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Q73) The final acid obtained during the manufacture of H2SO4, by contact process is [ SCRA 1991]




SOLUTION

In contact process SO3 is dissolved in H2SO4
Answer: (d)


Q74) Acidified solutions of sodium thiosulphate are unstable because in thiosulphate .. [ AIIMS 1994]




SOLUTION

Thiosulphate ion (S2O32-) contains two sulphur atoms in different oxidation state of +6 and -2 and is highly unstable in presence of acidic medium. Na2S2O3 +2Hcl → 2NaCl + SO2 + S + H2O
Answer: (b)


Q75) Sulphuric acid reacts with Pcl5 to give .. [ Haryana CEET 1996]



SOLUTION

2PCl5 + H2SO4 → POCl3 + HCl + SO2Cl2 9sulphuryl chloride)
Answer:(c)



Q76) Which of the following does not show hydrogen bonding? [ AIIMS 1998]



SOLUTION

Electro negativity of S is very low thus does not show hydrogen bonding
Answer: (a)


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