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What is the ratio of rates of effusion of one mole of $O_2$ and one mole of $H_2$, if both are kept at identical pressure and temprature?

The long form of periodic table has

On going down a main sub-group in the periodic table (example Li to Cs in IA or Be to Ra in IIA), the expected trend of changes in atomic radius is a

In the conversion of limestone to lime:

$CaC{O}_3\left(s\right)\to CaO\left(s\right)+C{O}_2\left(g\right)$

The values of $△H^{\circ }$ and $△S^{\circ }$ are 179.1 kJ $mo{l}^{-1}$ and 160.2 J/K respectively at 298 K and 1 bar. Assuming $△H^{\circ }$ and $△S^{\circ }$ remains constant with temperature, at what temperature will the conversion of limestone to lime be spontaneous?

$Othophosphoricacid\underset{{220}^{\circ }C}{\overset{gentleheat}{\to }}X$.

What is(are) correct about X?

A diatomic ideal gas initially at $273K$ is given $100cal$ heat due to which system did $209J$ work. Molar heat capacity $\left(C_m\right)$ of gas for the process is:

If $N_A$ is the Avogadro’s number, then the number of valence electrons in $4.2\text{g}$ of nitride ions $\left(N^{3-}\right)$ is:

2SO₃ (g) ⇌ 2SO₂ (g) + O₂ (g) ΔH°= +198 kJ

At equilibrium temperature, what shifts the equilibrium to right?

Half - life of the reaction :$H_2{O}_{2\left(aq\right)}\to H_2{O}_{\ell }+\frac{1}{2}{O}_{2\left(g\right)}$ is independent of initial concentration of $H_2{O}_2$. Volume of $O_2$ gas after 20 minutes is 5L at 1 atm and ${27}^{\circ }C$, and after completion of the reaction 50 L. The rate constant is :

Consider the composite system, which is held at 300 K, shown in the following figure. Assuming ideal gas behavior, calculate the total pressure if the barriers separating the compartments are removed. Assume that the volume of the barriers is negligible. (Given: R = 0.082 atm L/mol. K)

The pH of 0.1 M solution of the following salts increases in the order

If the solubility product of a sparingly soluble salt $L{i}_{3}P{O}_4$ is $2.7\times {10}^{-9}$. The concentration $\left(mol{L}^{-1}\right)$ of $L{i}^{+}$ ions in the saturated solution of the salt is:

Given : $\left(100\right)$${}^{\frac{1}{4}}=3.16$

Assuming that having a velocity greater than velocity of light is not possible, find out the value of the highest atomic number of hydrogen like ion which can exist.

Given that the velocity of electron in the first orbit of Bohr hydrogen atom is $2.18\times {10}^6{\text{ms}}^{-1}$.

In IUPAC name of the following compound, the prefix bacause of -Br and suffix bacause of C = 0 will be respectively

Match the column (for electrolytic refining of Cu):

$\begin{array}{cccc}& & & \\ & Column-I& & Column-II\\ \left(a\right)& Anode& \left(p\right)& ThinsheetsofpureCu\\ \left(b\right)& Cathode& \left(q\right)& Anaqueoussolutionofcoppersulphatecontaining{H}_{2}S{O}_4\\ \left(c\right)& Electrolyte& \left(r\right)& Ag,Au\\ \left(d\right)& Anodemud& \left(s\right)& ImpuremetalofCu\end{array}$

Select the correct order of magnetic moment (in B.M.) from the following options:

Two solutions of $KN{O}_3$ and $C{H}_{3}COOH$ are prepared separately having the same molar concentration.

The correct relationship between the osmotic pressures is

Final product P is

The product of the reaction given below

Magnetic moment of $C{r}^{+2}(Z=24),M{n}^{+2}$ (Z=25) and $F{e}^{2+}(Z=26)$ are $x,y,z$ They are in order :

At what temperature will the total K.E. of 0.3 mol of $He$ be the same as the total K.E. of 0.40 mol of $Ar$ at $400\text{K}$ ?

Which of the following is the correct order of -I effect?

A is one of the reactants. Which concentration plot is linear for a first-order equation?

Density of water is maximum at:

Calculate resonance energy of $N_{2}O$ from the following data

Hence, $△H^{\circ }\left(N_{2}O\right)=82kJmo{l}^{-1}$

Assume structure $N^{\Theta }=N^{⨁}=O$

BE of $(N\equiv N)bond=950kJmo{l}^{-1}$

$(N=N)bond=420kJ$ mol${}^{-1}$

$O=O)bond=500kJmo{l}^{-1}$

$(O=N)bond=610kJmo{l}^{-1}$

The de Broglie wavelength of a particle with mass $1g$ and velocity $100m{s}^{-1}$ is:

Metallic tin in the presence of $HCl$ is oxidized by $K_{2}C{r}_2{O}_7$ to stannic chloride, $SnC{l}_4$. What volume of deci-normal dichromate solution would be required by $11.9g$ of tin?

(Atomic mass of Sn $=119u$)

$Pb{C}_2{O}_4\underrightarrow{\Delta }A+C{O}_2+CO$

Identify A.

Which of the following equations represent the standard heat of formation of $C_2{H}_4$?

Vant' Hoff equation shows the effect of temperature on equilibrium constants $K_c$ and $K_p.$ The $K_p$ varies with temperature according to the relation:

Which of the following gives the de Broglie’s relationship?

A branched polysaccharide containing α - D - Glucose which are linked by 1 - 4 & 1- 6 glycosydic linkages is

[BHU 1981]

Which of the following is the laboratory preparation of dihydrogen?

The element which exists as a liquid upto ${2000}^{\circ }C\&$ can be used in high temperature thermometry is

$(C{H}_3{)}_{3}CCl\stackrel{NaCN}{\to }A\stackrel{dil.H_{2}S{O}_4}{\to }B$. Compund B is

Which of the following has a permanent dipole moment?

In which of the following cases, the reaction with a given $K_c$ goes farthest towards completion?

Oxidation number of N in $(N{H}_4{)}_{2}S{O}_4$ is

$FeC{r}_2{O}_4+N{a}_{2}C{O}_3+O_2⟶X+Y+C{O}_2$

Mention X and Y.

Which of the following will not be stable?

If ${△}_0<P,$ where $P$ is pairing energy and ${△}_0$ is the crystal field spliting energy, the correct electronic configuration for $d^4$ system will be:

If the ratio of specific heat of a gas at constant pressure to that at constant volume is $\gamma ,$ the change in internal energy of a mass of gas, when the volume changes from $V$ to $2V$ under constant pressure $P$, is