Identify the correct decreasing order of stability of complexes formed by divalent metal ions with same ligand.
$\mathrm{Co}^{2+}>\mathrm{Fe}^{2+}>\mathrm{Ni}^{2+}$
$\mathrm{Fe}^{2+}>\mathrm{Co}^{2+}>\mathrm{Ni}^{2+}$
$\mathrm{Ni}^{2+}>\mathrm{Co}^{2+}>\mathrm{Fe}^{2+}$
$\mathrm{Ni}^{2+}>\mathrm{Fe}^{2+}>\mathrm{Co}^{2+}$
Which from following tests for glucose confirms presence of carbonyl group?
Action of $\mathrm{NH}_2 \mathrm{OH}$ to form oxime
Heating with HI forming $n$-hexane
Formation of pentaacetate derivative when reacted with acetic anhydride
Glucose and gluconic acid both form saccharic acid when treated with dilute $\mathrm{HNO}_3$
Half life of a first order reaction is 3 hours. Calculate the value of $\frac{[\mathrm{A}]_0}{[\mathrm{~A}]_{\mathrm{t}}}$ after 8 hours.
2.17
4.34
6.34
8.12
What is the average oxidation number of carbon in carbon suboxide $\mathrm{C}_3 \mathrm{O}_2$ ?
0
$+\frac{1}{3}$
$+\frac{4}{3}$
+2
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