The largest unit of energy among the following is ...... .

The mass of a coin Manoj has is $4 \ g$ and its volume is $2 \ cm^3$. What will be the density of the substance in $SI$ units?

$22.71 \, L$ of a gas is equal to how many cubic meters $(m^3)$?

Identify the carrier gas commonly used in gas chromatography.

If the value of Avogadro number is $6.023 \times 10^{23} \ mol^{-1}$ and the value of Boltzmann constant is $1.380 \times 10^{-23} \ J \ K^{-1}$,then the number of significant digits in the calculated value of the universal gas constant is

Select the $INCORRECT$ statement/s from the following:
$(a)$ $22$ books have infinite significant figures
$(b)$ In the answer of calculation $2.5 \times 1.25$,the result has four significant figures.
$(c)$ Zeros preceding the first non-zero digit are significant.
$(d)$ In the answer of calculation $12.11 + 18.0 + 1.012$,the result has three significant figures.