In preparation of sulphuric acid from sulphur dioxide in lead chamber process. What substance is used as a catalyst?
Manganese dioxide
Vanadium pentoxide
Nitric oxide
Raney nickel
Which halogen has the highest value of negative electron gain enthalpy?
Fluorine
Chlorine
Bromine
Iodine
Freon 12 is manufactured from CCl4 by
Wurtz reaction
Swarts reaction
Fittig reaction
Wurtz-Fittig reaction
In which one of the following compounds of xenon, highest number of lone pair of electrons is present in xenon?
XeF6
XeF4
XeF2
XeOF3
Which one of the following statements is not true in respect of propeties of interhalogen compounds?
They are all covalent compounds
They are volatile solids or liquids except ClF
IF5 has square pyramidal structure
They are all paramagnetic in nature
D.
They are all paramagnetic in nature
Interhalogen compounds are covalent molecules. With the exception of CIF (which is a gas at 298 K), all are volatile solids or liquids. They are diamagnetic in nature. The shape of IF5 is square pyramidal. These compounds are very useful flourinating agents. e.g., ClF3 and BrF3 are used for production of UF6 in the enrichment of 235U.
Which of the following noble gases has the nighest positive electron gain enthalpy value?
Helium
Krypton
Argon
Neon
Oxyacids of phosphorus and the starting materials for their preparation are given below.
Oxyacid | Materials for preparation |
A. H3PO2 | i. Red P + alkali |
B. H3PO3 | ii. P4O10 + H2O |
C. H3PO4 | iii. P2O3 + H2O |
D. H4P2O6 | iv. White P + alkali |
Choose the correct answer from the codes given below
A - iv; B - iii; C - ii; D - i
A - i; B - iii; C - ii; D - iv
A - iv; B - iii; C - i; D - ii
A - ii; B - iii; C - i; D - iv