Question

Answer the following questions.
3. The ph of an aqueous solution decrease from 3 to 2 what will ha
to the nature of the solution.
4. State Mendeleev's periodic law.
Answer the following questions.
5. An element X' has mass number 35 and number of neutron is 18,
identify group, block, and period of the element X
6. Explain why an aqueous solution of Sodium sulphate is neutral
while an aqueous Solution of sodium carbonate is basic in nature
7. Define the following.
a) Homologous series.
b) Catenation
IV. Answer the following questions.
8. Write the structure and Chemical formula of following.
i) Ethanoic acid ii) Cyclobutane. iii) Benzene​

Answer 1

Answer:

3. Acidic

4. The law that the properties of the elements are periodic functions of their atomic numbers.Also called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.

5. Group : VIIA Block : p - block. Period : 3

6. Sodium sulphate is a neutral salt because it is made from the strong acid and strong base. Sodium carbonate is a basic salt because it is made from a strong base and a weak acid.