Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?

(a)

Mg

(b)

Zn

(c)

Cr

(d)

Co

The basic structural unit of silicates is _______.

(a)

\(\left( SiO_{ 3 } \right) ^{ 2- }\)

(b)

\(\left( SiO_{ 4 } \right) ^{ 2- }\)

(c)

\(\left( Sio \right) ^{ - }\)

(d)

\(\left( SiO_{ 4 } \right) ^{ 4- }\)

The hybridisation and shape of SF₆ is respectively?

(a)

sp³d², square planar

(b)

sp³d², octahedral

(c)

sp³d see-saw

(d)

sp³d, trigonal bipyramindal

Which of the following oxidation states is most common among the lanthanoids?

(a)

+4

(b)

+2

(c)

+5

(d)

+3

A complex has a molecular formula MSO₄Cl.6H₂O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

(a)

[M(H₂O)₄Cl]SO₄.2H₂O

(b)

[M(H₂O)₆]SO₄

(c)

[M(H₂O)₅Cl]SO₄.H₂O

(d)

[M(H₂O)₃Cl]SO₄.3H₂O

In a solid, the cation is missing from the lattice and is found in an interstital position. The defect is ________.

(a)

Metal excess

(b)

p type

(c)

Schottky

(d)

Frenkel

For a first order reaction A ⟶ B the rate constant is x min⁻¹. If the initial concentration of A is 0.01M, the concentration of A after one hour is given by the expression.

(a)

001. e^−x

(b)

1 x 10^-2(1-e^-60x)

(c)

(1 x 10^-2)e^-60x

(d)

none of these

If the solubility product of lead iodide is 3.2 × 10^-8, its solubility will be _______.

(a)

2 × 10^-3M

(b)

4 × 10^-4M

(c)

1.6 × 10^-5M

(d)

1.8 × 10^-5M

The solution whose pH is maintained constant even upon the addition of small amounts of acid or base is called ________.

(a)

acidic solution

(b)

basic solution

(c)

buffer solution

(d)

true solution

The process in which chemical change occurs on passing electricity is termed as ______.

(a)

neutralisation

(b)

hydrolysis

(c)

electrolysis

(d)

ionisation

Fog is colloidal solution of _______.

(a)

solid in gas

(b)

gas in gas

(c)

liquid in gas

(d)

gas in liquid

Which among the following reagent is not used to differentiate ethanol and phenol?

(a)

neutral FeCl₃

(b)

C₆H₅N₂CI

(c)

NaOH

(d)

anhy ZnCl₂

Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is _______.

(a)

Grignard reagent

(b)

Sn / HCl

(c)

hydrazine in presence of slightly acidic solution

(d)

hydrocyanic acid

Which among the following exists as zwitter ion?

(a)

sulphanilic acid

(b)

salicylic acid

(c)

acetanilide

(d)

all the above

Pick out the odd one.

(a)

Wax

(b)

Starch

(c)

Glucose

(d)

Fructose

Write the two similarities between calcination and roasting.

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

Discuss the oxidising power of fluorine.

Give the geometry and magnetic character of [NiCI₄]^2-

What are point defects?

Why is instantaneous rate preferred over average rate?

The concentration of hydroxide ion in a water sample is found to be 2.5 × 10^-6M. Identify the nature of the solution.

Define conductance. Give its unit

Can we use nucelophiles such as NH₃,CH₃O ^- for the Nucleophilic substitution of alcohols

Explain alkali leaching in the extraction of aluminum.

Complete the following reactions?
i) Cr² + 2e^- ⟶
ii) Mn²⁺ + 2e^- ⟶
iii) Fe²⁺ + 2e^- ⟶
iv) CO²⁺ + 2e^- ⟶

Write the reactions taking place in anode and cathode of a mercury button cell. Give the over all redox reaction of the cell with the emf generation

Describe some feature of catalysis by Zeolites.

Give chemical tests to distinguish between propan-2-ol and 2-methyl-propan-2-ol.

Identify A, B, C and D
\(\text { ethanoic acid } \stackrel{\mathrm{SOCl}_{2}}{\longrightarrow} \mathrm{A} \stackrel{\mathrm{Pd} / \mathrm{BaSO}_{4}}{\longrightarrow} \mathrm{B} \stackrel{\mathrm{NaOH}}{\longrightarrow} \mathrm{C} \stackrel {\longrightarrow}{\triangle} \mathrm{D}\)

How can the following conversion be effected?
i) Nitrobenzene to anisole
ii) Chloro benzene to phenyl hydrazine
iii)  Aniline to benzoic acid
iv) Benzene diazonium chloride to ehtyl benzene.

Amino acids are amphoteric in nature. Explain.

Write a short note on Antioxidants.

1. Justify the following statement.
   "Elements of the first transition series possess many properties different from those of heavier transition elements".

2. Compound (A) of molecular formula C₇H₈ when treated with air in presence of V₂O₅ at 773 K gives a compound (B) of molecular formula C₇H₆O, which has the smell of bitter almonds. Alkaline KMnO₄ oxidised compound (B) to (C) of molecular formula C₇H₆Or Compound (B) on treatment with N₂H₄ and KOH gives back compound (A). Identify (A), (B) & (C) and explain the reactions.

1. What are the general characteristics of solids?

2. The half life of the homogeneous gaseous reaction SO₂Cl₂ → SO₂ + Cl₂ which obeys first order kinetics is 8.0 minutes. How long will it take for the concentration of SO₂Cl₂ to be reduced to 1% of the initial value?

1. Write a note on zeolites.

2. Indicate the types of isomerism exhibited by the following complexes and draw the structures for these isomers.
   (i) K[Cr(H₂O)₂ (C₂O₄)₂]
   (ii) [Co(en)₃]CI₃
   (iii) [Co(NH₃)₅(NO₂)](NO₃)₂
   (iv) [Pt (NH₃)(H₂O)CI₂]

1. Account for the following:
   (i) Reducing character decreases from SO₂ to TeO₂.
   (ii) Xenon forms compounds with fluorine and oxygen only.

2. Explain the electrical property of colloids with a neat diagram. (or) Write a note on Helmholta electrical double layer.

1. Write the expression for the solubility product of Hg₂Cl₂ .

2. 
   Identify A,B,C,D and write the complete equation