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प्रश्न
What are catalysts?
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उत्तर
Catalyst is a substance which increases the rate of a reaction without causing any disturbance to it.
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संबंधित प्रश्न
The molecular formula of acetic acid is _________ .
(a) CH3COOH
(b) CH3 – CH3
(c) C6H6
(d) C2H4
What do you observe when you drop a few drops of acetic acid to test tubes containing
(a) phenolphthalein
(b) distilled water
(c) universal indicator
(d) sodium hydrogen carbonate powder
A student takes about 6 ml of distilled water in each of the four test tubes P, Q, R and S. He then dissolves an equal amount of four different salts namely, sodium chloride in 'P', potassium chloride in 'Q', calcium chloride in 'R' and magnesium chloride in 'S'. Next, he then adds 10 drops of soap solution to each test tube and shakes its contents. The test tubes in which scum (insoluble substance) is formed with soap are:
(A) P and Q
(B) Q and R
(C) R and S
(D) Q and S
Fill in the blanks from the choices given within brackets:
The basicity of acetic acid is-------- (3, 1, 4).
Give the name and structural formula of one homologue of HCOOH.
Write the formulae of ethanoic acid.
Three organic compounds A, B and C have the following molecular formulae: C4H10O
Which compound contains a carboxyl group? Write its name and structural formula.
What type of compound is formed when a carboxylic acid reacts with an alcohol in the presence of conc. H2SO4?
How is ethanoic acid obtained from ethanol? Write down the chemical equation of the reaction involved.
Ethanol can be oxidized to ethanoic acid. Write the equation and name the oxidizing agent.
Acetic acid is a typical acid. Write one equation in case of its reactions with a carbonate.
Explain the following term with an example.
Oxidant
Assertion (A): Esterification is a process in which a sweet-smelling substance is produced.
Reason (R): When esters react with sodium hydroxide an alcohol and sodium salt of carboxylic acid are obtained.
With a labelled diagram describe in brief an activity to show the formation of ester.
Ketone : –CO– : : Ester : _______
Write the answers to the questions by observing the following figure.
- Write the chemical reaction shown in the figure above in the form of a balanced equation.
- Write the name of the gas coming out of the large test tube in the above chemical reaction.
- Why do small bubbles appear in the small test tube?
- What is the change in colour of lime water?
Ester is formed by the reaction between ______.
What happens when a small piece of sodium is dropped in ethanol? Write the equation for this reaction.
Give the balanced chemical equation of the following reaction:
Oxidation of ethanol by acidified potassium dichromate.
A spatula full of sodium carbonate is taken in a test tube and 2 mL of dilute ethanoic acid is added to it.
Suggest a method of testing the gas liberated in the reaction.
