List of top Chemistry Questions

The vapour pressures of pure benzene and toluene are 160 and 60 torr respectively. The mole fraction of toluene in vapour phase in contact with equimolar solution of benzene and toluene is
The variance of 20 observations is 5. If each observation is multiplied by 2, then the new variance of the resulting observation is
The volume of 0.1 M $H_2SO_4$ required to neutralise completely 40 mL of 0.2 M NaOH solution is
To a 4 litre of 0.2 M solution of NaOH, 2 litre of 0.5 M NaOH are added. The molarity of resulting solution is
To neutralize completely 20 mL of 0.1M aqueous solution of phosphorus acid $(H_3PO_3)$ the volumeof 0.1 M aqueous KOH solution required is
Vapour pressure of pure water at $298 \,K$ is $23.8 \,mm\, Hg$. $50 \,g$ of urea is dissolved in $850\, g$ of water. The vapour pressure of water for this solution and its relative lowering are respectively.
Volume of 0.1 M HCl required to react completely with 1 g equimolar mixture of $Na_2CO_3$ and $NaHCO_3$ is
What are the conditions for an ideal solution which obeys Raoult?? law over the entire range of concentration?
What is the effect of the addition of sugar on the boiling and freezing points of water ?
What is the freezing point of a solution containing 8.1 g HBr in 100 g water, assuming that the acid to be 90% ionized? $(K_f (H_2O) = 1.86 \,K \,kg\, mol^{-1})$
What is the mass percentage of carbon tetrachloride if $22\, g$ of benzene is dissolved in $122 \,g$ of carbon tetrachloride?
What is the mole fraction of glucose in $10\%\, w/W$ glucose solution?
What weight of glycerol should be added to $600\, g$ of water in order to lower its freezing point by $10 \,^?C$ ? $(K_f = 1.86^?\, C\, m^{-1})$
When a gas is bubbled through water at $298 \,K$, a very dilute solution of gas is obtained. Henry?? law constant for the gas is $100\, kbar$. If gas exerts a pressure of $1\, bar$, the number of moles of gas dissolved in $1$ litre of water is
When acetone and chloroform are mixed together, which of the following observations is correct ?
Which of the following aqueous solutions will have highest freezing point ?
Which will form maximum boiling azeotrope ?
Which one of the following solutions exhibits the maximum elevation in boiling point ?
Which one of the following is a colligative property ?
Which of the following will have the highest boiling point at 1 atm pressure ?
Which of the following has the highest freezing point?
An azeotropic solution of two liquids has boiling point lower than either of them when it
The volume of water to be added to $100\, cm^{3}$ of $0.5 \,N\, H_{2}SO_{4}$ to get decinormal concentration is
The rate law for the reaction $2X + Y \rightarrow Z$ is Rate $= A[X][Y1$. The correct statement with regard to this relation is
The inversion of cane sugar is first order in [sugar] and proceeds with half-life of 600 minutes at pH = 4 for a given concentration of sugar. However, if pH = 5, the half-life changes to 60 minutes. The rate law expression for the sugar inversion can be written as