1. IVA
2. VA
3. VIA
4. VIIA
VIIA
1. II group
2. IV group
3. VIII group
4. zero group
IV group
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 correct explanation of (A)
3. (A) is true, but (R) is false
4. (A) is not true, but (R) is true
(A) is true, but (R) is false
1. HPO32- , PO33-
2. H2PO-4 ,HPO42-
3. H2PO-4 , H3PO4
4. H2PO-4 , PO33-
H<sub>2</sub>PO<sup>-</sup>4 , PO<sub>3</sub><sup>3-</sup>
1. —NH2 and —OR
2. OH and —COR
3. —NH2 and —COOH
4. —OH and —COOR
—OH and —COOR
1. CH3CH(OH)2
2. CH2Cl2
3. CCl3CHO
4. CCl3COCH3
CCl<sub>3</sub>CHO
1. 2
2. 3
3. 4
4. 1
4
1. H-H > C-H > C-C
2. C-C > C-H > H-H
3. C-H > C-C > H-H
4. C-C > H-H > C-H
H-H > C-H > C-C
1. 3:4
2. 1:2
3. 1:4
4. 1:1
1:1
1. Silicon doped with boron is an n-type semiconductor
2. Silicon doped with arsenic is a p-type semiconductor
3. Metals are good conductors of electricity
4. Electrical conductivity of semiconductors decreases with increasing temperature
Metals are good conductors of electricity