The reaction between sodium and water can be made less vigorous by

The element having electronic configuration $[Kr]4d^{10} 4f^{14} 5s^2 5p^6 6s^2$ belongs to

The alkali metals form salt-like hydrides by direct synthesis at elevated temperatures. The thermal stability of these hydrides decreases in which of the following orders?

Which of the following compounds is completely water soluble?

Which of the following elements forms a superoxide when reacted with air?

Select the correct statement from the following.