Which of the following statement is correct with respect to the property of elements with increase in atomic number in carbon family.

(1) Their metallic character decreases

(2) The stability of +2 oxidation state increases

(3) Their ionisation energy increases

(4) Their atomic size decreases

 

The graph of first ionization enthalpy versus atomic number as follows:

Which of the following statement is correct?

(1) Alkali metals are at the maxima and noble gases at the minima.

(2) Noble gases are at the maxima and alkali metals at the minima.

(3) Transition element are at the maxima.

(4) Minima and Maxima do not show any regular behaviour.

The electronic configuration of chalcogens in their outermost orbit is:

1. ns²,np³   
2. ns²,np⁴   
3. ns²,np⁵         
4. ns²,np²

Match list-I with list II and select the correct answer using codes given below:

1. List-I Ions                                List-II Radius (in pm)

(I) Li⁺                                         (a) 216

(II) Na⁺                                      (b) 195

(III) Br^-                                      (c) 60

(IV) I^-                                        (d) 95

     Codes:

      I   II   III   IV

1.   a   b    d    c

2.   b   c    a    d

3.   c   d    b    a

4.   d   c    b    a 

Increasing order of the ionic radii and decreasing order of protons of the given isoelectric species is:-

(1) Ca⁺², K⁺, Cl^-, S^-2

(2)Cl^-, Ca⁺², K⁺, S^-2

(3)S^-2, Cl^-, Ca⁺², K⁺,

(4)None of the above

Allred Rochow scale is related to :-

(1) Electronegativity, radius and Z^*

(2) Resonance energy of molecule, Ionisation potential and electron affinity

(3) Bond Polarity, diagonal relationship and periodicity

(4) None of the above

Atomic radius of Be, O, C, N, B are respectively (in pm) :-

(1) 111, 66, 77, 74, 88

(2) 74, 84, 111, 77, 66

(3) 111, 88, 77, 74, 66

(4) 111, 66, 88, 77, 74

Which of the following orders of ionic radii is correctly represented?

(1) H^->H>H+

(2) Na⁺>F^->O^2-

(3) F^->O^2->Na⁺

(4) Al³⁺>Mg²⁺>N^3-

Identify the wrong statement in the following:

(1) Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius

(2) Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

(3) Atomic radius of the elements increases as one moves down the first group of the Periodic Table

(4) Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the Periodic Table

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?

(a) Cl<F<O<S                   (b) O<S<F<Cl

(c) F<S<O<Cl                   (d) S<O<Cl<F