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For a Carnot engine, ratio of work done and heat taken from source is $\frac{1}{4}$. If sink temperature is decreased by ${52}^{\circ }\text{C}$ then the ratio becomes $\frac{1}{2}$. Find the temperature of source.

Use the following data to calculate the lattice energy of cesium oxide.

Enthalpy of formation of cesium oxide = $-233kJ/mol$

Enthalpy of sublimation of $Cs=+78kJ/mol$

First ionization energy of $Cs=+375kJ/mol$

Enthalpy of dissociation of $O_2\left(g\right)=494kJ/mol$ of $O_2$ molecules

First electron affinity of $O=-141kJ/mol$ of O atoms

Second electron affinity of $O=+845kJ/mol$ of $O^{-}$ ions

A compound M decomposes by two different reactions under different conditions as follows:
$2M\to 3B+C$ $\text{(yield = 80\%) (i)}$
$3M\to D+2C\text{(ii)}$
The total consumed moles of M are 10 and the moles of B and D formed are 6 mol and 1 mol respectively. The $\%$ yield of the (ii) reaction is:

If the energy of the electron in hydrogen atom in a certain excited state is $-3.4eV$, then what will be its angular momentum?

Calculate the frequency of the spectral line corresponding to the transition of an electron from $n_1=2$ and $n_2=4$ in a hydrogen atom.

When 0 - hydroxybenzaldehyde is heated with ethanoic an hydride in presence sodium ethanoate, compound formed during the reaction is ?

The number of photons of wavelength 400 nm emitted from 10W electric bulb for 10 sec is

Which of the following on reaction with excess of $NaHS{O}_3$ in aqueous solution will give mixture of salts which can be separated in two fraction by fractional crystallization ?

67.2 L of $O_2$ gas is collected at STP. If 4 mol of $KCl{O}_3$ is used in the following reactions:

$KCl{O}_3\left(s\right)⟶KCl\left(s\right)+O_2\left(g\right)$

$KCl{O}_3⟶KCl{O}_4+KCl$

The number of moles of $KCl{O}_4$ formed would be:

At 3000 K the equilibrium pressures of $C{O}_2,$ CO and $O_2$ are 0.6, 0.4 and 0.2 atmospheres respectively. $K_p$ for the reaction, $2C{O}_2\rightleftharpoons 2CO+O_2$ is

Which of the following mixture present in water acts as a good buffer?

In the replacement reaction,



The reaction will be most favourable if $M$ happens to be:

For a liquid, enthalpy of fusion is $1.435kcalmo{l}^{-1}$ and molar entropy change is $5.26calmo{l}^{-1}{K}^{-1}$ The melting point of the liquid is:

When an electromagnetic radiation of wavelength $310nm$ falls on the surface of sodium metal, electrons are emitted with $K.E_{max}=1.5eV$. Determine the work function $W_o$ of metal.

Identify the correct order of wavelength of light absorbed for the following complec ions

$\left[Co\right(H_{2}O{)}_6{]}^{3+};Co(CN{)}_6{]}^{3-};[Co{I}_6{]}^{3-};\left[Co\right(en{)}_3{]}^{3+}IIIIIIIV$

Which of the following includes all the aims of kinetics to?

Which of the following forms a chloride with the least ionic character?

How does the graph (concentration vs time) of a zero order reaction look like?

Which of the following is the correct adsorpation isobar for physisorption?

Here, $\left(\frac{x}{m}\right)$ is extent of adsorption per unit mass of adsorbent.

When one mole of a monoatomic ideal gas at T K undergoes adiabatic change under constant external pressure of 1atm changes from 1L to 2L volume. The final temperature of the gas in Kelvin is