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Q. No.In Mendeleev's periodic table, a number of series and groups are X and Y respectively. X and Y are:
1. X=12, Y=9
2. X=8, Y=9
3. X=8, Y=8
4. X=12, Y=8
Subtopic: Evolution of Periodic Table |
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The pair of elements which is not placed in the same group in Mendeleev's periodic table is:
1. Sc, Ga
2. Mn, Br
3. Nb, Sb
4. Rb, Cd
1. Sc, Ga
2. Mn, Br
3. Nb, Sb
4. Rb, Cd
Subtopic: Evolution of Periodic Table |
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Given below are two statements:
| Statement I: | Dissociation is the process of separation of ions in the water already existing as such in the solid state of the solute like NaCl. |
| Statement II: | Ionization corresponds to a process in which neutral molecules split into charged ions in the solution. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct and Statement II is incorrect. |
| 4. | Statement I is incorrect and Statement II is correct. |
Subtopic: Nature of Compound |
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| The correct electronic configuration of an element that is just above the 4th period and belongs to the 16th group: |
1. 4s23d104p4
2. 2s22p4
3. 3s23p4
4. 5s25d104p4
Subtopic: Electronic Configuration |
62%
From NCERT
JEE
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| Assertion (A) | The helium atom has the highest ionization energy among all the elements. |
| Reason (R): | Helium is the smallest atom among all the elements. |
| 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. |
Subtopic: Ionization Energy (IE) |
51%
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Mark the correct arrangement of the elements B, C, At, and S in order of increasing electronegativity:
1. B > C > S > At
2. S > C > B > At
3. C > B > S > At
4. S > C > At > B
1. B > C > S > At
2. S > C > B > At
3. C > B > S > At
4. S > C > At > B
Subtopic: Electronegativity |
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Which of the following pair is correctly matched?
1. Basic oxides - \(\mathrm{In_2O_3 , K_2O , SnO_2}\)
2. Neutral oxides - \(\mathrm{CO, NO_2, N_2O}\)
3. Acidic oxides - \(\mathrm{Mn_2O_7, SO_2, TeO_3}\)
4. Amphoteric oxides -\(\mathrm{BeO , Ga_2O_3 , GeO }\)
1. Basic oxides - \(\mathrm{In_2O_3 , K_2O , SnO_2}\)
2. Neutral oxides - \(\mathrm{CO, NO_2, N_2O}\)
3. Acidic oxides - \(\mathrm{Mn_2O_7, SO_2, TeO_3}\)
4. Amphoteric oxides -\(\mathrm{BeO , Ga_2O_3 , GeO }\)
Subtopic: Nature of Compound |
From NCERT
NEET - 2023
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
Subtopic: Ionization Energy (IE) |
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Consider the following statements:
Which of the above statements is/are correct?
1. Only I
2. Only II
3. Only I and III
4. Only II and III
| I: | The radius of an anion is larger than that of the parent atom. |
| II: | The electronegativity of any given element is a constant, and it is a measurable quantity. |
| III: | The electronegativity of an element is the tendency of an isolated atom to attract an electron. |
1. Only I
2. Only II
3. Only I and III
4. Only II and III
Subtopic: Electronegativity |
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Valence electrons in the element X are 3 and that in element Y is 6. The most probable compound formed from X and Y is:
1. X2Y
2. XY2
3. X6Y3
4. X2Y3
1. X2Y
2. XY2
3. X6Y3
4. X2Y3
Subtopic: Nature of Compound |
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