The role of copper diaphragm in Whytlaw-Gray's method is
preventing the corrosion of electrolytic cell
preventing the mixing of H2 and F2
as anode
as cathode
Liquid X is used in bubble chamber to detect neutral mesons and gamma photons. Then, X is
He
Ne
Kr
Xe
Which of the following is not added durig the extraction of silver by cyanide process?
NaCN
Air
Zn
Na2S2O3
Which one of the following gives Prussian blue colour?
Fe2[Fe(CN)6]
Na4[Fe(CN)6]
Fe3[Fe(CN)6]3
Fe4[Fe(CN)6]3
The products formed, in the reaction of phenol with Br2 dissolved in CS2 at 0°C are
o-bromo, m-bromo and p-bromophenols
o-bromo and p-bromophenols
2,4,6-tribromo and 2,3,6-tribromophenols
2,4-dibromo and 2,6-dibromophenols
The structure of PCC is
C6H5HCrO2
C6H5HCrO2
C5H5HCrO2
C5H5HCrO3
D.
C5H5HCrO3
Pyridinium chlorochromate or PCC can be prepared by the dissolution of chromium trioxide in aqueous HCl. Addition of pyridine gives pyridinium chlorochromate as orange cryotol. PCC offers to the advantage of the selective oxidation of alcohols to aldehydes, whereas many other reagents are less selective.
Example of a biodegradable polymer pair is
nylon-6, 6 and terylene
PHBV and dextron
bakelite and PVC
PET and polyethylene
The number of hydrogen bonds between guanine and cytosine and between adenine and thymine in DNA is
1, 2
3, 2
3, 1
2, 1