Question # 1

The main source of natural fibre is

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Animal fibres

Vegetables fibres

Mineral fibres

All of the above

In the modern periodic table the elements are placed in the ascending order of their

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Atomic masses

Melting points

Boiling points

Atomic numbers

C₆H₁₂O₆ is molecualr formula of:

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Glucose

Dextrose

Fructose

All of these

How many monochlorobutanes will be possible on chlorination of n-butane?

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1

2

3

5

When rate of forward reaction is equal to rate of backward reaction, then the equilibrium established is called

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Chemical equilibrium

Static equilibrium

Dynamic equilibrium

None of these

Which one is primary alcohol?

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Buten-2-ol

Propan-2-ol

Butaon-1-ol

2,3-Dimethylhexane-4-ol

Which of the following compounds does not react with NaHSO₃?

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C₆H₅CHO

Acetophenone

Acetone

Acetaldehyde

The best buffer is prepared when molar concentrations of the salt and acid are equal, then its pH and pKa value are related

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pH = pKa

pH < pKa

pH > pKa

pH x pKa = 14

Carboxylic acids are more acidic than pehnol and alcohol because of

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Intermolecular hydrogen bonding

Formation of dimmers

Highly acidic hydrogen

Resonance stabilization of their conjugate base

A homogeneous mixture of two or more than two chemical substances is called

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Solute

Solution

Solvent

Salvation

Monosaccharides are

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Aldoses

Ketoses

Either a and b

None of these

The boiling point of an a zeotropic mixture of water and ethye alcohol is less than that of water and alcohol. The mixture shows

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That solution is highly saturated

No deviation from Raoult's law

Positive deviation from Raoult's law

Negative deviation from Raoult's law

The addition of HBr is easiest with

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CH2 = CHCl

CICH = CHCl

CH3 - CH = CH2

(CH3)2 C = CH2

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+712 KJ mol^-1

+492 KJ mol^-1

-932 KJ mol^-1

-960 KJ mol^-1

95% ethanol is called:

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Rectified other

Diesel

Rectified spirit

Petrol

On adding sodium nitroprusside ketones give

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Red

Wine red

White

Orange

The acid present in vinegar is

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CH₃COOH

HCI

H₂SO₄

HCOOH

The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule

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Hund's rule

Markowvikov's rule

Pauli's exclusion principle

Auf ban principle

Spraying of DDT produces pollution of

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Air

Air and water

Air and soil

Air, water and soil

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate

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Which of the following has highest first ionization potential?

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Carbon

Oxygen

Nitrogen

Boron

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2-bromo-3-methylbutane

3-methyl-2-bromobutane

2-methyl-3-bromobutane

All of these

Selection of filter paper depends upon sizes of particles to be:

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Tested

^Filtered

Checked

All of above

Among the elements given below, the one with highest electropositivity is

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Cu

Cs

Cr

Ba

The quantum number which describe the orientation of the orbitals is

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Spin quantum number

Principle quantum number

Azimathal quantum number

Magnetic quantum number

A cell constant is generally found by measuring the conductivity of aqueous solution of

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BaCl₂

KCl

NaCl

MgCl₂

Non-formation of menisus by Hg in presence of O₃is due to the formation of

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Mercuric oxide

Mercurous oxide

Mercuric chloride

Mercurous chloride

Which of the following does not turn Schiff's reagent to pink?

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Formaldehyde

Bezaldehyde

Aceton

Methyl chloride

Phosphine is not obtained by the reaction when

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White P is heated with NaOH

Red P is heated with NaOH

Ca₂P₂reacts with water

PH₄l is boiled with water

If ionic product of a solution is greater than solubility product, the solution is

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Supersaturated

Saturated

Unsaturated

None of these

Which one of the following elements occurs free in nature?

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N

P

As

Sb

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