Which two transition metal ions has same \(3d\) electronic configuration?
A. \(Mn^{3+}\)
B. \(Fe^{2+}\)
C. \(Mn^{2+}\)
D. \(Fe^{3+}\)
E. \(Cr^{3+}\)
Choose the correct answer from the options given below :

Answer the question on the basis of passage given below :
A colloid is a heterogeneous system in which a substance is dispersed (dispersed phase) as fine particles in another substance called dispersion medium.
Their particle size is intermediate between that of pure solutions (less than 1 nm) and suspensions (greater than 1000 nm).
They are known for interesting properties such as enormous surface area, Tyndall effect, Brownian motion etc.
They are widely used in industries and day to day life.
Some prominent uses of colloids are those in smoke precipitators, purification of water, medicines, cleansers etc.
Which of the following statements correctly explains the charge on hydrated ferric oxide sol, prepared by adding \(\text{FeCl}_3\) to hot water?

Read the passage carefully and answer the questions
The speed at which a chemical reaction takes place is called the rate of reaction. The rate of reaction depends on various factors like concentration of the reactants, temperature, etc. The relation between the rate of reaction and the concentration of reacting species is represented by the equation r = k[A]^x[B]^y, where x and y are the order of the reaction with respect to the reactants A and B, respectively. The overall order of the reaction is x + y. The rate of reaction can also be increased by the use of a catalyst which provides an alternate pathway of lower activation energy. It increases the rate of forward and backward reaction to an equal extent. It does not alter the Gibbs energy of the reaction.
The role of a catalyst is to change

Read the passage below and answer the question:
The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed as adsorption. There are two types of adsorption. In physisorption, attractive forces are mainly Van der Waals while in chemical adsorption adsorbate is held with chemical bonds adsorbent. Adsorption increases with increase in pressure and decreases as temperature is increased.
Critical temperature of few gases are given SO2 (630К), СН4 (190K), H₂ (33K). What is the correct order of case of physi-adsorption of these gases?

The correct cell representation for the following reaction is
\(M g ( s )+ 2 \mathrm { Ag } ^ { + } (0.0001 M ) \rightarrow M g ^{ 2 + }(0.130 M )+ 2 A g (s)\)

A small amount of \(CaF_2\) is added in electrolytic reduction of \(Al_2O_3\) in fused cryolite :
A. To decrease the rate of oxidation of carbon at anode
B. To act as catalyst
C. To make fused mixture conducting
D. To lower the fusion temperature of melt
Choose the correct answer from the options given below :

In Henry's law, the partial pressure of gas in the vapor phase is proportional to:

Which one of the following is an incorrect statement about endosperm
production during double fertilization in plants?

Generally, an angiosperm embryo sac at maturity is -

If you place blood cells in a solution containing more than 0.9% (mass/volume) sodium chloride, water will flow out of the cells and they will shrink. Such a solution is called

Arrange the given organs in correct sequence which are involved in life cycle of Plasmodium?
(A) Gut of mosquito
(B) Salivary glands of mosquito
(C) Liver of man
(D) Blood of man
Choose the correct answer from the options given below:

A wire of resistance 4 \( \Omega \) is used to make a coil of radius 7 cm. The wire has a diameter of 1.4 mm and the resistivity of its material is \( \rho = 2 \times 10^{-7} \, \Omega \, m \). The number of turns in the coil will be

Geometry of \(\left[ Ni ( CN )_4\right]^{2-}\) and \(\left[ NiCl _4\right]^{2-}\) are: