Which one of the following statements is incorrect with regard to ortho and para dihydrogen? (1) They are nuclear spin isomers. (2) The ortho isomer has zero nucolear spin whereas the para isomer has one nuclear spin. (3) The para isomer is favoured at low temperatures. (4) The thermal conductivity of the para isomer is 50% greater than that of the ortho isomer. (5) It is never possible to obtain 100% pure ortho isomer.

Which one of the following statements is incorrect with regard to orth

1.	Which one of the following statements is incorrect with regard to ortho and para dihydrogen? (1) They are nuclear spin isomers. (2) The ortho isomer has zero nucolear spin whereas the para isomer has one nuclear spin. (3) The para isomer is favoured at low temperatures. (4) The thermal conductivity of the para isomer is 50% greater than that of the ortho isomer. (5) It is never possible to obtain 100% pure ortho isomer.
Answer» Solution :On the basis of spinning of protons, HYDROGEN has two allotropes, called ortho hydrogen and para hydrogen. In ortho hydrogen, SPINS of protons are in same DIRECTION, so the NUCLEAR spin `=1/2+1/2=1`. While in para hydrogen, Spins of protons are in opposite direction, so the nuclear spin = `=1/2+(-1/2)=0`