NH4COONH2 (s) 2NH3 (g) + CO2 (g) ,if equlibrium pressure is 3 atm for the above reaction .Kp for the reaction is :
4
27
4/27
1/27
A radioactive nucleus will not emit :
alpha and beta rays simultaneously
beta and gamma rays simultaneously
gamma and alpha rays
gamma rays only
If the Vrms is 30 R1/2 at 27oC then calculate the molar mass of gas in kilogram .
1 Kg
2 Kg
0.001 Kg
0.002 Kg
The standard molar heat of formation of ethane ,CO2 and water are respectively - 21.1 , - 94.1 and - 68. 3 kcal .The standard molar heat of combustion of ethane will be :
- 372 kcal
162 kcal
- 240 kcal
183.5 kcal
Which of the following is paramagnetic ?
N2
C2
N2+
O22-
C.
N2+
C2 ➔ the molecular orbital configuration (12) is
➔ C2 = [(1s)2 (1s)2 (2s)2 (2s)2 (2py)2 (2pz)2]
C2 molecule is diamagnetic as it does not contain any unpaired electron
N2 ➔ the molecular orbital configuration (14) is
➔ N2 = [(1s)2 (1s)2 (2s)2 (2s)2 (2py)2 (2pz)2 (2px)2]
N2 molecule is diamagnetic because it does not contain any unpaired electron .
N2+ ➔ the molecular orbital configuration (13) is
➔ N2+ = [(1s)2 (1s)2 (2s)2 (2s)2 (2py)2 (2pz)2 (2px)1]
N2+ molecule is paramagnetic because it contain one unpaired electron .
O22- ➔ the molecular orbital configuration (18) is
➔ O22- = [(1s)2 (1s)2 (2s)2 (2s)2 (2px)2 (2py)2 (2pz)2 (2py)2 (2pz)2]
It does not contain any unpaired electron so , it is diamagnetic .