Raoult's Law

Q. H3PO4 IS A TRIBASIC ACID AND ONE OF ITS SALT IS NaH2PO4.WHAT VOLUME OF 1M NaOH SHOULD BE ADDED TO 12g NAH2PO4 TO CONVERT IT INTO NA3PO4? 1)100mL 2)200ml 3)80mL 4)300m

Q.

The freezing point of benzene decreases by $0.{45}^{°}\mathrm{C}$when $0.2\mathrm{g}$acetic acid is added to$20\mathrm{g}$ of benzene. If acetic acid associates to form a dimer in benzene, the percentage association of acetic acid in benzene will be : $(\mathrm{Kf}\mathrm{for}\mathrm{benzene}=5.12\mathrm{K}\mathrm{kg}{\mathrm{mol}}^{-1})$

1. $74.6\%$

2. $94.6\%$

3. $64.6\%$

4. $80.4\%$

Q. Find the number of moles of H2O2 required to completely react with 400ml of 0.5N KMnO4 in acidic medium

Q. the concentration of NH_4+ IONS in an aqueous solution which is 0.02M NH3 & 0.01M KOH would be: kb=1.8×10^{-5

Q. Match the following gas laws with the equation representing them.

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \text{(A)}& \text{Boyle’s law}& \text{i)}& \text{V}\propto n\text{at constant}T\text{and}p\\ \text{(B)}& \text{Charle’s law}& \text{ii)}& p_{total}=p_1+p_2+p_3+\dots \text{at constant}T,V\\ \text{(C)}& \text{Dalton’s law}& \text{iii)}& \frac{pV}{T}=constant\\ \text{(D)}& \text{Avogadro law}& \text{iv)}& V\propto T\text{at constant}n\text{and}p\\ & & \text{v)}& p\propto \frac{1}{V}\text{at constant}n\text{and}T\end{array}$

Q. HCl gas is passed into water, yielding a solution of density 1.095 g mL^-1 and containing 30% HCl by weight. Calculate the molarity of the solution

Q. what is the equivalent weight of H3PO4 when it reacts with NaOH?

Q. while calculating molality from mole fraction why we neglect the moles of solute in denominator

Q. according to sidewick concept of maximum covalency find maximum covalency of F O N?

Q.

Pure Benzene has a vapour pressure of $70\mathrm{torr}$, while methylbenzene has a vapour pressure of $20\mathrm{torr}$. Find the mole fraction of Benzene in the vapour phase if the two components are mixed in an equimolar ratio.

Q. Which of the following statement is correct for a solution containing binary mixture of volatile liquids?

1. Both (a) and (c)
2. Partial pressure of each component of an ideal mixture of liquids is independent of mole fraction of the component in​ the solution
3. In equilibrium, the vapour consist of only one component which has more vapour pressure
4. Partial pressure of each component of an ideal mixture of liquids is dependent of mole fraction of the component in​ the solution

Q. 1litre of 0.5N HCl solution is heated and reduced to 750ml. In the process 2.92 gm HCl is lost. Find normality of the solution formed

Q. Which of the following figures does not represent $1mole$ of oxygen gas at $STP$?

1. $11.2litres$ of gas
2. $6.022\times {10}^{23}$ dioxygen molecules
3. $22.4litres$ of gas
4. $16grams$ of gas

Q.

Which solution will show the maximum vapour pressure at 300 K?

1. 1M C₁₂H₂₂O₁₁

2. 1M CH₃COOH

3. 1M KCl

4. 1M NaCl

Q.

When a substance is dissolved in a solvent the vapour pressure of the solvent is decreased. This results in:

1. An increase in the boiling point of the solution
2. A decrease in the boiling point of the solvent
3. The solution having a higher freezing point than the solvent
4. The solution having a lower osmotic pressure than the solvent

Q. 43.Which one of the following is not a buffer solution? (1) 0.8M H2S0.8M KHS (2) 2M C&H, NH2 + 2M C6H5NH3+Br (3) 3M H2CO3+ 3M KHCO3 (4) 0.05M KCIO4 + 0.05M HCIO4

Q. Out of the following liquid pairs, the solution which shows a positive deviation from Raoult’s law is:

1. Acetone + Chloroform
2. Water + Nitric acid
3. Water + Hydrochloric acid
4. Benzene + Methanol

Q. 67. Calculate the molarity of 30 ml of 0. 5M H2So4 diluted to 500 ml.

Q.

The equilibrium pressure of the system $N{H}_{4}H{S}_{\left(s\right)}$$\leftrightharpoons$$N{H}_3$(g) + $H_{2}S$(g) is 8 atmosphere at a certain temerature at a certian temperature.The equilibrium constant $K_p$s

1. 16.0

2. 8.0

3. 32.0

4. 4.0

Q. Mixture of volatile components A and B has total vapour pressure (in torr):
p = 254 – 135 $x_A,$ where $x_A$ is the mole fraction of A in mixture hence $p_A^o$ and $p_B^o$ are (in torr)

1. 254, 119
2. 119, 254
3. 135, 254
4. 154, 119

Q. The value of equilibrium cons†an t for reaction is 16, HgO(s) = Hg(g) + 1/2O2(g) . The partial pressure of oxygen gas will be

Q. 1gram of a carbonate (M2CO3) on treatment with excess HCl produces 0.01186 mole of CO2, the molar mass of M2CO3 in g mol-1 is

Q.

The latent heat of vapourisation of water is 9700 cal/mole. If the boiling point is 100°C, the ebullioscopic constant of water is

1. 0.513°C

2. 1.026°C

3. 10.26°C

4. 1.832°C

Q. Why is Z of ions in Bcc 1 in case of density calculation

Q. Calculate mass% of NaOH in NaOH aqueous solution if mole fraction of NaOH is 0.1

Q. Q28) How much water should be added to 200 с.c. of semi normal solution of NaOH to make it exactly deci normal? [ AFMC 1983] а) 200 с.с. b) 400 cc. c) 800 с.с. d) 600 с.с.

Q. Which forms a buffer solution? (1) 20 ml 1M CH3COOH + 60 ml 1M NaOH (2) 40 ml 1M NaCN + 20 ml 1M HCl (3) CH3COONH4 (4) HCl + NH4Cl

Q. Prove that HCN and HNC are Tautomers to eachother.

Q. 39. A non found gas of 83%C and 17%H according to weight.same temperature & pressure it effused multiply of0.87 from CO2 find the molecular formulaof non found gas 1)C2H5 2)C3H3 3)C4H10 4)C7H10

Q. How to check that the given equation is Disproportionation or not?