Questions

The error lies in the first part of the sentence. After superlative adjectives, majorly two prepositions are used: of and in. We use in with a singular word referring to a place or group. Eg: I am the happiest woman in the world. We use of before plurals, before time periods such as year/month. Eg: Sunday is the best day of the week. Here, in this case, the subject is the 'school', thus, it should be 'in the school'.

Steroid hormones exert their action by entering the nucleus of a cell and initiating or altering the expression of a gene.

Carbon dioxide (CO2) gas dissolved in water can cause water to become acidic.The acidity of water from dissolved CO2 can be reduced by a base such as baking soda (sodium bicarbonate).

Punjab National Bank (PNB's) managing director and chief executive, Sunil Mehta was elected as new chairman of Indian Banks Association (IBA) for year 2018-19. Bank of India's managing director and chief executive Dina Bandhu Mohapatra was elected as the deputy chairman. Indian Banks' Association, formed on 26 September 1946 as a representative body of management of banking in India operating in India - an association of Indian banks and financial institutions based in Mumbai.