Name the process by which elements such as germanium, silicon and gallium are refined.

(a)

Vapour phase method

(b)

Electrolytic refining

(c)

Zone refining

(d)

Van-Arkel method

The geometry at which carbon atom in diamond are bonded to each other is _______.

(a)

Tetrahedral

(b)

hexagonal

(c)

Octahedral

(d)

none of these

Pick the wrong one among the following

(a)

F₂ - Yellow

(b)

Br₂ - Red

(c)

Cl₂ - Colourless

(d)

I₂- Violet

Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.

(a)

Ti

(b)

Cu

(c)

Mn

(d)

Zn

Which one of the following will give a pair of enantiomorphs?

(a)

[Cr(NH₃)₆][Co(CN)₆]

(b)

[Co(en)₂Cl₂]Cl

(c)

[Pt(NH₃)₄][PtCl₄]

(d)

[Co(NH₃)₄Cl₂]NO₂

Schottky defects contains _______.

(a)

Cation vacancies only

(b)

Cation vacancies and interstitial cations

(c)

Equal number of cation and anion vacancies

(d)

Anion vacancies and interstitial anions

In a homogeneous reaction A⟶B+C+D, the initial pressure was P₀ and after time t it was P expression for rate constant in terms of P₀, P and t will be _____.

(a)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { 2{ P }_{ 0 } }{ { 3P }_{ 0 }-P } \right) \)

(b)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { { 2P }_{ 0 } }{ { P }_{ 0 }-P } \right) \)

(c)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { 3{ P }_{ 0 }-P }{ 2P_{ 0 } } \right) \)

(d)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { 2{ P }_{ 0 } }{ { 3P }_{ 0 }-2P } \right) \)

Which of the following can act as Lowery – Bronsted acid well as base?

(a)

HCl

(b)

SO₄²⁻

(c)

HPO₄²⁻

(d)

Br^-

The conjugate base of HCIO is ________.

(a)

ClO^-

(b)

Cl^-

(c)

H₂ClO⁺

(d)

CIO

1 mho is equal to ______.

(a)

1 siemen

(b)

1 second

(c)

1 ohm

(d)

none of the above

Which one of the following characteristics are associated with adsorption?

(a)

\(\Delta\)G and \(\Delta\)H are negative but \(\Delta\)S is positive

(b)

\(\Delta\)G and \(\Delta\)S are negative but \(\Delta\)H is positive

(c)

\(\Delta\)G is negative but \(\Delta\)H and \(\Delta\)S are positive

(d)

\(\Delta\)G, \(\Delta\)H and \(\Delta\)S all are negative.

1-Propanol and 2- propanol can be best distinguished by ______.

(a)

oxidation with KMnO₄ followed by reaction with Fehling solution

(b)

oxidation with acidic dichromate followed by reaction with Fehling solution

(c)

oxidation by heating with copper followed by reaction with Fehling solution

(d)

oxidation with concentrated H₂SO₄ followed by reaction with Pehling solution

The formation of cyanohydrin from acetone is an example of _______.

(a)

nucleophilic substitution

(b)

electrophilic substitution

(c)

electrophilic addition

(d)

Nucleophilic addition

CH₃NO₂+6[H] \(\underrightarrow { X? } \) CH₃NH₂+2H₂O. 'X' is

(a)

Sn/HCI

(b)

Zn/NH₄CI

(c)

Glucose + NaOH

(d)

Na₃A₅O₃/NaOH

Carbohydrates are

(a)

polyhydroxy aldehydes

(b)

polyhydroxy ketones

(c)

polyhydroxy acids

(d)

both (a) and (b)

Discuss the process of roasting with suitable example.

What is catenation ? describe briefly the catenation property of carbon.

Although \(\triangle\)H of fluorine is less negative than that of chlorine, but fluorine is a stronger oxidising agent than chlorine, why?

Define coordination number.

What are point defects?

The decomposition reaction of ammonia gas on platinum surface has a rate constant R = 2.5 x 10^-4mol L^-1. What is the order of the reaction.

Define solubility product.

What is a electro chemical cell?

Suggest a suitable reagent to prepare secondary alcohol with identical group using Grignard reagent.

What is coupling of reaction? How is it useful in metallurgy?

Explain the oxidising property of KMnO₄ in alkaline medium.

Write the electrochemical cell for the overall cell reaction.
Zn_(S)+2AgNO₃ ⟶ 2Ag_(S) +Zn(NO₃)₂

What happens when a colloidal sol of Fe(OH)₃ and As₂S₃ are mixed?

Halo alkane are easily prepared from alcohols while alkyl halides cannot be prepared from phenol. Justify.

What is the action of HCN on
(i) propanone
(ii) 2,4-dichlorobenzaldehyde
iii) ethanal

An organic compound 'A' on reduction gives compound 'B' which on reaction with trichloromethane and caustic potash forms 'C'. Compound 'C' on catalytic reduction given N-methyl benzenamine. Identify A, B and C and write the reactions involved.

Name two water soluble vitamins, their sources, function and diseases caused due to their deficiency in diet.

Write the preparation of neoprene and give its use.

1. Write a note on zeolites.

2. Explain the structure of inter halogen compounds

1. Why is there a variation of atomic and ionic size as we move from Sc to Zn?

2. What is meant by stability of a co-ordination compound in solution? State the factors which govern stability of complexes.

1. Write note on impurity defect?

2. The rate constant for a first order reaction is 1.54 x 10^-3 s^-1. Calculate its half life time.

1. Solubility product of Ag₂CrO₄ is \(1\times10^{-12}\). What is the solubility of Ag₂CrO₄ in 0.01M AgNO₃ solution?

2. Write a note on phase transfer catalysis.

1. Phenol is distilled with Zn dust followed by friedel – crafts alkylation with prophyl chloride to give a compound B, B on oxidation gives (c) Indentify A,B and C.

2. An organic compound (A) with molecular formula C₃H₆O undergoes iodoform reaction. Two molecules of compound (A) react with dry HCI to give compound (B) (C₆H₁₀O). Compound (B) reacts with one more molecule of compound (A) to give compound (C) (C₉H₁₄O). Identify (A), (B) and (C). Explain the reactions.