defence exam SSB Head Constable (Communication) 2023 Mock Test General Science Chemistry Equilibrium

Goldsmiths uses Aqua Regia, which is prepared by mixing

1
Nitric acid and Sulphuric acid
2
Nitric acid and Hydrochloric acid
3
Sulphuric acid and Hydrochloric acid
4
Citric acid and Benzoic acid
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