The First ionisation enthalpies of Na,Mg,Al and Si are in the order
1. Na<Mg>Al<Si
2. Na>Mg>Al>Si
3. Na<Mg<Al<Si
4. Na>Mg>Al<Si
The electronic configuration of chalcogens in their outermost shell is :
1.
2.
3.
4.
Among the following species, the smallest ion is :
1. | Na+ | 2. | F- |
3. | O2- | 4. | N3- |
The correct order for electron affinity of halogens is :
1. Br > F
2. F > Cl
3. Br > Cl
4. F > I
Which one of the elements has the highest ionization energy?
1. [Ne]3s23p1
2. [Ne]3s23p2
3. [Ne]3s23p3
4. [Ar]3d104s24p2
Element/Ion that has the highest electron affinity is :
1. | F- | 2. | O- |
3. | O | 4. | Na |
The correct order of second ionisation energies of B, C, N, & O is
1. O > N > C > B
2. O > C > N > B
3. O > B > C > N
4. O > N >B > C
An atom of the element A has 3 electrons in its outermost shell while another atom X has 6 electrons in its outermost shell. The formula of the compound between A and X could be.
1. A2X3
2. AX3
3. A3X2
4. A2X
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
The screening effect of d-electrons is :
1. Equal of the p-electrons
2. Much more than p-electrons
3. Same as f-electron
4. Less than p-electrons