concentration of $H^{+}$ ion that must be maintained in a saturated solution of $H_{2}S\left(0.1M\right)$ so as to precipitate $CdS$ not $ZnS$

Given: $\left[C{d}^{2+}\right]=\left[Z{n}^{2+}\right]=\left(0.1M\right)$ initially.

$K_{sp}\left(CdS\right)=8\times {10}^{-27}{K}_{sp}\left(ZnS\right)=1\times {10}^{-21}{K}_{sp}\left(H_{2}S\right)=1.1\times {10}^{-21}$

For the following gases equilibrium, $N_2{O}_4\left(g\right)\rightleftharpoons 2N{O}_2\left(g\right),K_p$ is found to be equal to $K_c$. This is attained when :

Amorphous solids do not have

A $2.8g$ of mixture of carbonates of two monovalent metals are heated to corresponding oxides and carbondioixde. The metal $A$ is $20\%$ by weight. The mass of carbondioxide obtained from the reaction is $0.88g$. The mass of the metal $B$ in the mixture is

Identify (X):

One mole of Helium gas undergoes a reversible cyclic process ABCDA as shown in the figure.

Assuming gas to the ideal, answer the following questions:



What is the net work involved in the process A to C?

Which is true about following?

The compressibility factor of a gas is less than 1 at STP. Its molar volume $V_m$ will be:

A Grignard reagent is prepared by the action of magnesium in dry ether on

Which of the following defects is generally found in sodium chloride and cesium chloride?

What is the ratio of the volumes occupied by $2$ moles of $O_2$ and $3$ moles of $O_3$ at standard temperature and pressure ?

Which of the following is $\gamma$ position in

$\underset{IV}{C{H}_3}-\underset{III}{C}{H}_2-\underset{II}{C}{H}_2-\underset{I}{\stackrel{Br}{\stackrel{|}{C{H}_2}}}$

The geometries of the ammonia complexes of $N{i}^{2+},P{t}^{2+}andZ{n}^{2+},$ respcetively, are

Percentage composition of hydrogen in benzene ($C_6{H}_6$) is :

Which of the following compound would yield trialkyl borane as shown below when treated with $B{H}_3$ and THF ?

A real gas most closely approaches the behaviour of an ideal gas at

The decreasing order of basic strength in the gas phase$\underset{\left(I\right)}{C_6{H}_{5}N{H}_2},\underset{\left(II\right)}{(C_6{H}_5{)}_{2}NH},\underset{\left(III\right)}{C{H}_{3}N{H}_2,\underset{\left(IV\right)}{N{H}_3}}$ is:

The root word used for 8 carbons in parent chain is

When an aqueous solution of D - glucose or D - mannose is treated with a base it undergoes some conversions. This conversion (isomerisation) involves

Predict the major product in the given reaction?

What is the minimum concentration of $B{a}^{+2}$ ions required in order to initiate the precipitation of $BaS{O}_4$ from a solution containing $0.002mol{L}^{-1}$ of $S{O}_4^{-2}$ ions?

(Given $K_{sp}$ for $BaS{O}_4=1.4\times {10}^{-10}$ )

The threshold frequency ${\nu }_0$ for a metal is $7.0\times {10}^{14}{s}^{-1}$. Calculate the kinetic energy of an electron emitted when radiation of frequency $\nu$ = $1.0\times {10}^{15}{s}^{-1}$

The IUPAC name for the following compound is:

1. $2,5$-dimethyl-$5$-carboxy-hex-$3$-enal

2. $2,5$-dimethyl-$6$-oxo-hex-$3$-enoic acid

3. $6$-formyl-$2$-methyl-hex-$3$-enoic acid

4. $2,5$-dimethyl-$6$-carboxy-hex-$3$-enal

Arrange the following type of solid in the increasing order of melting point

In a $2.4\times {10}^{-3}M$ Hydrogen bromide ($HBr$) solution, find the concentration of $O{H}^{-}$ ?

The root mean square speed of molecules of nitrogen gas is $v$ at a certain temperature. When the temperature is doubled, the molecules dissociate into individual atoms. The new rms speed of the atom is:

Diamond is an example of

For the equilibrium

$LiCl.3N{H}_3\left(s\right)\rightleftharpoons LiCl.N{H}_3\left(s\right)+2N{H}_3\left(g\right);$

$K_p=9at{m}^2$ at ${37}^{\circ }C.$ A $5L$ vessel contains $0.1$ mole of $LiCl.N{H}_3$. How many moles of $N{H}_3$ should be added to the flask at this temperature to derive the backward reaction for completion?

Use : $R=0.082{\text{atm L mol}}^{-1}{\text{K}}^{-1}$

$X+H^{+}⟶Y+N{a}^{+}+H_{2}O$

$Y+KCl⟶K_{2}C{r}_2{O}_7+NaCl$



Find X and Y.

Electronic configuration of $H^{-}$ is

At certain temperature, a compound $A{B}_2$ dissociates as: $2A{B}_{2\left(g\right)}\to 2A{B}_{\left(g\right)}+B_{2\left(g\right)}$ with a degree of dissociation $\alpha$, which is very small compared to unity. The expression of $K_p$ in terms of $\alpha$ and total pressure P is ?

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them

In a mixture of two inert gases, a diatomic gas A has 3 moles and a monoatomic gas B has 6 moles: The mole fraction of A is:

The general solution of $\frac{dy}{dx}=\frac{1-3y-3x}{1+x+y}$ is

(where ${}^{\prime }{c}^{\prime }$ is constant of integration)

Aryl halides do not undergo nucleophilic substitution reactions under ordinary conditions because:

At a particular temperature $H^{+}\left(aq\right)+O{H}^{-}\left(aq\right)\to H_{2}O\left(l\right);\Delta H=-57.1kJ$. The approximate heat evolved when $400mL$ of $0.2$ $H_{2}S{O}_4$ is mixed with $600mL$ of $0.1m$ $KOH$ solution will be:

Which of the following is expected to have high density?

Consider the following reaction sequence:

$S_8\text{(s)}+8O_2\text{(g)}\to 8S{O}_2\text{(g)}$

$2S{O}_2\text{(g)}+O_2\text{(g)}\to 2S{O}_3\text{(g)}$

How many moles of $S{O}_3$ are produced from 10 moles of $S_8$?

An aqueous solution of a non-electrolyte boils at 100.52°C. The freezing point of the solution will be

In the electrochemical cell:

$Zn|ZnS{O}_4\left(0.01M\right)||CuS{O}_4\left(1.0M\right)Cu$, the emf of this Daniell cell is $E_1$. When the concentration of $ZnS{O}_4$ is changed to 1.0 M and that of $CuS{O}_4$ changed to 0.01 M, the emf changes to $E_2$. From the followings, which one is the relationship between $E_1$ and $E_2$? (Given, RT/F = 0.059)

Which of the following statements is(are) correct?

In the iso electronic species the ionic radii ($A^O$) of $N^{3-}$, $O^{-2}$, $F^{-}$ are respectively given by