- 1(current)
Q. No.The first ionisation enthalpies of Na, Mg, Al, and Si are in the order of:
1. Na < Al < Mg < Si
2. Na > Mg > Al > Si
3. Na < Mg < Al < Si
4. Na > Mg > Al < Si
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch the correct ionization enthalpies and electron gain enthalpies of the following elements.
|
Elements |
|
|
|
||
|
(i) |
Most reactive non-metal |
A. |
419 |
3051 |
-48 |
|
(ii) |
Most reactive metal |
B. |
1681 |
3374 |
-328 |
|
(iii) |
Least reactive element |
C. |
738 |
1451 |
-40 |
|
(iv) |
Metal forming binary halide |
D. |
2372 |
5251 |
+48 |
Codes
| A | B | C | D | |
| 1. | ii | i | iv | iii |
| 2. | i | ii | iii | iv |
| 3. | i | iv | iii | ii |
| 4. | iv | i | iii | ii |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| Assertion (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 & BiologyGiven 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 & BiologyAmongst the following elements whose electronic configuration are given below, the one having the highest ionisation enthalpy is:
| 1. | 2. | ||
| 3. | 4. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAmongst the following elements whose electronic configuration are given below, the one having the highest ionisation enthalpy is:
1.
2.
3.
4.
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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 & BiologyIn which following options of arrangement does not agree with the variation of the property indicated against it?
| (a) | Al3+< Mg2+< Na+< F– (Increasing ionic size) |
| (b) | B < C < N (Increasing atomic size) |
| (c) | I < Br < Cl (Increasing atomic size) |
| (d) | Li < Na < K (Metallic character) |
Choose the correct option
| 1. | (a), (d) | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (b), (d) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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