Advertisements
Advertisements
प्रश्न
(a) Design an activity to demonstrate the decomposition reaction of lead nitrate.
(b) Draw labelled diagram of the experimental set-up. List two main observations.
(c) Write balanced chemical equation for the reaction stating the physical state of the reactant and the products.
उत्तर
Activity to demonstrate the decomposition reaction of lead nitrate Pb(NO3)2
(a)
- Take about 2g of lead nitrate powder in a boiling tube.
- Hold the boiling tube with a pair of tongs and heat it over a flame, as shown in the figure.
- What do you observe? Note down the change, if any.
(b)
Two main observations:
- The emission of brown fumes of NO2 after thermal decomposition of Pb(NO3)2.
- The colourless compound Pb(NO3)2 forms a yellow compound PbO and brown fumes of NO2 gas.
(c)
\[\ce{\underset{(Lead nitrate)(solid)}{2Pb(NO3)2_{(s)}} ->[Heat]\underset{(Lead oxide)(solid)}{2PbO_{(s)}} + \underset{(Nitrogen dioxide)(gas)}{4NO2_{(g)}} + \underset{(Oxygen)(gas)}{O2_{(g)}}}\]
APPEARS IN
संबंधित प्रश्न
Taking into consideration the relationship in the first pair, complete the second pair
2H2 + O2 → 2H2O :Combination Reaction :: 2HgO → 2Hg + O2:_________
Rewrite the following statements by selecting the correct options:
\[\ce{CaCO3 ->[\Delta] CaO + CO2 ^}\] is a __________ reaction.
A solid substance P which is very hard is used in the construction of many buildings, especially flooring. When substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water with the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitate of substance T is formed. The substance T has the same chemical composition as starting substance P.
(a) What is substance P? Write its common name as well as chemical formula.
(b) What is substance Q?
(c) What is gas R?
(d) What is substance S? What is its clear solution known as?
(e) What is substance T? Name any two natural forms in which substance T occurs in nature.
What type of reaction is represented by the following equation?
CaCO3 → CaO + CO2
What type of reaction is represented by the following equation?
2 FeSO4 → Fe2 O3 + SO2 + SO3
What type of reaction is represented by the following equation?
NH4 CI → NH3 + HCI
What type of chemical reaction take place when electricity is passed through water?
Give a balanced equation for –
A thermal decomposition reaction involving heat on limestone [calcium carbonate]
Differentiate between the following:
Electrolytic decomposition and photochemical decomposition.
On heating blue coloured powder of copper (II) nitrate, in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed
- Write a balanced chemical equation of the reaction.
- Identify the brown gas X evolved.
- Identify the type of reaction.
- What could be the pH range of aqueous solution of the gas X?
