PART - 1 CH - 3 Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

1. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
2. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3. Assertion is true but Reason is false.
4. Both Assertion and Reason are false.

Assertion: Heat capacity is the amount of heat required to raise the temperature of a body by 1K.
Reason: Heat capacity is an extensive property and It depends upon the size of the body.

Calculate the hydrogen ion concentration in the following biological fluids whose pH are given below:
Human saliva, 6.4.

What is the difference between a quantum and a photon?

What are Isoelectronic species?

Why is it more logical to call the atomic radius as the effective atomic radius?

Which of the following statements related to the modern periodic table is incorrect?

1. The p-block has 6 columns, because a maximum of 6 electrons can occupy all the orbitals in a p-subshell.
2. The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.
3. Each block contains a number of columns equal to the number of electrons that can occupy that subshell.
4. The block indicates value of azimuthal quantum number for the last subshell that received electrons in building up the electronic configuration.