Questions

The error is in first part. Replace ‘whom’ with ‘who’. ‘Whom’ is a pronoun which is the objective case of the pronoun ‘who’. But who is the subject in the given sentence, and hence usage of ‘whom’ is incorrect here.

Error is in third part. Every, each, either, neither are adjectives that are always followed by a singular pronoun. Every being singular takes singular subject. Therefore ‘their ideas’ should be replaced with’ his/her idea’.

India    competed    at    the    2016 Summer    Olympics    in    Rio    de Janeiro,   Brazil,   from   5   to   21 August   2016.   The   Indian   roster featured  three  Olympic  medallists from  London,  including  badminton star     Saina     Nehwal,     freestyle wrestler  and  four-time  Olympian Yogeshwar  Dutt,  and  rifle  shooter Gagan   Narang.   Medals   Ranked 67th:  Gold  0,  Silver  1,  Bronze  1, Total  2  Competitors:  117  in  15 sports

A solar eclipse happens when the moon gets in the way of the sun's light and casts its shadow on Earth. Solar eclipses happen when the New Moon comes between the Sun and Earth and blocks out the Sun's rays.