Question

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 solution contained in beakers A
and B whereas in case of beaker C , the temperature of the solution fell. Which one of the following statement is correct?

(i) In beakers A and B exothermic process has occurred
(Ii) In beaker A and B endothermic process has occurred
(iii) In beaker C exothermic process has occurred
(iv) In beaker C endothermic process has occurred

(a) i only
(b) ii only
(c) i & iv only
(d) ii & iii only

Answer 1

When heat is released (Exothermic process) surrounding gets warm means temperature rises. 

When heat is released (Exothermic process) surrounding gets warm means temperature rises. When heat is absorbed (Endothermic process) surrounding gets cold means temperature falls.

beaker A:

When heat is released (Exothermic process) surrounding gets warm means temperature rises. When heat is absorbed (Endothermic process) surrounding gets cold means temperature falls.In beaker A:NaOH+H2O→Na++OH−+H2O+heat 

In beaker B:

When heat is released (Exothermic process) surrounding gets warm means temperature rises. When heat is absorbed (Endothermic process) surrounding gets cold means temperature falls.In beaker A:NaOH+H2O→Na++OH−+H2O+heat In beaker B:CuSO4(s)+5H2O(l)→CuSO4.5H2O(s)+heat

In beaker B:CuSO4(s)+5H2O(l)→CuSO4.5H2O(s)+heatTherfore in both A and B exothermic reactions are taking place resulting in rise in temperature. On the other hand in beaker C, an endothermic reaction is taking place as heat is being absorbed, resulting in a decrease in temperature.

When heat is released (Exothermic process) surrounding gets warm means temperature rises. When heat is absorbed (Endothermic process) surrounding gets cold means temperature falls.In beaker A:NaOH+H2O→Na++OH−+H2O+heat In beaker B:CuSO4(s)+5H2O(l)→CuSO4.5H2O(s)+heatTherfore in both A and B exothermic reactions are taking place resulting in rise in temperature. On the other hand in beaker C, an endothermic reaction is taking place as heat is being absorbed, resulting in a decrease in temperature.NaCl+H2O+heat→Na++Cl−+H2O

Final answer (c)

brainliest please

Answer 2

Answer:

Option c is correct

Explanation:

In beaker A and B temperature is increasing which means heat is releasing and release of heat is known as exothermic, In beaker C the temperature fells down which means heat is absorbed therefore it is a endothermic reaction