Select the correct statements from the following:
(A) Mn show the highest oxidation state in first transition series elements.
(B) Titanium (II) is more stable than titanium (III) and titanium (IV).
(C) Scandium does not exhibit variable oxidation states.
(D) Zn form complexes with only (II) oxidation state.
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The pair in which both the species have the same magnetic moment (spin only value) is :

Reaction of nitrous acid with aliphatic primary amine in cold gives.

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Alcohols are versatile compounds as they can act as both nucleophile and electrophile. They undergo reactions based on cleavage of O-H and C-O bonds. The cleavage of O-H bond reflects the acidic character of alcohols. However they are weaker acids than water, phenol and carboxylic acids. Alkoxide ion formed by loss of proton from the OH group of alcohols reacts with water to form the corresponding conjugate acid - base pair. They act as Bronsted base due to presence of unshared electron pairs on oxygen.Both alcohols and phenol react with carboxylic acids, acid chlorides and anhydrides to form esters. The introduction of acetyl group in alcohols or phenol is known as acetylation. Alcohols react with hydrogen halides to form alkyl halides which form the basis of Lucas test. They also undergo acid catalyzed dehydration to form alkenes. Alcohols can be easily oxidized with variety of oxidizing agents. The nature of the product depends on the type of oxidizing agent and the nature of alcohol.
Pyridinium chlorochromate is used for:

The values of van't Hoff factors for \(\text{CaCl}_2\), \(\text{Na}_2\text{SO}_4\) and \(\text{KCl}\) respectively are:

Which of the following compounds will give a pair of enantiomers upon nucleophilic substitution reaction with a hydroxide ion?

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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 correct regarding the adsorption of a gas on the surface of solid ?
(A) On increasing temperature, adsorption increases continuously.
(B) Enthalphy and entropy changes are negative.
(C) Chemical adsorption is more specific than physical adsorption.
(D) High temperature favours physical adsorption.
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The integral \(\int \log x d x\) is equal to to:

Which of the following process is used in the extractive metallurgy of magnesium?

In a cyclotron, if a deutron can gain a maximum energy of 40 MeV, then a proton can gain a maximum energy of _________

The electrochemical cells \(Zn \left| Zn ^{2+} \| Cu ^{2+}\right| Cu\) and \(Fe ^{-} Fe ^{2+} \| Cu ^{2+} \mid Cu\) are connected in series. What will be the net emf of the cell at \(25^{\circ} C\) ? Given: \(E ^{\circ}\) of \(Zn ^{2+} \mid Zn =-0.76 V ; \quad E ^{\circ}\) of \(Cu ^{2+} \mid Cu =+0.34 V ; \quad E ^{\circ}\) of \(Fe ^{2+} \mid Fe =-0.41 V\)

Which of the following is only composed of exons?

Which of the following statements is not applicable to chemisorption?
(A) It is independent of temperature
(B) It is highly specific
(C) It is slow
(D) It is irreversible
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