Advertisements
Advertisements
प्रश्न
What do you observe when H2S is passed through a lead nitrate solution.
Advertisements
उत्तर
When gas is passed to lead nitrate solution it also turns black.
\[\ce{\underset{\text{(colourless)}}{Pb(NO3)2} + H2S -> \underset{\text{(Black)}}{PbS} + 2HNO3}\]
APPEARS IN
संबंधित प्रश्न
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
What do you observe when Cobalt chloride paper is introduced in water vapour.
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.
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
Chemists identify gypsum as a natural indicator.
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
Heat may evolve or be absorbed during a ______ change.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
