Advertisements
Advertisements
प्रश्न
The chemical reaction between quicklime and water is characterised by ______.
पर्याय
evolution of hydrogen gas.
formation of slaked lime precipitate.
change in temperature of mixture.
change in colour of the product.
Advertisements
उत्तर
The chemical reaction between quicklime and water is characterised by change in temperature of mixture.
Explanation:
When quicklime (calcium oxide, CaO) reacts vigorously with water (H2O), it forms slaked lime, calcium hydroxide (Ca(OH)2). This combination process is highly exothermic, meaning it releases a large amount of heat. As a result, the temperature of the reaction mixture rises sharply, often making the water boil and producing a distinct hissing sound.
APPEARS IN
संबंधित प्रश्न
Translate the following statement into a chemical equation and then balance the equation:
Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide.
Write a complete balanced equation for the following reaction:
\[\ce{Sulphur dioxide (gas) + Oxygen (gas) -> Sulphur trioxide (gas)}\]
Balance the following equations:
\[\ce{Al(OH)3 -> Al2O3 + H2O}\]
State one characteristic of the chemical reaction which takes place when wax is burned in the form of a candle.
When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
- Name any two metals which can behave like metal X.
- Name any two acids which can behave like acid Y.
- Name the gas Z.
- Is the gas Z lighter than or heavier than air?
- Is the reaction between metal X and dilute acid Y exothermic or endothermic?
- By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.
What happens when silver nitrate solution is added to sodium chloride solution?
- Write the equation for the reaction which takes place.
- Name the type of reaction involved.
Write word equation for the following skeletal equation:
\[\ce{Ca + O2 → CaO}\]
Write your observation for the following chemical reaction and name the product formed :
When dilute acetic acid is poured on baking soda.
Write your observation for the following chemical reaction and name the product formed :
When water is added to quick lime?
Dry raisins were soaked in water for 2 hours, to determine the percentage of water absorbed by raisins. Before final weighing of swollen raisins, the extra water left on the surface of soaked raisins was removed by:
Write the chemical equation for the following word equation and balance them.
Magnesium + Sulphuric acid → Magnesium sulphate + Hydrogen
Balance the following equation:
\[\ce{S + HNO3 -> H2SO4 + NO2 + H2O}\]
Write the balanced chemical equation of the following reaction.
Potassium permanganate + hydrochloric acid → potassium chloride + manganese chloride + chlorine + water
Write the balanced chemical equation of the following reaction.
aluminium + sodium hydroxide + water → sodium meta aluminate + hydrogen
Considering the relationship in the first pair, complete the second paie :
AgCI : White :: CuI2 : ___________
Write word equation for the following molecular equation:
CuCo3 → CuO + CO2 [g]
Word equation:
State the characteristics or indications occurring in the above reaction.
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
Write the word equation for the above molecular equation.
Explain the term ‘chemical equation’.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Fe2O3 + 2H2 → 2Fe + 3H2O
The following reaction is an example of a `4"NH"_3("g") + "SO"_2 -> 4"NO"("g") + 6"H"_2"O"("g")`
- displacement reaction
- combination reaction
- redox reaction
- neutralisation reaction
