defence exam Agniveer Army Tradesman Mock Test Series 2025 General Science Chemistry Equilibrium

निम्नलिखित में से कौन सा युग्म लुईस अम्ल है?

1
NH4+, BCl3
2
BCl3, FeCl3
3
AlCl3, H2CO3
4
HCl, HNO3
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