$A$ certain metal is used in the preparation of an antacid. This metal accidentally catches fire,which cannot be extinguished using $CO_2$. Which metal is this?

Which of the following metals,upon burning in moist air,does not produce the smell of ammonia?

Identify the correct statements about alkali metals.
$A$. The order of standard reduction potential $(M^{+} \mid M)$ for alkali metal ions is $Na > Rb > Li$.
$B$. $CsI$ is highly soluble in water.
$C$. Lithium carbonate is highly stable to heat.
$D$. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.
$E$. All the alkali metal hydrides are ionic solids.
Choose the correct answer from the options given below.

Assertion : Magnesium continues to burn in nitric oxide.
Reason : During burning heat evolved does not decompose $NO$.

The reaction of water with sodium and potassium is

$A$ metal when left exposed to the atmosphere for some time becomes coated with green basic carbonate. The metal in question is