Advertisements
Advertisements
प्रश्न
Explain, all alkalis are bases but all bases are not alkalis.
Advertisements
उत्तर
An alkali is a base which is soluble in water but all bases are not water soluble.
For example Ferric hydroxide [Fe(OH)3] and cupric hydroxide [ Cu(OH)2 ] are bases but these are not soluble in water but sodium hydroxide NaOH, calcium hydroxide Ca(OH)2 are bases and are also soluble in water.
Hence it is rightly said that all alkalis are bases but all bases are not alkalis.
Concept Insight : An alkali is a basic hydrooxide which when dissolved in water produces hydroxyl (OH-) ions as the only negatively charged ions.
Example : NaOH(aq) ⇌ Na+ + OH-
APPEARS IN
संबंधित प्रश्न
Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?
A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish-brown. On rinsing the shirt with plenty of water, the reddish-brown stain turns yellow again.
What is the nature of soap (acidic/basic) as shown by the indicator present in curry stain?
Name an acid used to remove ink spots.
Two acids ‘A’ and ‘B’ are given. Acid A gives one hydrogen ion per molecule of the acid in solution. Acid B gives two hydrogen ions per molecule of the acid in solution.
- Find out acid A and acid B.
- Which acid is called the King of Chemicals?
Which of the following is an acid-base indicator?
Fill in the cross word given in figure with the help of the clues provided.
Across
(2) The solution which does not change the colour of either red or blue litmus.
(4) Phenolphthalein gives pink colour in this type of solution.
(7) Colour of blue litmus in lemon juice.
Down
(1) It is used to test whether a substance is acidic or basic.
(3) It is a natural indicator and gives pink colour in basic solution.
(5) Nature of ant’s sting.
(6) It is responsible for the increase in temperature during a neutralisation reaction.
Write the important uses of hydrochloric acid and sulphuric acids.
Name the acid present in the given table.
Curd contains ______ acid.
In a set of the given reactions, acetic acid yielded a product C.
\[\begin{array}{cc}
\phantom{}\ce{\underset{}{CH3COOH + PCl5} ->[][ ] \underset{}{A}->[C6H6][anhy.AlCl3 ] \underset{}{B}->[C2H5MgBr][Ether] \underset{}{C}}\\
\end{array}\]
Product C would be:
