Advertisements
Advertisements
प्रश्न
In order to study saponification reaction, we first prepare 20% solution of sodium hydroxide. If we record the temperature of this solution just after adding sodium hydroxide flakes to water and also test its nature using litmus, it may be concluded that the process of making this solution is
(A) exothermic and the solution is alkaline
(B) endothermic and the solution is alkaline
(C) endothermic and the solution is acidic
(D) exothermic and the solution is acidic
Advertisements
उत्तर
Dissolution of sodium hydroxide in water evolves large amount of heat. Thus, it is an exothermic reaction. Since sodium hydroxide is a base, its solution in water will be alkaline when tested with litmus paper (red litmus turns blue).
Hence, the correct option is A.
APPEARS IN
संबंधित प्रश्न
Complete the following chemical equations:
C2H5OH+CH3COOH`("conc."H_2SO_4)/`>
Give the structural formulae of acetic acid.
Which of the following observations is true about dilute solution of acetic acid?
(A) It smells like vinegar and turns red litmus blue
(B) It smells like onion and turns blue litmus red
(C) It smells like orange and turns red litmus blue
(D) It smells like vinegar and turns blue litmus red
What type of compound is formed by the reaction between acetic acid and an alcohol?
Ethanoic acid _________.
With a labelled diagram describe in brief an activity to show the formation of ester.
CH3–CH2–CHO : propanal : : CH3–COOH : _______
Ester is a sweet-smelling compound.
Which of the following represents saponification reaction?
Observe the diagram given below and answer the questions:
- Name the reactants in this reaction.
- Which gas comes out as effervescence in the bigger test tube?
- What is the colour change in the lime water?
- In the above experiment instead of sodium carbonate which chemical can be used to get same products?
- Write the use of acetic acid.
