You visited us 1 times! Enjoying our articles? Unlock Full Access!

Oxides of Sulphur

Two zinc rods...

Question

Two zinc rods are placed in contact with dilute $H_{2} S O_{4}$ and conc. $H_{2} S O_{4}$ in two separate containers $A$ and $B$ . The characteristic gases evolved in the containers are respectively :

the gas in container '

A

' turns

K_{2} {C r}_{2} O_{7}

green and the gas in container '

B

' turns lead acetate black

No worries! We‘ve got your back. Try BYJU‘S free classes today!

A \to

Pungent smelling gas,

B \to

colourless, odourless gas

No worries! We‘ve got your back. Try BYJU‘S free classes today!

A \to

Inflammable gas,

B \to

Turns

K_{2} {C r}_{2} O_{7}

green

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

A \to

Can react with

O_{2}

explosively,

B \to

No reaction with

O_{2}

at all

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B $A \to$ Inflammable gas, $B \to$ Turns $K_{2} {C r}_{2} O_{7}$ green
Dil. sulphuric acid reacts with zinc to give zinc sulphate and hydrogen gas. Hydrogen is inflammable and burns with a pop sound when a flame is brought near it.
$Z n + d i l . H_{2} S O_{4} \to Z n S O_{4} + H_{2}$

When conc. sulphuric acid reacts with zinc, zinc sulphate, sulphur dioxide and water are formed. Sulphur dioxide turns potassium chromate into green.
$Z n + c o n c . 2 H_{2} S O_{4} \to Z n S O_{4} + S O_{2} + 2 H_{2} O$

Suggest Corrections

Similar questions

Q. A mixture contains,

{C O}_{3}^{2 -}

{S O}_{3}^{2 -}

and

{S O}_{4}^{2 -}

.
If scheme given to identify above unknowns is true enter 1, if false enter 0.
Add dil.

H C l

, brisk reaction with pungent odour gas indicates

{S O}_{3}^{2 -}

(and also

{C O}_{3}^{2 -}

, pungent gas is

{S O}_{2}

). Add

K_{2} {C r}_{2} O_{7}

solution. If mixture turns green then

{S O}_{3}^{2 -}

is confirmed. Pass the evolved gas into lime water, if it turns milky,

{C O}_{3}^{2 -}

is confirmed.

[X] + H_{2} {S O}_{4} ⟶ [Y]

a colourless gas with irritating smell

[Y] + K_{2} {C r}_{2} O_{7} + H_{2} {S O}_{4} ⟶

green solution
[X] and [Y] are:

Q. Two zinc rods are placed in contact with dil.

H N O_{3}

and conc.

H N O_{3}

in two separate containers A and B. The characteristics of gases evolved in the containers are respectively:

{S O}_{2}

and

{C O}_{2}

both turn lime water (A) milky,

{S O}_{2}

also turns

K_{2} {C r}_{2} O_{7} / H^{+}

(B) green while

O_{2}

is soluble in pyrogallol (C) turning it black. These gases are to be detected in order by using these reagents. The order is :

Q. If acidified solution of

K_{2} {C r}_{2} O_{7}

turns green on addition of a salt then salt may contain :

Join BYJU'S Learning Program

Two zinc rods are placed in contact with dilute H2SO4 and conc.H2SO4 in two separate containers A and B. The characteristic gases evolved in the containers are respectively :

Two zinc rods are placed in contact with dilute $H_{2} S O_{4}$ and conc. $H_{2} S O_{4}$ in two separate containers $A$ and $B$ . The characteristic gases evolved in the containers are respectively :