IIT-JEE-Chemistry-Final Revision Set No.45

1. In the dichromate dianion :
(A) 4 Cr—O bonds are equivalent
(B) 6 Cr—O bonds are equivalent
(C) all Cr—O bonds are equivalent
(D) all Cr—O bonds are nonequivalent
2. The oxidation number of sulphur in S8, S2F2, H2S respectively, are :
(A) 0, +1 and –2 (B) +2, +1 and –2
(C) 0, +1 and +2 (D) –2, +1 and –2

3. In the commercial electrochemical process for aluminium extraction, the electrolyte used is :
(A) Al(OH)3 in NaOH solution
(B) an aqueous solution of Al2(SO4)3
(C) a molten mixture of Al2O3 and Na3AlF6
(D) a molten mixture of AlO(OH) and Al(OH)3

4. On heating ammonium dichromate, the gas evolved is:
(A) oxygen (B) ammonia
(C) nitrous oxide (D) nitrogen

5. The geometry of H2S and its dipole moment are :
(A) angular and non-zero (B) angular and zero
(C) linear and non-zero (D) linear and zero

Source: 1999 JEE

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