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The freezing point of benzene decreases by ${0.45}^{\circ }C$ when 0.2 $g$ of acetic acid is added to 20 $g$ of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be:
$(K_{f}forbenzene=5.12Kkgmo{l}^{-1})$

Find the frequency range of visible light, given that it encompasses wavelengths from 380 nm to 760 nm.

Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law, with $t_{\frac{1}{2}}=3.00h$. What fraction of sample of sucrose remains after 8h?

The correct order of melting point of group 14 elements is :

What is correct structure of (R,E)-5-methylhept-2-en-4-one?

Attacking or electrophilic species in nitration of benzene is :

When an ideal gas is compressed adiabatically and reversibly, the final temperature is:

1. 0.89

Which one of the following is an incorrect orbital notation?

A thermal power plant operates on a regenerative cycle withh a single open feedwater heater, as shown in the figure. For the state points shown, the specific enthalpies are: $h_1=2800kJ/kg$ and $h_2=200kJ/kg$. The bleed to the feedwater heater is $20$% of the boiler steam generation rate. The specific enthalpy at state $3$ is

In which of the following compounds (*) marked atom is the most basic atom in that compound ?

Concentrated aqueous sulpheric acid is 98% $H_{2}S{O}_4$ by mass and has a density of $1.80{\text{g mL}}^{-1}$. Volume of acid required to make one litre of $0.1\text{M}{H}_{2}S{O}_4$ solution is:

The number of valence electrons in the elements $A$ and $B$ are $4$ and $6$ respectively. What is the most probable compound formed from $A$ and $B$?

Which of the following gas is liberated when $NaN{O}_3$ salt is heated

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

If A and B are two different chemical species undergoing 1st order decomposition with rate constant Ka and Know which are in the ratio 3:2 in magnitude. If the initial concentration of A and B are in the ratio 3:2 .What would be the concentration of A and B after three half lives of A

Consider te following molecules:

Choose the correct comparison of stability:

Match the type of acid/base with the corresponding example.

The correct stability order of the following three quinones is ?

In the structure of a compound, oxide ions are cubic close packed whereas $\frac{1}{8}th$ of tetrahedral voids are occupied by $A^{2+}$ cation and half of octahedral voids are occupied by $B^{3+}$ cations. The general formula of the compound having structure is:

Which of the following is a decomposition reaction ?

The reagent which does not react with both, Acetone and benzaldehyde is

Which of the following is a pair of isodiaphers?

On evaporation of, $330.0\text{g}$ of an aqueous solution of solute (molar mass $=36{\text{g mol}}^{-1}$) reduces to $140.0\text{g}$ and simultaneously $20.0\text{g}$ of solute crystallizes out. The mole fraction of the solute in the solution is $0.1$. The molarity of the saturated solution left over is:

90 min = of an hour(fraction).

Which of the following is expected to have high density?