MCQ
For a first $-$ order reaction, the concentration of reactant:
- AIs independent of time
- BVaries linearly with time
- ✓Varies exponentially with time
- DNone
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$(A)$ $\left[ Ni \left( H _{2} O \right)_{2}( en )_{2}\right]^{2+}$
$(B)$ $\left[ Ni \left( H _{2} O \right)_{4}(\text { en })\right]^{2+}$ and
$(C)$ $\left[ Ni ( en )_{3}\right]^{2+}$ is ...... .