S-block elements is one of the fundamental chapters and is needed to solve a variety of questions. Knowing the basic fundamental characteristics is important in solving many questions in competitive examinations. First let us look at the trend of the questions asked from this topic.
As you can see an average of 2 questions are asked from s-block for JEE mains and 1 question for JEE advanced. But s-block is one of the fundamental topics in Chemistry which has an effect on other topics as well.
The learning approach for s-block is similar to what we adopted for p-block, we learn its characteristics group wise, learn the trends, the characteristics and the exceptions in the group. There are some important compounds in each group whose creations and reactions should be thorough. The questions from s-block involve ordering based on periodic properties or theoretical questions, so being thorough with the topic as a whole is important.
One of the most important topics would be the trends in periodic characteristics, which include atomic radii, Electronic configuration and oxidation states. Other properties to learn under this would include flame color, photoelectric effects and the reducing properties.
Chemical properties have to be learnt as well. These include the reactions of s-block elements with hydrogen, oxygen, water and halogens. The important elements to learn under this group would be Lithium, Sodium, Magnesium and Calcium. Diagonal property plays an important role in s-block. Other than these topics, it is important to learn about some important compounds formed by s-block elements. These include washing soda, sodium bicarbonate, sodium hydroxide, quick lime, slaked lime, calcium carbonate, plaster and cement.