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प्रश्न
Give a chemical test to distinguish between the following gases.
NH3 and SO2
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उत्तर
| Ammonia (NH3) | Sulphur dioxide (SO2) | |
| Litmus test | Moist red litmus blue. | Moist blue litmus red. |
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संबंधित प्रश्न
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Complete and balance the following reaction:
\[\ce{Pb(NO3)2 ->[\Delta]}\]
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
Give an example of a chemical reaction for the following situation:
A change in colour is observed
Write a note on the following:
Curdling of milk
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
