MCQ
After a chemical reaction, the total mass of reactants and products
- AIs always increased
- BIs always decreased
- ✓Is not changed
- DIs always less or more
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Product $(A)$ is
$(I)\, CO_3^{-2}$ $(II)\,XeF_4$
$ (III)\,I_3^- $ $(IV)\,NCl_3$
$(V)\,BeCl_2$