Lead Acetate

Q.

A white coloured inorganic salt gives the following reactions.

(i) It is soluble in water and the solution has sweet taste.
The solution turns black in presence of $H_{2}S$
ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water.

iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

1. NaCl

2. Sn(HCOO)₂

3. Pb(CH₃COO)₂

4. CaCO₃

Q. Which of the following statement(s) is/are correct when a mixture of $NaCl$ and $K_{2}C{r}_2{O}_7$ is gently warned with conc. $H_{2}S{O}_4$?

1. A deep red vapour is evolved
2. The vapours when passed into $NaOH$ solution gives a yellow solution of $N{a}_{2}Cr{O}_4$
3. Chlorine gas is evolved
4. Chromyl chloride is formed

Q.

In the Baeyers process:

1. $A{l}_2{O}_3$ goes into solution as soluble $Al(OH{)}_4^{-}$ while other basic oxides as $Ti{O}_2$ and $F{e}_2{O}_3$ remain insoluble.
2. $A{l}_2{O}_3$ changes to AIN which in turn decomposed by $H_{2}O$
3. None of the above is correct
4. $A{l}_2{O}_3$ changes to $A{l}_2(C{O}_3{)}_3$ which changes to $AlC{l}_3$

Q. From $B_2{H}_6$, all the following can be prepared except :

1. $H_{3}B{O}_3$
2. $B_2{O}_3$
3. $B_2(C{H}_3{)}_6$
4. $NaB{H}_4$

Q.

81. Identify the correct sequence of given steps for the conversion of calcium carbide to methyl alcohol.

(1) reaction with aqueous $\mathrm{KOH}$

(2) hydrolysis

(3) reaction with soda lime

(4) reaction with ${\mathrm{HgSO}}_4/{\mathrm{H}}_2{\mathrm{SO}}_4$

(5) reaction with ${\mathrm{HgSO}}_4$

(6) reaction with ${\mathrm{PCl}}_5$

1. 2 4 5 3 6 1

2. 2 4 3 1 6 5

3. 2 6 4 5 1 3

4. 4 2 3 5 6 1

Q. Lead Acetate when reacts with `A', gives black ppt

1. $PbC{l}_2$
2. $PbC{O}_3$
3. $PbCr{O}_4$
4. $PbS$

Q.

A white coloured inorganic salt gives the following reactions.

(i) It is soluble in water and the solution has sweet taste.
The solution turns black in presence of $H_{2}S$
ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water.

iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

1. NaCl

2. $Sn(HCOO{)}_2$

3. $Pb(C{H}_{3}COO{)}_2$

4. $CaC{O}_3$

Q. Complete the missing links $\left(X\right),\left(Y\right)$ and $\left(Z\right)$ by making appropriate choice.
$C{H}_{3}COOH\stackrel{PB{r}_3/B{r}_2}{\to }X\stackrel{KCN}{\to }Y\stackrel{H_3{O}^{+}}{\to }Z$

1. $X=C{H}_{3}COBrY=C{H}_{3}COCNZ=C{H}_{3}COOH$
2. $X=BrC{H}_{2}COOHY=\underset{CN}{\underset{|}{C}{H}_2}COOHZ=HOOC-C{H}_{2}COOH$
3. $X=BrC{H}_{2}COOHY=C{H}_2\left(CN\right)COOHZ=\underset{COOH}{\underset{|}{C}OOH}$
4. $X=B{r}_{2}CHCOOHY=B{r}_{2}C\left(CN\right)COOHZ=C{H}_{3}C{H}_{2}COOH$

Q. Assertion :Sulphuric acid was called 'oil of vitriol'. Reason: Medieval alchemists prepared by roasting green vitriol iron sulphate in iron retort and known as oil of vitriol.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Which of the following metal carbonates decomposes on heating ?

1. $K_{2}C{O}_3$
2. $MgC{O}_3$
3. $L{i}_{2}C{O}_3$
4. $N{a}_{2}C{O}_3$

Q. The % by volume of $C_3{H}_8$ in a mixture of $C_3{H}_8$, $C{H}_4$ and $CO$ is 36.5 . Calculate the volume of $C{O}_2$ produced when 100 ml of the mixture is burnt in excess of $O_2$ .

1. 173ml
2. 237ml
3. 475ml
4. 650ml

Q. Assertion :At high temperatures the sodium sulphate or potasium sulphate formed, forms a crust and sticks to the glass apparatus. Reason: The non volatile residue of the metal sulphate remains in the vessel. The dissolved nitrogen oxides are removed at reduced pressure to give fuming nitric acid.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. If edible oil is allowed to stand for a long time in an iron or tin container, the oil becomes rancid.

1. True
2. False

Q. Lead Acetate when reacts with `A', gives black ppt

1. PbCl₂

2. PbCrO₄

3. 

4. PbCO₃

Q.

A white coloured inorganic salt gives the following reactions.

(i) It is soluble in water and the solution has sweet taste.
The solution turns black in presence of $H_{2}S$
ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water.

iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

1. NaCl

2. $Sn(HCOO{)}_2$

3. $Pb(C{H}_{3}COO{)}_2$

4. $CaC{O}_3$

Q. Edible oils shows rancidity when stored for long period.

1. True
2. False

Q. The alkaline earth metal whose carbonate has no natural occurrence is:

1. Ba
2. Ca
3. Mg
4. Be

Q.

A white coloured inorganic salt gives the following reactions.

(i) It is soluble in water and the solution has sweet taste.
The solution turns black in presence of $H_{2}S$
ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water.

iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

1. NaCl

2. $Sn(HCOO{)}_2$

3. $Pb(C{H}_{3}COO{)}_2$

4. $CaC{O}_3$