engineering recuitment BPSC Assistant Sanitary & Waste Management Officer Mock Test 2022 General Science Chemistry Basic Concepts of Chemistry

जब बेकिंग पाउडर को गर्म किया जाता है या पानी में मिलाया जाता है तो _______ बनता है।

1
H2
2
O2
3
CO2
4
CO
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