Question

Choose the correct option depicting the correct match of the given chemical changes and their characteristic.

Change	Characteristics
$1.{\mathrm{NaHCO}}_3\left(s\right)+{\mathrm{CH}}_3\mathrm{COOH}\left(l\right)\to {\mathrm{CO}}_2\left(g\right)+H_{2}O\left(l\right)+{\mathrm{CH}}_3\mathrm{COONa}\left(\mathrm{aq}\right)$	A.Formation of precipitate
$2.\mathrm{Fe}\left(s\right)+{\mathrm{CuSO}}_4\left(\mathrm{aq}\right)\to {\mathrm{FeSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}\left(s\right)$	B.Evolution of gas
$3.{\mathrm{BaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{Na}}_2\mathrm{SO}4\left(\mathrm{aq}\right)\to {\mathrm{BaSO}}_4\left(s\right)+2\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{BaSO}}_4\left(\mathrm{ppt}\right)$	C.Change in colour

• A. 1-B; 2-C and 3-A
• B. 1-A; 2-B and 3-C
• C. 1-B; 2-A and 3-C
• D. 1-C; 2-B and 3-A

Answer 1

The correct option is A 1-B; 2-C and 3-A

$1.{\mathrm{NaHCO}}_3\left(s\right)+{\mathrm{CH}}_3\mathrm{COOH}\left(l\right)\to {\mathrm{CO}}_2\left(g\right)+H_{2}O\left(l\right)+{\mathrm{CH}}_3\mathrm{COONa}\left(\mathrm{aq}\right)$In this reaction we can see the evolution of carbon dioxide gas.

$2.\mathrm{Fe}\left(s\right)+{\mathrm{CuSO}}_4\left(\mathrm{aq}\right)\to {\mathrm{FeSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}\left(s\right)$
In this reaction the blue coloured copper sulphate solution changes to green colour ferrous sulphate solution.


$3.{\mathrm{BaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{Na}}_2\mathrm{SO}4\left(\mathrm{aq}\right)\to {\mathrm{BaSO}}_4\left(s\right)+2\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{BaSO}}_4\left(\mathrm{ppt}\right)$In this reaction we can see a precipitate of barium sulphate(${\mathrm{BaSO}}_4$) is formed.

So the correct answer is option D.