The radiant energy from the sun is due to :
combustion
chemical reaction
nuclear fusion
nuclear fission
The two isomers given below are :
enantiomers
diastereomers
mesomers
position isomers
B.
diastereomers
These are diastereomer .Neither any two diastereomers nor their transition state are mirror image of each other and so will not necessarily have same energies .
Which of the following products are formed when SiCl4 vapour are passed over hot Mg ?
SiCl2 + MgCl2
Si + MgCl2
Mg2Si + MgCl2
MgSiCl6
What is the half-life of 6C14 , if its disintegration constant is 2.31 x 10-4 yr-1 ?
0.3 x 104 yr
0.3 x 103 yr
0.3 x 108 yr
0.3 x 102 yr
Ni/Ni2+ [1.0 M] || Au3+ [1.0 M]/Au (where E° for Ni2+/Ni is -0.25 V E° for Au3+/Au is 0.150 V)
Whar is the emf of the cell ?
+ 0.4 V
- 1.75 V
+ 1.25 V
+ 1.75 V
In acidic medium MnO42- is converted to Mn2+ .The quantity of electricity in faraday required to reduce 0.5 mole of MnO42- to Mn2+ would be :
2.5
1
5
0.5
During electrolysis of water the volume of oxygen liberated is 2.24 dm3 .The volume of hydrogen liberated , under same conditions will be :
2.24 dm3
1.12 dm3
4.48 dm3
0.56 dm3