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प्रश्न
What information does the following chemical equation convey?
Zn + H2SO4 → ZnSO4+ H2
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उत्तर
This equation conveys the following information:
The actual result of a chemical change.
Substances take part in a reaction, and substances are formed as a result of the reaction.
Here, one molecule of zinc and one molecule of sulphuric acid react to give one molecule of zinc sulphate and one molecule of hydrogen.
Composition of respective molecules, i.e. one molecule of sulphuric acid contains two atoms of hydrogen, one atom of sulphur and four atoms of oxygen.
Relative molecular masses of different substances, i.e. molecular mass of
Zn = 65
H2SO4 = (2+32+64) = 98
ZnSO4 = (65+32+64) = 161
H2 = 2
22.4 litres of hydrogen are formed at STP.
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संबंधित प्रश्न
A metal X forms a salt XSO4. The salt XSO4 forms a clear solution in water which reacts with sodium hydroxide solution to form a blue precipitate Y. Metal X is used in making electric wires and alloys like brass.
- What do you think metal X could be?
- Write the name, formula and colour of salt XSO4.
- What is the blue precipitate Y?
- Write a chemical equation of the reaction which takes place when salt XSO4 reacts with sodium hydroxide solution. Give the state symbols of all the reactants and products which occur in the above equation.
Write word equation for the following skeletal equation:
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Balance the following equation. Also name the product formed.
`"NaNO"_3 → "NaNO"_2 + "O"_2` Name of product (s)
Balance the equation stepwise.
NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + H2O(l)
Balance the following equation:
\[\ce{S + HNO3 -> H2SO4 + NO2 + H2O}\]
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the mass of acid required.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{Na2SO3 + 2HCl ->[\triangle] 2NaCl + H2O + SO2}\]
Balance the following simple equation:
K + H2O → KOH + H2
Write a balanced equation for the following word equation:
Potassium bicarbonate → Potassium carbonate + Water + Carbon dioxide
Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.
