Given below are two statements:
Assertion (A): | Boron has a smaller first ionisation enthalpy than beryllium. |
Reason (R): | The penetration of 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded by the inner core of electrons than the 2s electrons. |
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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (A): | Generally, ionisation enthalpy increases from left to right in a period. |
Reason (R): | When successive electrons are added to the orbitals in the same principal quantum level, the shielding effect of inner core of electrons does not increase very much to compensate for the increased attraction of the electron to the nucleus. |
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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCorrect statement(s) among the following are:
(a) | Helium has the highest first ionisation enthalpy in the periodic table. |
(b) | Chlorine has less negative electron gain enthalpy than fluorine. |
(c) | Mercury and bromine are liquids at room temperature. |
(d) | In any period, the atomic radius of alkali metal is the highest. |
Choose the correct option:
1. (a), (c), (d)
2. (a), (b), (c)
3. (a), (c)
4. (a), (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe correct order of ionization energy of W, X, Y and Z is-
1. | W > X > Y > Z | 2. | W < X < Y > Z |
3. | W < X > Y< Z | 4. | W > X > Y< Z |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the following graph of variation of ionization energy with atomic number, X, Y, and Z represent elements.
The group number of X, Y, and Z elements is:
1. | 1st group | 2. | 15th group |
3. | 17th group | 4. | 18th group |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe graph between ionization energy and atomic number for
the first group elements is shown below:
The element represented by Y in the graph above is -
1. Cs
2. Rb
3. Ca
4. K
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAbnormally high ionization enthalpy of B as depicted in the graph below can be due to :
1. Completely filled 2p subshell.
2. Completely filled 2s subshell.
3. Completely filled 3d subshell.
4. Completely filled 4f subshell.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe correct graph depicting ionization energies for 2nd period elements is:
1. | |
2. | |
3. | |
4. | None of the above |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (A): | The first ionization energy of aluminum is lower than that of magnesium. |
Reason (R): | The ionic radius of aluminium is smaller than that of magnesium. |
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) and (R) both are False. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology