Uses of Alkali Metals

Match List - I with List - II.

Choose the correct answer from the options given below:

List the uses of sodium metal.

List the uses of lithium metal.

The following metal ion activates many enzymes, participates in the oxidation of glucose to produce $\mathrm{ATP}$ and with $\mathrm{Na}$, is responsible for the transmission of nerve signals.

Name the following: Ions having high concentration in cell sap.

Directions: Each of these questions contains an Assertion followed by reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.

Assertion: Caesium is used in photoelectric cells.

Reason: Caesium is the most electropositive element.

Chemical $\left(\mathrm{X}\right)$ is used for:
$\left(\mathrm{i}\right)$ The production of sodium hydroxide,
$\left(\mathrm{ii}\right)$ The manufacture of bleaching powder,
$\left(\mathrm{iii}\right)$ For the extraction of magnesium from sea water.

What is the chemical formula of $\left(\mathrm{X}\right)$?

${\mathrm{KO}}_2$ (potassium superoxide ) is used in oxygen cylinders in space and submarines because it

An alloy of $\mathrm{Na}$ and $\mathrm{K}$ is:

Explain the significance of sodium, potassium, magnesium and calcium in biological fluids.

Which of the following metals is most commonly used in photochemical cells?

The function of "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?