Advertisements
Advertisements
प्रश्न
With the help of an appropriate example, justify that some of the chemical reactions are determined by the evolution of a gas.
Give a chemical equation for the reaction involved in the above case.
Give one example of a chemical reaction characterised by the evolution of a gas.
Advertisements
उत्तर
When zinc granules react with dilute sulphuric acid in a flask, hydrogen gas evolves, and zinc sulphate solution is formed.
\[\ce{Zn_{(s)} + H2SO4_{(aq)} -> ZnSO4_{(aq)} + H2_{(g)}}\]
Notes
Students should refer to the answer according to their questions.
APPEARS IN
संबंधित प्रश्न
How will you indicate the following effect in a chemical equation?
Endothermic reaction
Correct and balance the following equation:
\[\ce{N + H -> NH3}\]
Balance the following equation:
\[\ce{Na + O2 -> Na2O}\]
Balance the following equation:
\[\ce{Fe + O2 -> Fe2O3}\]
Chemical equations are balanced to satisfy the law of ______.
Give one example of a chemical reaction characterised by the formation of a precipitate.
State one characteristic of the chemical reaction which takes place when quicklime is treated with water.
Balance the following chemical equation:
\[\ce{Pb(NO3)2_{(s)} ->[Heat] PbO_{(s)} + NO2_{(g)} + O2_{(g)}}\]
Write word equation for the following skeletal equation:
\[\ce{KNO3 -> KNO2 + O2}\]
Balance the following equation. Also name the product formed.
`"Zn" + "HCI" → "ZnCI" _2 + "H"_2`
Write down what you understood from the following chemical reaction.
AgNO3(aq) + NaCI(aq) → AgCI ↓ + NaNO3(aq)
Balance the following equation:
HNO3 + H2S → NO2 + H2O + S
Write the balanced chemical equation of the following reaction.
silver nitrate → silver + nitrogen dioxide + oxygen
(a) Give only one suitable chemical test to identify the following gases.
- Ammonia
- Sulphur dioxide
- Hydrogen Chloride
- Chlorine
- Carbon Dioxide
- Oxygen
- Hydrogen
(b) Select a basic gas mentioned in Q.1 (a). How is the basic nature suspected?
(c)Select acidic gases from the gases mentioned in Q.1 (a). How is the acidic nature suspected?
(d) State the gas responsible for bleaching action.
(e)Which gas turn blue cobalt chloride paper light pink?
Grills of doors and windows are always painted before they are used.
Write word equation for the following molecular equation:
\[\ce{CaCO3 + 2HCl ->[\triangle] CaCl2 + H2O + CO2 [g]}\]
Word equation:
State which characteristic does [g] in the above reaction indicate. The word equation of:
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – mercury [II] oxide.
Balance the following simple equation:
\[\ce{Ca(OH)2 + HNO3 -> Ca(NO3)2 + H2O}\]
The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s)↓ + 2NaCl(aq) represents which of the following types of reaction?
What is a reactant in a chemical equation?
