Considering the following statements; identify the correct statements:
(A) Scandium is regarded as a transition element, but zinc is not.
(B) \(V _2 O _3\) is amphoteric and \(V _2 O _5\) is basic oxide.
(C) The similar radii of Zr and Hf is a consequence of the lanthanoid contraction.
(D) The oxidation state of chromium in chromate and dichromate ion is same.
Choose the correct answer from the options given below:

Which one represents the correct reduction reaction for the \(Cu^{2+}/Cu\) half-cell?

Which of the following reactions show that glucose contains five 'OH' groups?

Calculate the magnetic moment of a divalent ion in aqueous solution if its atomic number is 27.

In which of the following actinoid elements 6d subshell is vacant ?

Answer the question on basis of passage given below :
Adsorption is surface phenomenon and it differs from absorption which occurs throughout the body of the substance which absorbs. In physisorption the attractive forces are mainly van der Waal forces while in chemisorption actual bonding occurs between the particles of adsorbent and adsorbed more easily on the surface of a solid as compared to the gases which are liquified with difficulty. Adsorption increases with the increases in pressure and decreases as temperature is increased.
Which one of the following is wrong about chemisorption?

Monochlorination of toluene in sunlight followed by hydrolysis with aqueous \(NaOH\) yields :

Which of the following does not belong to the first transition series ?

Hind II is a restriction endonuclease which always cuts DNA molecule at a particular point by recognizing:

Which of the following is correct about the Sinking Fund?

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 is true for enzyme catalytic reaction?

If A is a square matrix and I is an identity matrix of same order such that \(A^2=A\), then \((I+A)^3-8 I\) is equal to

Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively, illuminate a metal of work function 0.5 eV. The ratio of the maximum KE of the emitted electrons will be :