Question # 1

If one mole of carbon contains x atoms what is the number of atoms contained in 12 g of Mg.

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1.5 x

0.5 x

x

2x

Example of heterogeneious mixture is

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Soil

Gasoline

AIR

Ice Cream

The new substance formed in a chemcial reaction is.

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Reverse

Reactant

Forward

Product

Which halogen memebr exists in a liquid stte at room temperature

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Bromine

Chlorine

Fluroine

Iodine

Which of the following does not happpen, when a system is at equilibrium state.

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Reaction continues to occur in both the directions

Concentration of reactants and products stop changig

Forward and reverse reactions stop

Forward and reverse rates become equal

Electron affinity of fluorine in kJmol-1 is

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-328

328

-330

-340

Which is deal with compositon, structure, properties, behavior and changes of matter and energy.

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Technology

Chemistry

Engineering

Science

The compund formed by oppoite charges are known as.

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Metallic solids

Ionic compounds

Non-polar Covalent compound

None of the above

All the noble gases have their valence electrons.

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Incomplete

Partialy filled

Completely filled

None of the above

Number of neurtons in ²⁷M₁₃are

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13

14

27

15

Which types of attractive forces are presentin ionic compounds.

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Covalent bonds

Electrostatic forces of attraction

Mtallic bonds

Coordinate covalent bonds

The region of ozone decomposition in stratosphere is.

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20 km

30 km

40 km

50 km

Which diseases cause by the deficiency of vitamin E?

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Rickets

Anemia in babies

Scurvy

Night blindness

Lipids are macromolecules. They have characteristics except one of the following.

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They are high energy foods.

They are soluble in water.

They are poor conductor of heat.

They are esters of fatty acids.

The percentage of potable water on earth is.

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2%

0.2%

0.02%

0.002%

Froth flotation process is used to concentrate the ore on:

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Density basis

Concentration basis

Wetting basis

Magnetic basis

Phenolphthalein produces red colour in

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Acid

Base

Both a and b

None of these

Which pollutant is not found in car exhaust gases?

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CO

O₃

NO₂

SO₃

When NaHCO₃ is heated it forms.

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CO₂

Ca(OH)₂

CaCO₃

CaO

How many % age of nitrogen in urea fertilizers?

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40.6

45.6

46.6

50

Which contains sufficient amount of metal?

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Mineral

Ores

Rocks

Soil

The process which convert vegetable oil into banaspati ghee called.

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Hydrogenation

Halogenation

a and b

None of these

The highest temperature above which a gas cannot be liquified, no matter how much the pressure is applied is known as

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Boiling temperature

Consulate temperature

Absolute zero

Critical temperature

Photosynthesis a photochemical reaction has order of reaction

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0

1

2

Fractional order

Percentage ionic character of HF is.

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100%

80%

43%

57%

At which distance a molecule is present from its neighbor molecules of its own diameter, at room temperature.

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100 times

200 times

300 times

400 times

Which one of the following orbital will be filled first.

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4f

5d

3d

4s

Acetone and chloroform are soluble in each other due to

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Intermolecualr hydrogen bonding

Dipole-dipole interaction

Instantaneous dipoles

All of the above

Energy and wavelength of a photon are related as.

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Direct

In direct

No correlation

Inverse under root

Which of the following has coordinate covalent bond.

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NH4

NaCl

HCl

AlCl3

Molarity of pure water is

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1

18

55.5

6

Which bond has more ionic characters in it.

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C - F

N - F

O - F

F - F

One of the following substances does not undergo sublimation

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KMnO₄

Naphthalene

NH₄CI

Iodine

The total number of translation elements is

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10

14

40

65

Which one of the following is inorganic fertilizer.

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Manure

Urea

Ammonium nitrate

All of these

In primary alkyl halides, the halogen atom is attached to a carbon which is further attached to how many carbon atoms

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Two

Three

One

Four

Which one of the following compounds is the isomer of ethyl alcohol.

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CH3OH

CH4OCH3

CH5-CH(OH)CH3

CH3OC2H5

Acetylene reacts with ammoniacal cuprous chloride a red ppt is formed. This red ppt is of

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Copper chlorite

Coper chlorate

Cupric oxide

Copper acetylide

Which substance is used for silvering of mirror.

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Acetaldehyde

Ethanol

Ethylene glycol

Acetone

------------------- is not a nucleophile

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H₂O

NO₃

BF₃

NH₃

Chemical composition of colemanite is

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Ca₂B₆O₁₁. 5H₂O

CaB₄O₇. 4H₂O

Na₂B₄O₇.4H₂O

CaNaB₅O₉. 8H₂O

m-choronitro benzene is prepared by

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Nitration of chlorobenzene

Nitration of Benzene

Chlorination of Nitrobenzene

Nitration of m-chlorobenzene

Nelson's cell is used to prepare

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NaOH

Na₂CO₃

Na metal

NaCl

Which one of the following gases is used welding purpose usualy.

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Methane

Ethane

Ethene

Acetylene