Practice free Classification of elements and Periodicity in properties (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Arrange the following elements in increasing order of electronegativity: N, O, F, C, Si
Choose the correct answer from the options given below:
Standard Pauling values: Si 1.9, C 2.55, N 3.04, O 3.44, F 3.98.
Which of the following statements are true?
A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On Pauling scale, the electronegativity values of N and Cl are not the same. C. Ar, K⁺, Cl⁻, Ca²⁺, and S²⁻ are all isoelectronic species. D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si > Al > Mg > Na. E. The atomic radius of Cs is greater than that of Li and Rb.
Choose the correct answer from the options given below:
A is false (Ga has a low melting point). B is false (N and Cl have nearly equal Pauling electronegativity, ≈3.0). C is true (all have 18 electrons). D is false (correct order is Si > Mg > Al > Na). E is true. Hence C and E only.
Which among the following electronic configurations belong to main group elements? A. $[\text{Ne}]3s^1$, B. $[\text{Ar}]3d^3 4s^2$, C. $[\text{Kr}]4d^{10}5s^2 5p^5$, D. $[\text{Ar}]3d^{10}4s^1$, E. $[\text{Rn}]5f^0 6d^2 7s^2$. Choose the correct answer from the option given below:
A ($[\text{Ne}]3s^1$ = Na, s-block) and C ($[\text{Kr}]4d^{10}5s^2 5p^5$ = I, p-block) are main group. B, D are transition (d-block) and E is f-block.
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