IISER Exam Model Papers : Chemistry

IISER Exam Model Papers : Chemistry

16. What is the potential of a cell containing two hydrogen electrodes, in which the anode is in contact with 10−5M HCl and the cathode is in contact with 1000 times the concentration of HCl as that of the anode?

A. 0.36 V.
B. 0.18 V.
C. −0.36 V.
D. −0.18 V.

17. Phosphorus pentoxide, P4O10, has each phosphorus linked to:

A. 5 oxygen atoms with P − P bonds.
B. 5 oxygen atoms.
C. 4 oxygen atoms with P − P bonds.
D. 4 oxygen atoms.

18. The radius of an atom of He is 0.05 nm. Assuming that one mole of a gas occupies 22.4 litres at STP, the fraction of the volume occupied by the atoms in a  mole of He gas at STP is:

A. 1.4 × 10−4
B. 1.4 × 10−5
C. 7.1 × 10−4
D. 7.1 × 10−5
19. The number of degenerate orbitals present in an energy level of a H-atom characterized by E = −R/16 where R is the Rydberg constant is:

A. 16.
B. 9.
C. 4.
D. 1.

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