engineering recuitment BARC Stipendiary Trainee Category II 2023 Mock Test General Science Chemistry Equilibrium

The aqua regia is:

1
3HCl (conc.) + 1 HNO3 (conc.) 
2
3NHO3 (conc.) + 1 HCl (conc.)
3
HNO3 (conc.) + H2SO4 (conc.)
4
HHO3 (conc.) + HCl (conc.)
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