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In cold countries ethylene glycol is added to water in the radiators to[CPMT 1971; NCERT 1971; MP PMT 1993]

Calculate the entropy change accompanying the following change of state.

$H_{2}O(s,-{10}^{\circ }C,1atm)\to H_{2}O(l,{10}^{\circ }C,1atm)$

$C_P$ for ice = $9calde{g}^{-1}mo{l}^{-1}$

$C_P$ for $H_{2}O$ = $18calde{g}^{-1}mo{l}^{-1}$

Latent heat of fusion of ice = $1440calmo{l}^{-1}$ at $0^{\circ }C$

In which alkyl halide, SN² mechanism is favoured maximum

[RPMT 1997]

The unit of $K_p$ for the following reaction at equilibrium will be :

$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right)$

When $K_{2}C{r}_2{O}_7$ is converted to $K_{2}Cr{O}_4$ the change in the oxidation state of chromium is

According to the kinetic theory of gases, in an ideal gas between two successive collisions, a gas molecule travels.....

The correct orer of increasing ionistion energy for the given species is:

When the pressure of 2 litres of $O_2$ gas is doubled and its temperature is also doubled from 300K to 600K, the final volume of the gas is

Which of the following does not react with nitrous acid?

The weight of $181.60\text{mL}$ of a diatomic gas at $0{}^{\circ }\text{C}$ and $1\text{bar}$ pressure is $1\text{g}$. The mass of one molecule (in $\text{g}$) of the gas is:

$(N_A$ is the Avogadro's constant)

Which of the following is the correct expression of $\Delta S$ for an isobaric process?

Treatment of compound O with $KMn{O}_4/H^{+}$ gave P, which on heating with ammonia gave Q. The compound Q on treatment with $B{r}_2/NaOH$ produced R. On strong heating, Q gave S, which on further treatment with ethyl 2-bromopropanoate in the presence of $KOH$ followed by acidification, gave a compound T.



The compound R is:

Which of the following is an functional isomer of butanal?

Which of the following cannot be hydrolysed?

On the addition of a small amount of an acid or a base, the pH value of a buffer solution:

In most cases, for a rise of 10K temperature, the rate constant is doubled or tripled. This is due to the reason that ?

The number of molecules in 89.6 L of a gas at STP are:

The number of moles of $H_2$ present in $0.112\text{L}$ of $H_2$ gas at STP is:

Which of the following has a trigonal planar shape?

What is the wavelength of x-ray, if the interplanar distance of the crystal is 286 pm and the incident angle is ${15.8}^o$. Order of reflection is 2.

Fructose on reduction gives a mixture of two alcohols which are related as ?

The set with the correct order of acidic strength is:

Find out the product 'P' :

$2C_2{H}_6+3O_2\underset{△}{\overset{(C{H}_{3}COO{)}_{2}Mn}{\to }}P+2H_{2}O$

The mass percentage of phosphorus in $H_{3}P{O}_4$ is:

For reaction $A\to B$, rate constant of reaction at ${27}^{\circ }C$ is $1.2\times {10}^{-3}$ $M{s}^{-1}$. The only correct graph for the reaction is,

The measurement of the position of the electron is associated with an uncertainty in momentum, which is equal to $2.5\times {10}^{-8}{\text{g cm s}}^{-1}$. The uncertainty in the velocity of the electron is:



(Mass of an electron is $9\times {10}^{-28}\text{g})$

In the network shown in the figure each of resistance is equal to $2\Omega$. The resistance between A and B is

Pauling's electronegativity values for elements are useful in predicting?

If methane and helium are allowed to diffuse out of a container under identical conditions of temperature and pressure, the ratio of rate of diffusion of methane to helium is:

What is $K_c$ for the following equilibrium when the equilibrium concentration of each substance is: $\left[S{O}_2\right]=0.60M,\left[O_2\right]=0.82M$ and $\left[S{O}_3\right]=1.90M$ ?

$2S{O}_2+O_2\rightleftharpoons 2S{O}_3$

Among the following compounds, which has the maximum lattice energy?

Arrange the following compounds in the decreasing order of reactivity with $HBr$:

Which one of the following aqueous solutions will exhibit highest boiling point?

Arrange the orbitals in the increasing order of their energy $3p_x,2s,4d_{xy},3s,4p_z,3p_y,4s$

The correct order of increasing basicity is

$C{H}_3\underset{I}{C{H}_2}N{H}_{2}C{H}_3\stackrel{\stackrel{NH}{||}}{\underset{II}{C}}C{H}_3\stackrel{\stackrel{O}{||}}{\underset{III}{C}}N{H}_2$

Which of the following is not a correct set of quantum numbers for an electron in an atom?

Which method of purification is represented by the following equations?

$Ni+4CO$ $\stackrel{{70}^{\circ }C}{\to }$ $Ni(CO{)}_4$ $\stackrel{{180}^{\circ }C}{\to }$ $Ni+4CO$

In tetracarbonylnickel, the oxidation state of the central metal atom is:

Equation of curve passing through (3, 9) which satisfies the differential equation $\frac{dy}{dx}=x+\frac{1}{x^2}$, is

Calculate the n-factor for $N{H}_{4}OH$

In the following reaction, $A$ is :

All common amino acids except one react with cold nitrous acid(HNO₂) and evolve nitrogen gas.

That amino acid is

Oxygen is not evolved when:

Given that $2C{l}^{-}\to C{l}_2+2e^{-},E^{\circ }=-1.36V;$

$H_{2}O\to 2H^{+}+\frac{1}{2}{O}_2+2e^{-},E^{\circ }=-1.23V.$ On electrolysing 1M NaCl solution with inert electrodes, which of the following is correct regarding liberation of electrolytic products ?

The solution of $\frac{dv}{dt}+\frac{k}{m}v=-g$ is

Which of the following amines cannot be prepared by Gabriel Synthesis?

Which of the following denotes 5p?