What will come in place of the question mark (?) in the

The Second National Commission on labour suggested that the selection of a registered trade union as a recognised union should be based on: 

Consider the following statements:

Which one of the following will not be reduced by metallic zine?

Select the correct balanced reaction for CuO + NH₃ → Cu + N₂ + H₂O.

If 1 January 2011 was a Saturday, then what day of the week was 31 December 2011?

Which Judicial Plan of Lord Cornwallis established a Court of Circuit?

The country India shares longest international boundary with

 Which area does China claim as its “Sacred territory’’ ?

Consider the following statements:

1. Gram sabha is a village assembly comprising all citizens in the area of panchayat.