Which of the following is not a metal?

(1) Gold

(2) mercury

(3) Scandium

(4) Selenium

The alkali metals have:

1. Highest ionization energy

2. Largest atomic radii

3. Highest density

4. Highest electronegativity

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-