Q. What are ferromagnetic substance? Give one example?

Q. Complete the following chemical equations
i) $PbS+4O_3\to PbS{O}_4+...............$
ii) $Cu+2H_{2}S{O}_4\to CuS{O}_4+..............+2H_{2}O$
iii) $C{l}_2+2H_{2}O+S{O}_2\to ..............+2HCl$

Q. Write any two postulates of Werner's theory of coordination compounds.

Q. Answer in one word.
Which gas is evolved at cathode during the electrolysis of an aqueous solution of $NaCl$?

Q. How is chlorine prepared using $KMn{O}_4$?

Q. The rate constant of a certain first order reaction is 200 $s^{-1}$ What is its half life period?

Q. What is the role of following chemicals in food?
i) Saccharin
ii) Sodium benzoate

Q. Answer in one word:
Out of physisorption and chemisorption which on has lower enthalpy of adsorption?

Q. What is the action of dil $NaOH$ on ethanal (acetaldehyde)? Name the reaction.

Q. Answer in one word or one sentence:
Give the composition of copper matte.

Q. Answer in one word or one sentence:

Q. Answer in one word.
Name the law behind the dissolution of $C{O}_2$ gas in soft drinks under high pressure.

Q. Write the IUPC name of $\left[Pt\right(N{H}_3{)}_3\left(H_{2}O\right)C{l}_2]$.

Q. Calculate the packing efficiency in a Body Centered Cubic (BCC) lattice?

Q. Answer in one word or sentence.
What happens to the half life period of a first order reaction if the initial concentration of the reactants is increased?

Q. In the extraction of Aluminium by electrolysis:
i) Given the composition of electrolyte used
ii) Overall cell reaction
iii) Role of cryolite

Q. Why is $I_2$ less reactive than $ICl$?

Q.

Q. Zr and Hf have almost identical atomic radii give reason?

Q. Answer in one word or one sentence.

Q. Explain the hybridization, geometry and magnetic property of $[Co{F}_6{]}^{3-}$ on the basis of valence bond theory. [Z of Co = 27]

Q. Sliver forms a ccp lattice. The edge length of its unit cell is 408.6 pm. Calculate the density of sliver?$(N_A=6.022\times {10}^{23}$, Atomic mass of $Ag=108gmo{l}^{-1})$

Q. Explain Kolbe's reaction.

Q. Calculate the spin only magnetic moment of $F{e}^{2+}$.[ At. no. = 26]

Q. Why $S{c}^{3+}$ salts are colorless whereas $C{r}^{3+}$ salt are coloured?

Q. Answer in one word:
Which hormone regulates the sugar level in the blood?

Q. Noble gases are chemically inert. Give one reason.

Q. What are antifertility drugs? Give an example.

Q. Write the balanced Chemical equation with condition involved in manufacture of nitric acid by ostwald's process.

Q. Write the balanced equations in the manufacture of $K_{2}C{r}_2{O}_7$ from Chromite Ore.