Assertion (A): | Line emission spectra are useful in the study of electronic structure. |
Reason (R): | Each element has a unique line emission spectrum. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Assertion (A): | Emitted radiation will fall in the visible range when an electron jumps from n=4 to n=2 in H-atom. |
Reason (R): | Balmer series radiations belong to the visible range for hydrogen atoms only. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | Half-filled and fully-filled degenerate orbitals are more stable. |
Reason (R): | Extra stability is due to the symmetrical distribution of electrons and high exchange energy. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | The ground state configuration of Cr is 3d54s1. |
Reason (R): | A set of half-filled orbitals containing one electron each with their spin parallel provides extra stability. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | \(ns^2\). | Helium and berylium having the similar outer electronic configuration of type
Reason (R): | Both are chemically inert. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Assertion (A): | Electrons are ejected from a certain metal when either blue or violet light strikes the metal surface. However, only violet light causes electron ejection from a second metal. |
Reason (R): | The electrons in the first metal require less energy for ejection. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Hydrogen atom has only one electron in its orbit. But it produces several spectral lines. |
Reason (R): | There are many excited energy levels available. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | In the Balmer series of the hydrogen spectrum, the transitions occur from an initial energy level ( \(n_1\)= 2 ) to successive higher energy levels \(n_2\)= 3, 4, 5,... . |
Reason (R): | In the Balmer series of the hydrogen spectrum, the transitions with the highest wavelength correspond to energy level values of n equal to 4 and 6. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |