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प्रश्न
What do you understand by exothermic reactions?
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उत्तर
Exothermic reaction is the chemical reaction that produces heat along with products.
Example: CaO + H2O → Ca(OH)2 + Heat
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संबंधित प्रश्न
What is a balanced chemical equation? Why should a chemical equation be balanced?
On what basis is a chemical equation balanced?
Balance the given equation:
AI(OH)3 
AI2O3 +H2O
Fill in the following blank with suitable word:
Chemical equations are balanced to satisfy the law of ............
What is meant by chemical reaction? Explain with the help of an example.
The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.
(a) What is metal M?
(b) What is solution S? Is it acidic or alkaline?
(c) What is gas G?
(d) Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
(e) Is this reaction exothermic or endothermic?
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What is the limitation of the reaction given in question 2?
What information do the following chemical equations convey? Mg + 2HCl → MgCl2+ H2
Choose the correct alternative and rewrite the following sentence.
Which of the following is not required to find the pH of a given solution?
Write word equation for the following molecular equation:
CaO + H20 → Ca (OH)2 + Δ
Word equation:
State why [+ Δ ] is not written in the reaction, if ZnO reacts with H2O.
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
Is the equation given above a balanced equation. Give reasons.
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
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Write an Explanation.
Balanced equations
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?
- In beakers A and B, exothermic process has occurred.
- In beakers A and B, endothermic process has occurred.
- In beaker C exothermic process has occurred.
- In beaker C endothermic process has occurred.
