Q. (i) Which one of the following is a polysaccharide: Starch, maltose, fructose, glucose,
(ii) Write one difference between $\alpha -$ helix and $\beta -$ pleated sheet structures of protein.
(iii) Write the name of the disease caused by the deficiency of vitamin $B_{12}$.

Q. Out of $BaC{l}_2$ and $KCl$, which one is more effective in causing coagulation of a negatively charged colloidal sol? Give reason.

Q. Write the formula of any two oxides of sulphur.

Q. Which would undergo $S_{N}1$ reactions faster in the following pair?

Q. (i) What type of isomerism is shown by the complex $\left[Cr\right(H_{2}O{)}_6]C{l}_3$?
(ii) On the basis of crystal field theory, write the electronic configuration for $4d$ ion if ${\Delta }_0>P$.
(iii) Write the hybridization and shape of $[Co{F}_6{]}^{3-}$(Atomic number of Co=27).

Q. What is the formula of compound in which the element $Y$ forms $ccp$ lattice and atoms of $X$ occupy $2/3^{rd}$ of tetrahedral voids?

Q. (i) Name the method of refining to obtain silicon of high purity.
(ii) What is the role of $Si{O}_2$ in the extraction of copper?
(iii) What is the role of depressants in froth floatation process?

Q. Conductivity of $2.5\times {10}^{-4}$ M methanoic acid is $5.25\times {10}^{-5}Sc{m}^{-1}$. Calculate it molar conductivity and degree of dissociation.
(Given: ${\lambda }^0\left(H^{+}\right)=349.5sc{m}^{2}mo{l}^{-1}and{\lambda }^0\left(HCO{O}^{.}\right)=50.5Sc{m}^{2}mo{l}^{-1}$)

Q. Calculate the time to deposit 1.27 g of copper at cathode when a current of 2A was passed through the solution of $CuS{O}_4$.

Q. Name the chemical reagents required in the following reactions:
(i)$C{H}_2=CH-C{H}_{2}OH\to C{H}_2=CH-CHO$
(ii)$C{H}_3-COOH\to C{H}_{3}CON{H}_2$

Q. Write the name and structures of the monomers of the following polymers.

Q. (i) On mixing liquid X and liquid Y, volume of the resulting solution decreases. What type of deviation from Raoult's law is shown by the resulting solution? What change in temperature would you observe after mixing liquids X and Y ?
(ii) What happens when we place the blood cell in water (hypotonic solution)? Give reason.

Q. (a) Account for the following:
(i) $C{u}^{+}$ is unstable in an aqueous solution.
(ii) Transition metals form complex compounds.
(b) Complete the following equations:
$C{r}_2{O}_7^{2-}+8H^{+}+3N{O}_{\overline{2}}\to$

Q. Write one similarity and one difference between the chemistry of lanthanoids and that of actinoids.

Q. Write the IUPAC name of the given compound.
$C{H}_3-CH-C{H}_2-O-C{H}_2-C{H}_3$
|
$C{H}_3$

Q. An aromatic compound 'A' of molecules formula $C_7{H}_6{O}_2$ undergoes a series of reaction as shown below. Write the structures of A, B, C, D and E in the following reactions:
OR
(a) Write the structures of main products when benzene diazonium chloride reacts with the following regents:
(i) $H_{3}P{O}_2+H_{2}O$
(ii)$CuCN/KCN$
(iii)$H_{2}O$
(b) Arrange the following in the increasing order of their basic character in an aqueous solutions:
$C_2{H}_{5}N{H}_2,(C_2{H}_5{)}_{2}NH,(C_2{H}_5{)}_{3}N$
(c) Give a simple chemical test to distinguish between the following pair of compounds:
$C_2{H}_5-N{H}_{2}and{C}_6{H}_5-NH-C{H}_3$

Q. How can the following conversion be carried out:
(i) Aniline to bromobenzene
(ii) Chlorobenzene to 2-chloroaccetophenone
(iii) Chloroethane to butane

Q. Examine the given defective crystal.

Q. (a)Account for the following:
(i)Acidic character increase from $HF$ to $HI$.
(ii)There is a large difference between the melting and boiling points of oxygen and sulphur.
(iii) Nitrogen does not form pentahalide.
(b) Draw the structures of the following:
(i) $Cl{F}_3$
(ii) $Xe{F}_4$

Q. Write one similarity between physisorption and chemisorption.

Q. A delta is formed at the meeting point of sea water and river water. Why?

Q. (i) Write down the IUPAC name of the following complex:
${\left[Co\right(N{H}_3{)}_{5}Cl]}^{2+}$
(ii) Write the formula for the following complex:
Potassium tetrachloridonickelate (II).

Q. Give reasons of the following.
(i) Phenol is more acidic than methanol.
(ii) The C-O-H bond angle in alcohols is slightly less than the tetrahedral angle $\left({109}^{\circ }{28}^{{}^{\prime }}\right)$.
(iii) $(C{H}_3{)}_{3}C-O-C{H}_3$ on reaction with HI gives $(C{H}_3{)}_{3}C-IandC{H}_3-OH$ as the main products and not $(C{H}_3{)}_{3}C-OHandC{H}_3-I$.

Q. Which would undergo $S{N}^2$ reaction faster in the above pair and Why?

Q. What is the formula of a compound in which the element $Y$ forms ccp lattice and atoms of $X$ occupy $1/3^{rd}$ of tetrahedral voids?

Q. A solution is prepared by dissolving 10 g of non-volatile solute in 200 g of water. It has a vapour pressure of 31.84 mm Hg at 308 K. Calculate the molar mass of the solute.
(Vapour pressure of pure water at 308 K = 32 mm Hg).

Q. Seeing the growing cases of diabetes and depression among young children, Mr. Chopra the principle of one reputed school organised a seminar in which he invited parents and principle. They all resolved this issue by strictly banning junk food in schools and introducing healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour of daily physical activities for the students in the morning assembly. After six months, Mr. Chopra conducted the health survey in most of the schools and discovered a tremendous improvement in the health of the students.

Q. For the hydrolysis of methyl acetate in aqueous solution the above tabulated results were obtained:
(a) Show that it follow pseudo first order reaction, as the concentration of water remains constant.
(b) Calculate the average rate of reaction between the time interval 10 to 20 seconds.
(Given : log 2=0.3010, log 4=0.6021)

Q. Predict the products of the following reactions.
(i) $C{H}_3-C=O\stackrel{H_{2}N-N{H}_2}{\to }$
|
$C{H}_3$
(ii)$C_6{H}_5-C{H}_3\underset{\left(b\right)H^{+}}{\overset{\left(a\right)KMn{O}_4/KOH}{\to }}$
(iii) $Ph-COOH\stackrel{B{r}_2/FeB{r}_3}{\to }$

Q. Write the IUPAC name of the given compound.