Question # 1

A reaction is reversible because :

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Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

Formalin is:

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

In macromolecules DP stands for

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Dissociation parameter

Dissociation polymer

Degree of polymerization

None of these

The uncertainty principle was stated only

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De Brogilie

Heinsenberg

Einstein

Schrodinger

Tryosine was isolated from

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Butter

Cheese

Oils

Fats

Unsaturated hydrocarbon containing a double bond are called

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paraffin

Alkanes

Olefins

Acetylene

Permonosulphuric acid is known as

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Marshall's acid

Carlo's acid

Sulphuric acid

None of these

In a period, melting points of elements

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Increases

Decreases

Remain constant

First increases then decreases

The compound which gives oxygen on moderate heating is

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Zinc oxide

Mercuric oxide

Aluminium oxide

Ferric oxide

Soft drinks and baby feeding bottles are generally made up of

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Polyester

Polyurethane

Polyurea

Polystyrene

A molecule of haemoglobin is made up if nearly

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10,000 atoms

50,000 atoms

2500 atoms

1500 atoms

In the particular reaction for the valueK_{c 1 x}10^-25which statement is correct :

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Almost forward reaction is completed.

Amount of reactant is negligible as compared to product.

Amount of product is negligible as compared to reactant.

Amount of product is equal to amount of reactant.

In which type of following solutions the total volume of solutions may not be necessarily equal to sum of volumes of solute and solvent ?

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Percentage volume/volume

Percentage volume/weight

Percentage weight/volume

Percentage weight/weight

The valence shell electronic structure of an element is ns²np⁵. The element will along to the group of

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Alkali metals

Inert metals

Noble gases

Halogen

Which of the following process is employed to convert alkyl halide into alcohol?

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Addition

Substitution

Dehydrohalogenation

Molecular rearrangement

Generally ionization energy of atoms decreases by

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Decreases in atomic size

Increase in atomic size

Increase in nuclear charge

None of these

Cathode rays emitted from cathode are

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Canal rays

Protons

Electrons

Positrons

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High temperature and low pressure

Low temperature and high pressure

Low temperature and low pressure

High temperature and high pressure

Weakest acid among the followings is

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Acetic acid

Phenol

Water

Acetylene

Kolb's method is not useful for the production of

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Methane

Ethane

Propane

Butane

Which of the hydrogen halides has the highest percentage of ionic character

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HCl

HBr

HF

HI

The bond angle depends upon the

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Types of bonds

Number of bonds

Non-bonding electron pairs

All of the above

Aldehydes can be distinguished from ketones by

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2,4-DNPH test

NaHSO₃test

N₂H₄test

Tollen's test

Which of the following is acidic?

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SO₃

N₂O

BeO

HgO

When carbon dioxide is passed through the R - Mg - X is produced

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Any carboxylic acid

Propanoic acid

Propanedioic acid

None of these

For spontaneity of a cell, which is correct?

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ΔG = 0,ΔE = 0

ΔG = -ve ,ΔE = 0

ΔG = +ve ,ΔE = 0

ΔG = -ve

The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to

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4-Bromobenzyl cyanide

4-Cyanobenzyl chloride

4-Cyanobenzyle cyanide

4-Bromo 2-cyanobenzyl chloride

Bell metal is an alloy of

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Cu, Zn, and Sn

Cu, Zn and Ni

Cu and Zn

Cu and Sn

Benzene has a -------- structure

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Pentagonal

Hexagonal

Heptagonal

Tetragonal

Reactivity of alkyl halides with magnisium is of the order:

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Rl > RBr> RCl > RF

RBr > RCl >RF > Rl

RCL > RF > Rl > RBr

RF >RI >RBr > RII

The solubility product of Ca(OH)₂is 6.5 x 10^-6. The concentration of OH^-ions is

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1.175 x 10^-2

2.35 x 10^-2

3.25 x 10^-3

3.25 x 10^-4

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