91.

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

Which one of the following group 16 elements does not exist in -2 oxidation state?

• S

• Se

• O

• Po

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 has the maximum number of P-OH bonds?

• H₃PO₂

• H₃PO₄

• H₄P₂O₆

• H₄P₂O₅

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

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.

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

Which halide of magnesium has highest ionic character?

• Chloride

• Bromide

• Iodide

• Fluoride