Question 3 :
Which of the following is the true statement for carbon atoms :<br/>

Question 5 :
Compounds within a homologous series typically have a fixed set of :

Question 6 :
When 2 hydrogen atoms combine to form $H_2$ molecule, the system ______ .

Question 11 :
<b></b>Sodium or potassium salts of higher fatty&#160;acids are termed as :

Question 16 :
Compounds having the same general formula &amp; similar chemical properties are part of homologous series.&#160;<br/><br/>

Question 21 :
Assertion: Small quantity of soap is used to prepare a stable emulsion. Reason: Soap lowers the interfacial tension between oil and water.

Question 22 :
A student takes about 4 ml of distilled water in four test tubes marked $P, Q, R$ and $S$. He then dissolves in each test tube, an equal amount of various salts, viz. sodium sulphate in $P$, potassium sulphate in $Q$, calcium sulphate in $R$ and magnesium sulphate in $S$. After that, he adds an equal amount of soap solution in each test tube. On shaking each of these test tubes well, he observes a good amount of lather (foam) in the test tube marked:<br/>