The ratio of angular speeds of the minute hand and the hour hand of a watch is

Which among the following is a dicarboxylic acid?

Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at $T \ K$ are $50 \ mm \ Hg$ and $40 \ mm \ Hg$ respectively. What is the mole fraction of toluene in vapour phase when $117 \ g$ of benzene is mixed with $46 \ g$ of toluene? (molar mass of benzene and toluene are $78 \ g \ mol^{-1}$ and $92 \ g \ mol^{-1}$ respectively)

$A$ block of weight $W$ is held against a vertical wall by applying a horizontal force $F$. The minimum value of $F$ needed to hold the block is

The cubic unit cell of a metal (molar mass $= 63.55 \ g \ mol^{-1}$) has an edge length of $362 \ pm$. Its density is $8.92 \ g \ cm^{-3}$. The type of unit cell is

The number of $5$-digit numbers that are not divisible by $5$ and consist of different odd digits is: