ASSERTION AND REASON QUESTIONS ON P-BLOCK ELEMENTS
ASSERTION AND REASON QUESTIONS ON P-BLOCK ELEMENTS
1.. Assertion : The ionization energy of Pb is greater than the ionization energy of Sn.
Reason : The size of Pb is greater than that of Sn.
(a) A (b) B (c) C (d) D
1. (b)
2. Assertion : I2 + I– ¾® I3-
In the above reaction I2 is functioning as a Lewis base.
Reason : Electron pair donor is a Lewis base.
(a) A (b) B (c) C (d) D
2. (d)
3. Assertion : N2 and NO+ both are diamagnetic substances.
Reason : NO+ is isoelectronic with N2.
(a) A (b) B (c) C (d) D
3. (a)
4. Assertion : (CH3)3N is a stronger base than (SiH3)3N.
Reason : There is pp-dp bonding in (SiH3)3N while such bonding does not exist in (CH3)3N.
(a) A (b) B (c) C (d) D
4. (a)
5. Assertion : Sulphur
Reason : Both are reducing agents.
(a) A (b) B (c) C (d) D
5. (c)
6. Assertion : Enthalpy of formation of graphite is lower than that of diamond.
Reason : Entropy of graphite is greater than that of diamond.
(a) A (b) B (c) C (d) D
6. (b)
7. Assertion : PbCl2 is more stable than PbCl4.
Reason : PbCl4 is powerful oxidizing agent.
(a) A (b) B (c) C (d) D
7. (b)
8. Assertion : The bond angle around PBr3 is larger than that in PH3 but bond angle of NBr3 is less than that of NH3.
Reason : Atomic size of Br is smaller than that of P atom because of larger nuclear charge.
(a) A (b) B (c) C (d) D
8. (c)
9. Assertion : Increasing order of acidic strength is BBr3 < BCl3 < BF3.
Reason : Negative inductive effect increases as Br < Cl < F.
(a) A (b) B (c) C (d) D
9. (d)
No comments:
Post a Comment