railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry

નીચેનામાંથી કયા તત્વોના સમૂહની સંયોજકતા સમાન છે?

1
Na, Mg, Ca
2
Na, Mg, Al
3
Mg, Ca, K
4
Mg, Ca, Ba
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