Q. The edge length of the unit cell of a body-centered cubic (bcc) crystal is $352pm$. Calculate the radius of the atom.

Q. What is a buffer solution? How is it prepared? Explain the buffer action of a basic buffer with a suitable example.

Q. Calculate the number of coulombs required to deposit $5.4g$ of $Al$ when the electrode reaction is:
${Al}^{3+}+3e^{-}\to Al$ [Atomic weight of $Al=27$ $g/mol$]

Q. The molecular weight of an organic compound is $58g{mol}^{-1}$. What will be the boiling point of a solution containing $48$ gram of the solute in $1200$ gram of water ?
[$K_b$ for water $=0.513kg{mole}^{-1}$; Boiling point of water $=100$.]

Q. Benzaldehyde undergoes ___________ reaction due to __________ of $\alpha$-hydrogen atom.

1. Cannizzaro' presence
2. Cannizzaro; absence
3. Henry's; presence
4. Henry's; absence

Q. The solubility product of $Pb{Cl}_2$ at $298K$ is $1.7\times {10}^{-5}$. Calculate the solubility of $Pb{Cl}_2$ in $g/lit$ at $298K$.
Atomic weights : [$Pb=207$ and $Cl=35.5$]

Q. When $S{O}_2$ is passed through acidified $K_2{Cr}_2{O}_7$ solution, the colour of the solution changes to :

1. Red
2. Green
3. Black
4. Orange

Q. When the concentration of a reactant of first order reaction is doubled, the rate becomes ________ times, but for ___________ order reaction, the rate remains same.

1. Two; zero
2. Four; zero
3. Zero; four
4. Zero; three

Q. In a body centred and face centred arrangement of atoms of an element, what will be the number of atoms present in respective unit cells? Justify your answer with calculation.

Q. Explain the following :
(i) When $NaCl$ is added to $AgN{O}_3$ solution, a white precipitate is formed.
(ii) An aqueous solution of ammonium chloride is acidic in nature.

Q. Wohler's synthesis is used for the preparation of :

1. Amino acids
2. Glycine
3. Urea
4. Proteins

Q. What is the pH value of a solution whose hydroxyl ion concentration is $1\times {10}^{-2}M$?

Q. Match the following :

Q. The unit of conductance is _________ and that of specific conductance is __________.

1. ${ohm}^{-1}{cm}^2$; ${ohm}^{-1}{cm}^{-1}$
2. ${ohm}^{-1}$; ${ohm}^{-1}{cm}^2$
3. ${ohm}^{-1}{cm}^{-1}$; ${ohm}^{-1}{cm}^2$
4. ${ohm}^{-1}$; ${ohm}^{-1}{cm}^{-1}$

Q. What is the order of reaction whose rate constant has the same unit as the rate of reaction?

Q. In the equation ${CH}_{3}COOH+{Cl}_2\underset{-HCl}{\overset{RedP}{\to }}A$, the compound $A$ is :

1. $C{H}_{3}C{H}_{2}Cl$
2. $C{H}_{3}COCl$
3. $ClC{H}_{2}COOH$
4. $C{H}_{3}Cl$

Q. Electrochemical equivalent is the amount of substance which gets deposited from its solution on passing electrical charge equal to :

1. $96,500$ coulomb
2. $1$ coulomb
3. $60$ coulomb
4. $965$ coulomb

Q. Water acts as Bronsted acid as well as a Bronsted base. Give one example each to illustrate this statement.

Q. Determine the pH value of $0.001M$ acetic acid solution if it is $2$% ionised at this concentration. How can the degree of dissociation of this acetic acid solution be increased?

Q. What will be the value of van't Hoff factor $\left(i\right)$ of benzoic acid if it demerises in aqueous solution? How will the experimental molecular weight vary as compared to the normal molecular weight?

Q. A compound $AB$ has simple cubic structure and has molecular mass $99$. Its density is $3.4g{cm}^{-3}$. What will be the edge length of the unit cell?

Q. For the reaction : $2N{O}_{\left(g\right)}\rightleftharpoons N_{2\left(g\right)}+O_{2\left(g\right)}$; $\Delta H=-$heat
$K_e=2.5\times {10}^2$ at $298K$
What will happen to the concentration of $N_2$ if :
(1) Temperature is decreased to $273K$.
(2) Pressure is reduced.

Q. A $10$% aqueous solution of cane sugar (mol. wt. $342$) is isotonic with $1.754$% aqueous solution of urea. Find the molecular mass of urea.

Q. Write the reaction to prepare acetaldehyde from hydrogen gas and an acid chloride?

Q. Consider the following cell reaction at $298K$ :
$2{Ag}^{+}+Cd\to 2Ag+{Cd}^{2+}$
The standard reduction potentials $\left(E^o\right)$ for ${Ag}^{+}/Ag$ and ${Cd}^{2+}/Cd$ are $0.80V$ and $-0.40V$ respectively :
(1) Write the cell representation.
(2) What will be the emf of the cell if the concentration of ${Cd}^{2+}$ is $0.1M$ and that of ${Ag}^{+}$ is $0.2M$?
(3) Will the cell work spontaneously for the condition given in (2) above?

Q. The solubility of silver chloride ___________ in the presence of sodium chloride because of __________.

1. increases; common ion effect
2. increases; aldol condensation
3. decreases; common ion effect
4. decreases; aldol condensation

Q. Ideal solutions obey __________ law and they _________ form azeotropic mixtures.

1. Raoult's; do not
2. Henry's; do not
3. Raoult's; do
4. Ion effect; do not

Q. The complex ion ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$ is :

1. Tetrahedral and diamagnetic
2. Tetrahedral and paramagnetic
3. Square planar and paramagnetic
4. Square planar and diamagnetic

Q. In a first order reaction, $10$% of the reactant is consumed in $25$ minutes. Calculate :
(1) The half-life period of the reaction.
(2) The time required for completing $87.5$% of the reaction.