Why does colour of \(KMnO_4\) disappear when oxalic acid is added to its solution in acidic medium?

Which of the following postulates of Werner theory is incorrect?

Glycoside linkage is the ether bond present in between two:

The colour of \(\left[ Ni \left( NO _2\right)_6\right]^{4-}\) complex is ______________

Which one is a water-soluble protein?

Write the formula for Tetramminediaquacobalt (III) chloride.

Which of the following reactions are given by Phenols?
(A) Nitration
(B) Halogenation
(C) Oxidation
(D) Acetylation
Choose the correct answer from the options given above:

A metal wire under constant potential difference, when heated, shows that the drift velocity of the electron :

Read the passage carefully and answer the Questions
The concentration dependence of the rate of a reaction is called the differential rate equation. It is not always convenient to determine the instantaneous rate, as it is measured by calculating the slope of the tangent at point 't' in the concentration vs time plot. This makes it difficult to determine the rate and hence the order of the reaction. This difficulty is overcome by integrating the differential rate equation. This integrated rate equation gives a direct relation between concentrations at different times and the rate constant. The integrated rate equations are different for the reactions having different reaction orders.
The rate constant of a reaction is 2.1 mol L-'s-¹. What is the order of the reaction?

Since Physisorption arises mainly because of van der Waals forces, it means adsorption is:
(pick the incorrect option)

Which one of the given species has more numbers than the combined total number of rest of the other given species?

Choose the correct statements:
(A) The angle of incidence corresponding to an angle of refraction \(90^{\circ}\) is called critical angle (i).
(B) Refractive index of denser medium \(\mu=\frac{1}{\sin \left(i_c\right)}\).
(C) For \(i>i_c\), Snell's law of refraction cannot be satisfied.
(D) The refractive index of air increases with decrease in density.
(E) Rainbow is the combined effect of dispersion, refraction and reflection of sunlight by droplets.
Choose the correct answer from the options given below :

An inorganic salt taken in a test tube was mixed with freshly prepared ferrous sulphate solution.
Concentrated sulphuric acid was then added along the walls of the test tube.
Predict the formula of the compound formed :