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प्रश्न
Give one example of an endothermic reaction.
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उत्तर
Example of endothermic reaction: Barium hydroxide on reacting with ammonium chloride produces ammonia, water and barium chloride. It also results in decrease in temperature, as it consumes heat energy.
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संबंधित प्रश्न
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are non-metals.
Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write a balanced chemical equation for this reaction. Name (i) oxidising agent, (ii) reducing agent, in this reaction.
Write word equation for the following skeletal equation:
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Write word equation for the following skeletal equation:
\[\ce{KNO3 -> KNO2 + O2}\]
Balance the following chemical equation :
Na2CO3 + HCl → NaCI + H2O + CO2
Balance the following equation:
Ca + N2 → Ca3N2
Balance the following equation:
Zn + KOH → K2ZnO2 + H2
Balance the following equation:
Fe2O3 + CO → Fe + CO2
Balance the following equation:
PbO + NH3 → Pb + H2O + N2
Balance the following equation:
Pb3O4 + HCl → PbCl2 + H2O + Cl2
Balance the following equation:
P + HNO3 → NO2 + H2O + H3PO4
Write the balanced chemical equation of the following reaction.
copper + nitric acid → copper nitrate + nitric oxide + water
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 – copper carbonate.
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Electrical energy
Name the following:
The silvery residue obtained on heating mercury [II] oxide.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
Pb(NO3)2 + 2NH4OH → 2NH4N03 + Pb(OH)2↓
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
State what is a ‘balanced equation’.
Balance the following simple equation:
\[\ce{N2 + H2 <=> NH3}\]
CaCO3 + 2HCl[dil.] → CaCl2 + H2O + CO2 [g]
State the information provided by the above chemical equation.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Cl2 + 2H2O + SO2 → 4HCl + H2SO4
