Basic Lead Carbonate

Q.

What happens when sodium carbonate is added to sodium hydroxide?

Q.

An aqueous solution of a salt (A) gives white precipitate (B) with sodium chloride solution. The filtrate gives a black precipitate. (C) When $H_{2}S$ is passed into it. Compound (B) dissolves in hot water and the solution gives a yellow precipitate (D) on treatment with sodium iodide. The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating. Identify the compound (A) to (D).

1. $A=Pb(N{O}_3{)}_{2}B=PbC{l}_{2}C=PbSD=Pb{l}_2$

2. $A=PbS{O}_{3}B=PbC{l}_{2}C=PbClD=Pb{O}_2$

3. $A=Pb{l}_{2}B=PbOC=Pb{H}_{4}D=Pb(N{O}_3{)}_2$

4. $A=PbSB=PbC{l}_{2}C=Pb(N{O}_3{)}_{2}D=Pb{l}_2$

Q. Which of the following halides is least stable and has doubtful existence -

1. $CC{l}_4$
2. $Ge{I}_4$
3. $Sn{I}_4$
4. $Pb{I}_4$

Q. Correct sequence of $CO$ bond order in given compounds is:
$\left(P\right)Fe(CO{)}_5$
$\left(Q\right)CO$
$\left(R\right)H_{3}B\leftarrow CO$
$\left(S\right)\left[Mn\right(CO{)}_5{]}^{-}$

1. $Q>S>P>R$
2. $S>P>R>Q$
3. $P>R>S>Q$
4. $R>Q>P>S$

Q. A water sample has ppm level concentration of follwing anions $F^{-}=10;S{O}_3^{2-}=100;N{O}_3^{-}=50$ the anion/ anions that make \ makes the water smaple unsuitable for drinking is / are :

1. only $N{O}_3^{-}$
2. both $S{O}_4^{2-}$ and $N{O}_3^{-}$
3. only $F^{-}$
4. only $S{O}_4^{2-}$

Q. Which of the following halides is least stable and has doubtful existence?

1. $CC{l}_4$
2. $Ge{I}_4$
3. $Sn{I}_4$
4. $Pb{I}_4$

Q. The correct statement for the molecule $Cs{I}_3$ is:

1. It contains $C{s}^{3+}$ and $I^{-}$ ions
2. It contains $C{s}^{+}$ and $I_3^{-}$ ions
3. It contains $C{s}^{+}$, $I^{-}$ and lattice $I_2$ molecule
4. It is a covalent molecule