Three beakers labelled as A, B and C each containing 25 mL of water was 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?
(i) In beakers A and B, exothermic process has occurred.
(ii) (ii) In beakers A and B, endothermic process has occurred.
(iii) (iii) In beaker C exothermic process has occurred.
(iv) (iv) In beaker C endothermic process has occurred.
(a) (i) only (b) (ii) only (c) (i) and (iv)
Answers
Endothermic reaction : In endothermic reaction , heat energy is absorbed. Hence , they make the surroundings temperature fall.
Exothermic reaction : In exothermic reaction , heat energy is released. It makes the temperature of the surroundings rises.
We are given that three beakers containing 25 ml of water are named as A , B and C. Later a small amount of NaOH , anhydrous CuSO₄ and NaCl were added to A , B and C beakers. After adding the substances , the reaction took place We are given that there was an increase in temperature in Beaker A and B and where as in beaker B temperature Falls.
• Now , In Beaker A and B Exothermic reaction took place. Because , the temperature has increased. Where as in Beaker C Endothermic reaction took place. Because the temperature is decreased.
Now coming to the given statements , (i) and (iv) are correct.
The option which contains (i) and (iv) is option(c)
Hence , Option(c) is the required answer.
Answer:
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Requiredanswer:−
Endothermic reaction : In endothermic reaction , heat energy is absorbed. Hence , they make the surroundings temperature fall.
Exothermic reaction : In exothermic reaction , heat energy is released. It makes the temperature of the surroundings rises.
We are given that three beakers containing 25 ml of water are named as A , B and C. Later a small amount of NaOH , anhydrous CuSO₄ and NaCl were added to A , B and C beakers. After adding the substances , the reaction took place We are given that there was an increase in temperature in Beaker A and B and where as in beaker B temperature Falls.
• Now , In Beaker A and B Exothermic reaction took place. Because , the temperature has increased. Where as in Beaker C Endothermic reaction took place. Because the temperature is decreased.
Now coming to the given statements , (i) and (iv) are correct.
The option which contains (i) and (iv) is option(c)
Hence , Option(c) is the required answer.