Which colour is developed to the solution when alkaline earth metals are dissolved in liquid ammonia?

Which of the following house hold plastic material is used to prepare drinking straws?

What is the time required for $99 \%$ completion of a first order reaction if rate constant is $23.03 \mathrm{~min}^{-1}$ ?

Identify the product formed in the following reaction. $\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2-\mathrm{CH}_3 \xrightarrow[\text { ii) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {i) alk. } \mathrm{KMnO}_4}$ Product