Question # 1

Which one of the following metals burns with a brick red flame?

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Sodium

Magnesium

Iron

Calcium

________________ observed that formation of covalent bonds.

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Rutherford

G.N Lewis

Both a and b

Bohar's

The 2nd and third periods are called

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short period

Normal period

Long period

Very long period

Amadeo Avogadro was a _______________ scientist.

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Italian

English

Greek

Russian

Which of the following is less malleable?

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Sodium

Iron

Gold

Sliver

Which one is largest?

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Exo

Peta

Atto

Pico

The mixture of two component is called .

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Homogeneous mixture

Binary solution

Both a & b

Nil

Which one is a solution?

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Carbonated drinks

Sugar

Benzene

Vineger

The practical unit of concentration is

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%v/v

%v/m

%m/m

M

The vapour pressure of a liquid increase with the:

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increase pressure

increase of temperature

increase of intermolecular forces

increase of polarity of molecules

A solution whose molarity is known is called:

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Dilute solution

Concentrated solution

Saturated solution

Molar solution

Mesosphere has a temperature range.

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17 ^oC - 58^oC

58^oC - 2^oC

2^oC - 93^oC

- 93^oC

Which diseases cause by the deficiency of vitamin E?

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Rickets

Anemia in babies

Scurvy

Night blindness

Which is disaccharide?

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Glucose

Fructose

Sucrose

Starch

Ozone is beneficial for us as it

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Absorb infrared radiation.

Absorb Ultraviolet radiations.

Absorb Chlorofluorocarbons

Absorb Air pollulant

The organic compound used as drugs to control bleeding are.

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Vitamins

Proteins

Lipids

Glycerides

Basic solution have pH value.

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Less than 7

Greater than 7

equal to 7

None of these

Main component of natural gas is

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Methane

Propane

Butane

Propene

The number of carbon atoms present in petroleum gas.

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1-2

1-3

1-4

1-5

Example of pest is

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Weeds

Herbs

Insect

All of them

At equilibrium state, when reaction cases to proceed, it is called:

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equilibrium constant

dynamic equilibrium

static equilibrium

simple equilibrium

Which of the following statement s is not true about fossil fuels?

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they all contain carbon

They are renewable

they produce pollutants when burnt

they cause acid rain

Which of the following substances is used as decolorizing agent.

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Silica gel

Animal charcoal

conc. H2SO4

Asbestos

A filtration process could be very time consuming if it were not aided by a gentle suction, which is developed

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If the paper covers the funnel up to its circumference

If the paper has got small sized pores in it

If the stem of the funnel is large so that it dips into the filtrate

If the paper fits tightly

In which compound oxidation state of chlorine is +5

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NaCl

HOCl

NaClO3

NaClO2

In order to have good crystals of a substance the temperature of the system at the time of preparation of solution should be

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Around 0°C

Around room temperature

Sufficiently more than room temperature

Just above the room temperature

What happens to the enthalpy change when the coeffficients of a chemical equation are douubled

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It doubles

It becomes half

It does not change

It cannot be predicted

Which of the following has linear structure.

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CO2

NH3

CH4

H2O

The molecules of CO2 i dry ice form the.

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Ionic crystals

Molecular crystals

Amorphous

Covalent crystals

Which gas has highest e/m ratio

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Hydrogen

Helium

Nitrogen

Oxygen

Which statement is incorrect about order of reaction

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It cannot be determined experimentally

It is determined experimentally

Sum of exponents in rate equation

It can have fraction value

Stronger the oxidizing agent greater is the

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Oxidation potential

Reduction potential

Redox potential

E.M.F of cell

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1The wave length of this light is.

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500 nm

500 m

200 nm

600 m

Ionization energy of calcium is.

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Lower than that of barium

Lower than that of magnesium

Higher than that of beryllium

Lower than that of strontium

Formula of chloroform is

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CH₃Cl

CCl₄

CH₂Cl₂

CHCl₃

Which one is basic amino acid

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Lysine

Alanine

Glycine

Aspartic acid

Which one of halogens is a liquid

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F₂

Cl₂

Br₂

I₂

Which compound is more soluble of water

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C2H5OH

C6H5OH

CH3OCH3

n- Hexanol

The oxides of metal sare generally

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Acidic

Basic

Neutral

Amphoteric

To prevent corrosion, Iron pipes carrying drinking water are covered with zinc by

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alley formation

Electroplating

Galvanizing

Soldering

Venyl acetylene combines with HCl in

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Polyacetylene

Benzene

Chloroprene

divinyl acetylene

The pH range of the acid rain is.

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7-6.5

6.5-6

6-6.5

Less than 5

Ethyne on oxidation with strong alkaline KMnO4 changes to

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Ethyl alcohol

Acetaldehyde

Vinyl alcohol

Glyoxal

The solution of which acid is used for seasoning of food.

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Formic acid

Acetic acid

Benzoic acid

Butanoic acid