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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
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
How does ethanoic acid react with sodium hydrogen carbonate? Give equation of the reaction which takes place.
A neutral organic compound is warmed with some ethanoic acid and a little of conc. H2SO4. Vapours having sweet smell (fruity smell) are evolved. What type of functional group is present in this organic compound?
Ethanol can be oxidized to ethanoic acid. Write the equation and name the oxidizing agent.
Write the names of three compounds which can be oxidised directly or in stages to produce acetic acid.
The next higher homologue of ethanoic acid is ______.
Acetic acid is a typical acid. Write one equation in case of its reactions with a bicarbonate.
What type of compound is formed by the reaction between acetic acid and an alcohol?
Write the chemical equation for the following:
Combustion of methane
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.
Ester is a sweet-smelling compound.
Explain the following reaction with an example.
Saponification
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 of lime appear in the small test tube?
- What is the change in colour of lime net?
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
Which of the following substance produces brisk effervescence with baking soda solution?
Bubbles are seen in the test tube during the preparation of lime water.
Write the chemical equation for the following:
Saponification Reaction
Give the balanced chemical equation of the reaction.
Oxidation of ethanol by acidified potassium dichromate.
