Transition elements has great variety of oxidation states, Identify elements showing only three oxidation states
A. Ni
B. V
C. Co
D. Ti
E. Fe
Choose the correct answer from the options given below:

The gold number range of some of the lyophilic colloids is given below:
A: 0.005-0.01, B: 0.15-0.25, C: 0.04-1.0, D: 15-25
Which among these can be used as a better protective colloid?

In which of one the following all the concentration terms are independent of temperature?

Match List I with List II

list 1	list 2
A. Vitamin A	1. Rickets
B. Vitamin C	II. Xerophthalmia
C. Vitamin B1	III. Scurvy
D. Vitamin D	IV. Beri-Beri

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Read the passage carefully and answer the Questions
The term vitamin was coined from the word vital +amine since the earlier identified compounds had amino groups.Later work showed that most of them didn't contain amino groups, so the letter "e" was dropped and ther term vitamin is used these days.
Vitamins are classified into two groups depending upon their solubility in water or fat. Fat soluble vitamins are soluble in fat and oils but insoluble in water. They are stored in liver and adipose (fat storing) tissues. Water-soluble vitamins are soluble in water. They must be supplied regularly in the diet as they are readily excreated in urine.
What is Xerophthalmia disease?

Answer the question on the basis of passage given below :
Adsorption is a surface phenomenon and it differs from absorption which occurs throughout the body of the substance that absorbs. In physiosorption the attractive forces are mainly van der Waal's forces while in chemisorption ionic/covalent bonds are formed between particles of adsorbent and adsorbate. The catalytic activity of finely divided iron in Haber's process of ammonia manufacture can be explained by adsorption theory. Adsorption being an exothermic process, the heat of adsorption is utilised in enhancing the rate of the reaction. Adsorption has many applications being used in gas masks, control of humidity, chromatograph separation, curing diseases etc.
Which of the following is not a surface phenomenon?

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 du increased.
Adsorption is spontaneous because:

Match List-I with List-II

List-I (Compound)	List-II (Uses)
(A) Diazonium salt	(I) Surfactants
(B) Novocain	(II) Antihistaminic drug
(C) Benadryl	(III) Dentistry
(D) Quaternary ammonium salts	(IV) Dyes

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The statement that is NOT true about induced emf is :

Which of the following statements about the rate of a chemical reaction are correct?
(A) The rate of reaction is always proportional to the concentration of reactants
(B) An exponential time course is followed by the first order reaction
(C) The unit of rate of reaction in the gaseous state is atm/s
(D) The concentration of reactant decreases exponentially with time for a zero order reaction
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A pair of adjacent coils has a mutual inductance of 2.0 H. If the current in one coil changes from 0 to 25 A in 0.8 s, the change of flux linkage with the other coil is

Match List I with List II

List - I	List - II
(A) \(\int x^2 e^{x^3} d x\)	(I) \(\frac{1}{2 a} \log \left|\frac{a+x}{a-x}\right|+C\)
(B) \(\int e^x\left(\tan ^{-1} x+\frac{1}{1+x^2}\right) d x\)	(II) \(\frac{1}{a} \tan ^{-1}\left(\frac{x}{a}\right)+C\)
(C) \(\int \frac{d x}{a^2-x^2}\)	(III) \(\frac{1}{3} e^{x^3}+C\)
(D) \(\int \frac{d x}{x^2+a^2}\)	(IV) \(e^x \tan ^{-1} x+C\)

If \(A=\left[\begin{array}{ll}1 & 0 \\ 3 & 1\end{array}\right]\) and \(A^4=\left[\begin{array}{ll}1 & 0 \\ k & 1\end{array}\right]\), then the value of \(k\) is :