Question # 1

First energy level is denoted by:

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K

L

M

N

Electron ________________ energy when they jump from low to higher level.

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Absorb

Radiate

Nothing

Nil

_________ can be separated by physical means.

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Mixture

Compound

Solution

Nil

Which one of the following solution contains more water?

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2M

IM

0.5M

0.25M

Which one of the following is the lightest metal?

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Calcium

Magnesium

Lithium

Sodium

Hydrogen has ________________ isotopes.

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1

2

3

4

One amu (atomic mass unit) is equivalent to:

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1.66x10^-24 mg

1.66x 10^-24g

1.66x10 g

1.66x10^-23mg

............. are sonorous.

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Metals

Solids

Metals

Force

The lowest energy level is

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K

L

M

N

It is a strong electrolyte

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H2O

CH3COOH

NaOH

C6H6

Which shows Tyndall Effect?

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Slution

Colloid

Suspension

True solution

Building block of lipids are.

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Fatty acids

Carboxylic acids

Mineral acids

Alcohols

The major constituents of troposphere are:

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carbon dioxide and argon

nitrogen and oxygen

argon and oxygen

carbon dioxide and oxygen

Clark's method is used to remove the hardness of water, in this method which is used.

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Ca(HCO₃)₂

Na-Zeolite

Ca-Zeolite

Ca(OH)₂

At dynamic equilibrium:

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The reactions stops to proceed

The amounts of reactants and products are equal

The speed of the forward is reverse reactions are equal

The reaction can no longer be reversed

Which is used to manufacture of soap?

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NaOH

Ca(OH)₂

KOH

Mg(OH)₂

Water become hard because of:

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Ca+2

Mg+2

SO-24

all of these

The chemical used in Clark's method is:

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CaO

slaked lime(Ca(OH)s)

washing soda

sodium zeolite

Which acid used for food preservation?

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H₂SO₄

HNO₃

HCl

CH₃COOH

A conjugate base is a specie formed by donating a.

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Proton

Electron pair

Neutron

Electron

Which disease causes bone and tooth damage?

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Fluorosis

Hepatits

Cholera

Jaundice

Compound of metal exist under earth crust are called.

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Ore

Gangue

Minral

None of these

The total number of protons and neutrons present in the nucleus of an atom is called.

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Mass number

Atomic number

Molecular mass

Relative atomic mass

Which is not chargeable cell

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Lead accumulator

NiCAD cell

Fuel cell

Alkaline battery

The molecule of CO2 in dry ice form the.

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Ionic crystals

Covalent crystals

Molecular crystals

Any type of crystals

Which of the following precautions in necessary for smooth filtration

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The filter paper should be of big size

The tip of funnel should not touch the side of the beaker

The stem of the funnel should be very small

The stem of he funnel should remain continuously full of liquid

An aqueous solution of ethanol is water has vaporu pressure.

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Equal to the of water

Equal to that of ethanol

More than that of H2O

Less than that of water

The molal boiling point constant is the the ratio of the elevation in boiling point to.

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Molarity

Molality

Mole fraction of solvent

Mole fraction of solute

Both CH4 and NH3 are four electron pair system the angles of CH4 and NH3 are 109.5^o and 107.5 ^o respectively. This deviation is due to.

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Hydrogen bonding in ammonia

Lone pair attraction

Lone pair occupy more space and repel to other bond pairs

Lone pair lone pair repulsion

Along period of periodic table shielding effects.

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Increases

Decreases

Remain constant

First increases than decreases

How many moles of CO are present having 12.04 x 10²³molecules of CO2.

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0.5 mol

1.0 mol

1,5 mol

2.0 mol

A real gas obeying Van der Waal's equation will resemble ideal gas if.

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Both a and b are large

Both a and b are small or zero

A is small and b is large

A is large and b is small

The over all positive value for the reaction potential predicts that process is energetically.

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Not feasible

Feasible

Impossible

No indication

Bakelite is obtained from phenol by reacting with

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Acetal

Ethanal

Formaldehyde

Methanol

A single chloride free radical can destroy how many ozone molecules

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100

100,000

100,00

unlimited

An ester can be prepared by the reaction of.

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Two alcohols

Alcohol and an aldehyde

An alcohol and an organic acid

an acid and a ketone

During Nitration of Benzene the active nitrating agent is

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NO₃

NO₂⁺

NO₂

HNO₃

An aldehyde is reduced to alkane with hydrazine is the presence of

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KOH

NaOH

CaO and NaOH

Ca(OH)2

In Down's cell anode is made up of.

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Iron

Copper

Graphite

Platinum

Mark the correct statement.

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Na+ is smaller than Na atom

Na+ is large than Na atom

Cl- is smaller than Cl atom

cl- and Cl are equal in size

Group VI-B of transition elements contains

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Zn, Cd, Hg

Fe, Ru, Os

Cr, Mo, W

Mn, Te, Re

Which of the following compounds will not give iodoform test on treatment with I2/NaOH

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Acetaldehyde

Acetone

Butanone

3-Pentaneone

The brown gas formed, when metal reduce HNO₃

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NO

NO₂

N₂O₃

N₂O₅

The presence of a double bond in a compound is the sign of

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Saturation

Un-saturation

Substitution

None of these