Lack of Vitamin B1 causes:

The vapour pressure of pure benzene is } \(0.900\) bar. If a non-volatile electrolytic solid is added, the vapour pressure of the solution becomes \(0.200\) bar. If the number of moles of solute and solvent in the solution are \(1\) and \(2\) respectively, what is the value of van't Hoff factor (i)?

Which one of the following ligands forms a chelate?

The products for the reaction of KMNO₄ with potassium iodide in acidic solutions are

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The transition metals and their compounds are known for their catalytic activity. This activity is ascribed to their ability to adopt multiple oxidation states and to form complexes. Vanadium(V) oxide (in Contact Process), finely divided iron, and nickel (in Catalytic Hydrogenation) are some of the examples. Catalysts at a solid surface involve the formation of bonds between reactant molecules and atoms of the surface of the catalyst (first row transition metals utilise 3d and 4s electrons for bonding). This has the effect of increasing the concentration of the reactants at the catalyst surface and also weakening of the bonds in the reacting molecules (the activation energy is lowering). Also because the transition metal ions can change their oxidation states, they become more effective as catalysts.
\(TiCl_4 + Al(CH_3)_3\) is used as a catalyst in:

A solution of \(\text{AgSO}_4\) is electrolysed for 30 minutes with a current of 5 amperes. What is the mass of silver deposited? (Given At. Mass of Ag = 108 g/mol)

The reagent used to convert propanol to 1-bromopropane is:

The value of \(\tan \left\{2 \tan ^{-1}\left(\frac{1}{5}\right)+\pi / 4\right\}\) is :

The properties which depend on the number of solute particles irrespective of their nature relative to the total number of particles in the solution are called colligative properties. These are relative lowering of vapour pressure of the solvent, depression of freeaing point of the solvent, elevation of boiling point of the solvent and osmotic pressure of the solution. All of these properties help in calculating the observed molar mass of the solute.
Determination of osmotic pressure is considered best for the determination of molecular mass of the solute.
Which ssolution has the highest boiling point ?

What is the de-Broglie wavelength associated with an electron, accelerated through a potential difference of 10 kV

The forbidden energy gap for Si is

\( \alpha, \beta \) and \( \gamma \) rays emitted by a radioactive substance are allowed to pass through a region containing a magnetic field at right angles to their path. The energy gained will be

Arrange the following alcohols in decreasing order of acidity :

Choose the correct answer from the options given below :