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How many oxygen atoms are present in 2 gram-atoms of $O$?

100 ml mixture of Co and $C{O}_2$ is mixed with 30 ml of oxygen and sparked in a eudiometer tube. The residual gas after treatment with aqueous KOH has a volume of 10 ml which remains unchanged when treated with alkaline pyrogallol. If all the volumes are under the same conditions, point out the correct option(s).

Pressure cooker reduces cooking time for food because:

The reciprocal of compressibility factor of a real gas in the critical state is ?

Which of the following is/are ambident nucleophiles?

A gaseous mixture containing $CO$, $C{H}_4$ and $N_2$ gas has total volume of 40 $mL$. This mixture is exploded with excess of oxygen, on cooling 30 $mL$ of contraction is observed and when this mixture is treated with aqueous $KOH$ a further contraction of 30 $mL$ is observed. Find the composition of the mixture in $mL$.

The fraction of total molecules which is ionised in a solution of an electrolyte is known as

Which of the following pair of metals is purified by van Arkel method?

Which of the following sets has all the species that do not follow octet rule?

The work done by 2 mole of an ideal gas at 300 K in a reversible isothermal expansion from 10 litres to 20 litres is

When strongly heated, Sodium thiosulphate disproportionates into compounds having ___ different oxidation states.

Which will show maximum non-metallic character?

For the reaction, at ${1000}^{o}C$

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

$△G^o=-24kJmo{l}^{-1},p_{C{O}_2}=0.0030atm$

Hence, $△G$ at this temperature is :

Half life of a first-order reaction is $1386seconds$. The specific rate constant of the reaction is :

Propionic acid is subjected to reduction with hydroiodic acid in the presence of a little P, the product formed is

Which of the following orders regarding relative stability of free radicals is correct?

The oxidation numbers of C - 1 and C - 2 in propene $C{H}_3{}^{2}CH={}^{1}C{H}_2$ are respectively

A crystallizes in HCP close packing and B occupied $\frac{1}{2}$ of octahedral voids.

Calculate the formula of the compound?

What if 2 ions of A are removed from the corner of each unit cell?

What is the new crystal formula?

Which of the following compounds will not react with methyl magnesium bromide?

If ${\lambda }_0$ and $\lambda$ be the threshold wavelength and the wavelength of incident light, the velocity of photo-electrons ejected from metal surface is:

Which one of the following can be used as a monomer in a polymerization reaction?

Equal volumes of two gases A and B diffuse through a porous pot in 20s and 10s, respectively .If the molar mass of A be $80gmo{l}^{-1}$,Find the molar mass of B.

If Pt is used as catalyst in the decomposition of $H_2{O}_2$, then it is an example of

What is the general formula for oxide of element $M$ with atomic number 87?

Which of the following is/are TRUE about electromeric effect ?

The vapour density of a mixture containing $N{O}_2$ and $N_2{O}_4$ is $27.6$. Mole fraction of $N{O}_2$ in the mixture is:

A piece of wood was burned and 7.32 g of $C{O}_2$ was collected. The total radioactivity in $C{O}_2$ was 7.6 dpm. How old was the wood sample ? Given $t_{\frac{1}{2}}$ of C - 14 = 5730 years, specific activity of carbon obtained from a fresh wood sample is 15.2 dpm.

What is the minimum possible atomic number of the element containing four electrons in the ground state with magnetic quantum number $m_l$=$+1$ ?

$C\left(s\right)+O_2\left(g\right)\to C{O}_2\left(g\right),{\Delta }_{r}H=-94.3kcal/mol$

$CO\left(g\right)+\frac{1}{2}{O}_2\left(g\right)\to C{O}_2\left(g\right),{\Delta }_{r}H=-67.4kcal/mol$

$O_2\left(g\right)\to 2O\left(g\right),{\Delta }_{r}H=117.4Kcal/mol$

$CO\left(g\right)\to C\left(g\right)+O\left(g\right),{\Delta }_{r}H=230.6Kcal/mol$

Calculate: ${\Delta }_{r}HforC\left(s\right)\to C\left(g\right)inKcal/mol$

Which of the following does not react with sodium bisulphite ?

The volume (in $\text{mL}$) of $0.1\text{M}AgN{O}_3$ required for the complete precipitation of chloride ions present in $30\text{mL}$ of $0.01\text{M}$ solution of $\left[Cr\right(H_{2}O{)}_{5}Cl]C{l}_2$, as silver chloride is close to:

An ideal solution is that which:

The normality of a solution of sulphuric acid is 0.1 N. Its molarity will be:

Oxygen gas weighing $64g$ is expanded from $1atm$ to $0.1atm$ at $30{}^{o}C.$ Calculate entropy change, assuming the gas to be ideal

A black compound ‘A’ in its solid state is fused with $KOH$ and $KCl{O}_3$. The aqueous extract of the fused mass is a green coloured solution ‘B’. On passing $C{O}_2$ gas through it, pink colour of ‘C’ is noticed along with some black insoluble mass of ‘A’. The pink coloured solution is decolourised by $F{e}^{2+}$ in acidic medium. The oxidation state of the central metal in ‘C’ is?

Correct statements regarding 'D' is

The correct order for the acidic character of the following carboxylic acid is ?

Which of the following compound has the highest dipole moment?

In the purification of NaCl, an impure solution is saturated with HCl gas. The principle involved is: