Which of the following produces hydrolith with dihydrogen?

Which of the following components of cement is present in the highest amount?

Which are the important ingredients present in Portland cement?

Chemical $A$ is used for water softening to remove temporary hardness. $A$ reacts with $Na_2CO_3$ to generate caustic soda. When $CO_2$ is bubbled through $A$,it turns cloudy. What is the chemical formula of $A$?

The outer electronic configuration of alkaline earth metals is:

In India,at the occasion of marriages,the fireworks used give a green flame. Which one of the following radicals may be present?