Question # 1

An ionic compound M₂S₃is formed by the metal M,, the metal is

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Ca

Ba

K

Al

The reagents like KMnO_{4 and HCL cannot be filtered through Gooch crucible if its base is covered with :}

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Butterfly paper.

Ordinay paper.

Flying paper.

Filter paper.

Which metal is used in the thermit process because of its activity?

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Iron

Copper

Alumnium

Zinc

Silk is an example of

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Animal fiber

Vegetable fibre

Mineral fibre

None of these

At 25°C, the highest osmotic pressure is exhibited by 0.1 M solution of

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CaCl₂

KCl

Glucose

Urea

I-Phenylethanol can be prepared by reaction of benzaldehyde with

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Methyl iodide an Magnesium

Methyl bromide

Methyl bromide and AIBr₃

C₂H₅l and Mg

The difference of potential of two electrodes when concentration of solution is 1M each at 25°C and1 atm is called :

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Cell reaction.

Electrode potential.

Cell voltage.

Standard cell potential.

In Antarctica ozone depletion is due to the formation of following compound

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Acrolein

Peroxy acetyl nitrate

SO₂and SO₃

Chlorine nitrate

Which of the following reactions occur at moderate rate :

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Rusting of iron

Chemical weathering of stone work of buildings by acidic gases in atmosphere.

Hydrolysis of an ester

Fermentation of sugars

Cotton is an example of

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Animal fibre

Mineral fibre

Vegetable fibre

Synthetic fibre

Which of the following factors will favour the reverse reaction in a chemical equilibrium?

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Increase in concentration of one of the reactants

Increase in concentration of one of the products

Removal of one of the products regularly

None of these

For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test

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HCHO and CH₃CHO

CH₃CHO and CH₃COCH

CH₃COCH₃and C₆H₅COCH₃

CH₃COOH and CH₃COOCH₃

Acidification of the soils due to addition of synthetic nitrogen fertilizer, is corrected by using

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Gypsum

Sodium nitrate

Limestone

Potassium nitrate

The value of SHE is cathode and anode is always taken to be

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One

Zero

Different

Same

A single benzene ring can have ______ ortho position maximally

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One

Two

Three

Four

The oxidation number of free element is always taken to be

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0

1

2

-1

Which of the following has highest bond order

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[Co(NH₃)₆]³⁺will form ______ structure

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Square planar

Tetrahedral

Octahedral

Trigonal bipyamidal

K_spvalue for PbSO₄= 1.8 x 10^-8mole²dm^-6. The maximum concentration of Pb⁺⁺ions is

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1.34 x 10^-4mole dm^-3

1.8 x 10^-4

3.6 x 10^-16mole dm^-3

1.0 x 10^-8mole dm^-3

Kolb's method has limited synthetic applications due to

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Expensive catalysis

Slow reaction

Number of side products produced

Salts used are very expensive

What happens when CCl₄is treated with AgNO₃solution?

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NO₂will be evolved

A white ppt. of AgCl will form

CCl₄will dissolve in AgNO₃solution

Nothing will happen

When the 6d orbital is completed the entering electron goes into

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7f

7 s

7 p

7 d

There are 20α-amino acids found in protein 19 have -- NH₂as the amino group. Only one of theα-amino acids has a secondary amino group which one is this

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Glycine

Lysine

Proline

Cystein

The nitration of benzene takes place when it is heated with a mixture of conc.HNO₃and conc. H₂SO₄at 50°C in ratio of

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1 : 2

1 : 1

1 : 3

2 : 1

What is formed when oxalic acid is dehydrated by conc. H₂SO₄?

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C + CO₂

CO

CO₂

CO + CO₂

Density of aluminium is (g cm^-3):

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B

Al

Si

Ge

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

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Chlorination, nitration, reducing

Nitration, chlorination, reducition

Nitration, reduction,chlorination

Nitration, reduction, acylation, chlorination, hydrolysis

Chemical composition of colemnite is:

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Ca₂B₆O₁₁.5H₂O

CaB₄O₇ .4 H₂O

Na₂B₇O₇. 4 H₂O

CaNaB₅O₉.8H₂O

Which of the following synthetic fertilizer do not make soil acidic

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Urea

Thin urea

Ammonium phosphate

Potassium nitrate

The wave number of light emitted by a certain source is 2 x 10⁵m. The wavelength of this light will be:

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500 NM.

500 M.

200 NM.

5 x 10⁷m

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

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The radiations emitted in emission spectrum are absorbed in absorption spectrum

Atomic emission spectrum is continuous

Atomic absorption spectrum is continuous

Distance between the lines increases

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