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प्रश्न
Is Decomposition of calcium carbonate an endothermic reaction or an exothermic reaction?
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उत्तर
Decomposition of calcium carbonate: Endothermic reaction
Decomposition of calcium carbonate is an endothermic reaction because it needs energy to decompose into carbon dioxide and calcium oxide.
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संबंधित प्रश्न
Balance the following chemical equation.
\[\ce{NaCl + AgNO3 -> AgCl + NaNO3}\]
Convey the following information in the form of a balanced chemical equation:
"An aqueous solution of ferrous sulphate reacts with an aqueous solution of sodium hydroxide to form a precipitate of ferrous hydroxide and sodium sulphate remains in solution."
With the help of an appropriate example, justify that some of the chemical reactions are determined by Evolution of a gas.
Give chemical equation for the reaction involved in the above case.
When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory.
(a) What could be solid X? Write its chemical formula.
(b) What could be product Y? Write its chemical formula.
(c) What is the common name of the solution of Y which is used for testing carbon dioxide gas?
(d) Write chemical equation of the reaction which takes place on adding water to slid X.
(e) Which characteristic of chemical reactions is illustrated by this example?
Write symbolic representation for the following word equation and balance them :
Calcium carbonate → Calcium oxide + Carbon dioxide.
Explain the terms with examples.
Balanced equation
What is the limitation of the reaction given in question 2?
Balance the following equation:
Fe2O3 + CO → Fe + CO2
Balance the following equation:
PbO + NH3 → Pb + H2O + N2
Write the balanced chemical equation of the following reaction. potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
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\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
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\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
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| Column A | Column B |
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| (b) Orange coloured compound changes to green. | (ii) Iodine |
| (c) Red compound changes to brown and then yellow. | (iii) Zinc Nitrate |
| (d) White to yellow when hot and white when cold. | (iv) Copper sulphate |
| (e) Violet solid changes to violet vapours. | (v) Red Lead |
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When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
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\[\ce{NH3 [g] + HCl [g] ⇌ NH4Cl [s]}\]
Word equation:
State which characteristic is observed in the above reaction.
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Balance the following simple equation:
Zn + HCl → ZnCl2 + H2
Balance the following simple equation:
H2 + O2 → H2O
Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.
