Home
Class 10
CHEMISTRY
When a little sulphur in a spoon is heat...

When a little sulphur in a spoon is heated,it burns with a blue flame which slowly disappears after some time and we can feel a pungent odour. This pungent odour is due to

A

carbon dioxide

B

sulphur dioxide

C

sulphur gas

D

sulphuric acid

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Experiment**: When sulfur is heated in a spoon, it undergoes a combustion reaction. This means that sulfur reacts with oxygen from the air. 2. **Observation of Flame**: Initially, when sulfur is heated, it burns with a blue flame. This indicates that a chemical reaction is taking place, and the blue flame suggests that the combustion is complete. 3. **Disappearance of Flame**: After some time, the blue flame disappears. This could be due to the depletion of sulfur or oxygen, or the reaction reaching a point where it no longer produces visible flames. 4. **Pungent Odor**: Following the disappearance of the flame, a pungent odor is noticed. This odor is a key indicator of a specific gas being produced during the reaction. 5. **Identifying the Gas**: The gas responsible for the pungent odor is sulfur dioxide (SO2). When sulfur (S) burns in the presence of oxygen (O2), it forms sulfur dioxide according to the reaction: \[ S + O_2 \rightarrow SO_2 \] 6. **Conclusion**: Therefore, the pungent odor observed is due to the evolution of sulfur dioxide gas during the combustion of sulfur. **Final Answer**: The pungent odor is due to the evolution of sulfur dioxide (SO2) gas. ---
**Step-by-Step Solution:** 1. **Understanding the Experiment**: When sulfur is heated in a spoon, it undergoes a combustion reaction. This means that sulfur reacts with oxygen from the air. 2. **Observation of Flame**: Initially, when sulfur is heated, it burns with a blue flame. This indicates that a chemical reaction is taking place, and the blue flame suggests that the combustion is complete. 3. **Disappearance of Flame**: After some time, the blue flame disappears. This could be due to the depletion of sulfur or oxygen, or the reaction reaching a point where it no longer produces visible flames. ...
Promotional Banner

Topper's Solved these Questions

  • ACIDS , BASES AND SALTS

    MCGROW HILL PUBLICATION|Exercise HIGHER ORDER THINKING QUESTIONS|10 Videos

  • CARBON

    MCGROW HILL PUBLICATION|Exercise HIGHER ORDER THINKING QUESTIONS|10 Videos

Similar Questions

Explore conceptually related problems

When stirred with a spoon and left, water comes to rest after some time. It occurs due to

A gas is evolved which burns with blue flame when the mixture is heated with conc. H_(2)SO_(4) . The mixture contains.

When a colourless gas (A), which is poisonous and burns with blue flame, is passed through aqueous NaOH solution, gives a compound (B) . Compound (B) on heating gives (C ) . (C ) gives a white precipitate (D) with CaCl_(2) . Both (C ) and (D) decolourises KMnO_(4) . Identify (A) to (D) .

A long silver teaspoon is placed in a cup filled with hot tea. After some time, the exposed end (the end which is not dipped in tea) of the spoon becomes hot even without direct contact with the tea. This phenomenon can be explained mainly by

A compound (A) is used in paints instead of salts of lead. . Compound(A) is obtained when a white compound (B) is strongly heated . Compound (B) is insoluble in water but dissolves in sodium hydroxide forming a solution of compound (C ) the compounds (A) on heating with coke gives a metal (D) and a gas (E) which burns with blue flame . (B) also dissolves in ammonium sulphate solution mixed with ammonium hydroxide. solution of compound (A) in dilute HCl gives a bluish white//white precipitate (F) with excess of (F) with excees of K_(4)[Fe(CN)_(6)] identify (A) to (F) and explain the reactions.

When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out. Name the iron salt.