railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Chemical Bond and Molecular Structure

নীচের কোনটিতে আয়নীয়, সমন্বয় এবং সমযোজী বন্ধন রয়েছে?

1
NaCN
2
NaCl
3
NaNC
4
NaOH
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