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A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be : ($g = 10 \text{ m/s}^2$)
A reaction among the following can generate isonitriles as a major product. (A) $\text{R-X} + \text{HCN} \rightarrow$ (B) $\text{R-X} + \text{AgCN} \rightarrow$ (C) $\text{R-X} + \text{KCN} \rightarrow$ (D) $\text{R-X} + \text{NaCN} \xrightarrow{\text{C}_2\text{H}_5\text{OH}/\text{H}_2\text{O}}$ Choose the most appropriate answer from the options given below:
Phenanthrene is an aromatic compound and follows Hückel's $(4n+2)\pi$ electron rule. The value of $n$ is:
A solution containing $10 \text{ g/dm}^3$ of urea (molecular mass $= 60 \text{ g mol}^{-1}$) is isotonic with a $5 \%$ solution of a non-volatile solute. The molecular mass of this non-volatile solute is:
The manganate and permanganate ions are tetrahedral, due to:
The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is:
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
The correct structure of tribromooctaoxide is
Which colligative property provides the most accurate method for determining the molecular weight of proteins and polymers?
The shorter and longer arms of a submetacentric chromosome are referred to as
The vapour pressure of a solvent decreased by 10 mm of Hg when a non-volatile solute was added to the solvent. The mole fraction of the solute in solution is 0.2. What would be the mole fraction of the solvent if the decrease in vapour pressure is 20 mm of Hg?
The incorrect statement among the following is:
The most reactive compound among the following for electrophilic aromatic substitution is:
Which hormone is responsible for fruit ripening?
What is the correct order of boiling points for the following compounds, arranged from the highest to the lowest? (a) Heptane (b) Butane (c) 2-Methylbutane (d) 2-Methylpropane (e) Hexane
Which one is not equal to zero for an ideal solution?
The freezing point depression constant ($K_f$) of benzene is $5.12 \text{ K kg mol}^{-1}$. The freezing point depression for the solution of molality $0.078 \text{ m}$ containing a non-electrolyte solute in benzene is:
The products that formed when the following compound is treated with $\text{Br}_2$ in the presence of $\text{FeBr}_3$ are:
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Which of the following compounds has the lowest melting point?