Question # 1

The p subshell has:

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one orbital

two orbitals

three orbitals

four orbitals

The forces of attraction present between the molecules of a substance are called ____________ forces.

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Intermolecular forces

Covalent

Ionic

Nil

Which one is not a tetraatomic molecular?

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H2O

H2O2

SO3

BCL3

The isotopes of an element have different number of

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Electrons

Protons

Neutrons

Protons & Neutrons

Pure alkali metals can be cut simply by knife but iron cannot because of alkali metals have:

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Strong metallic bonding.

Weak metallic bonding

Non- metallic bonding

Moderate metallic bonding

Potassium's atomic no. is :

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17

18

19

20

In silver plating Anode is made of:

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Gold

Ag

Neon

Nil

A _________ is a pure substance is made up of two or more elements.

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Mixture

Elements

Solution

Compound

Atoms are arranged in ________________ structure in Bucky balls.

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Hollow

Cage

A & B

Nil

Which is a polar molecule?

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HCI

H₂

CI₂

O₂

_________ elements naturally occurring.

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92

118

93

117

Acute lead poisoning causes dysfunction of.

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Kidney

Liver

CNS

All of them

Dextrose is a crystallized:

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sucrose

lactose

glucose

fructose

Which disease is caused by polluted water.

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Cholera

Typhoid

Diarrhea

All of them

The percentage of water in human body is.

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40%

50%

60%

70%

Carbohydrates are synthesized by plants through photosynthesis process which requires the following except.

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CO₂ and water.

Sunlight

O₂

Chlorophyll

Carbon Tetra chloride is used in .

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Fertilizer

Dry cleaning

Metallurgy

Anesthesia

pH of neutral solution is always.

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6

5

7

10

Lactic acid founds in:

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Citrus fruits

Sour milk

Rancid Butter

Apple

Metallurgy involves which of the following steps?

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Mining and enrichment

Reduction

Refining and casting.

All of these

The % age of carbon is bituminous is

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60

70

80

90

Chemical form of gypsum.

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MgSO₄. 5H₂O

CaSO₄. 2H₂O

FeSO₄. 5H₂O

CuSO₄. 5H₂O

Which has greater enthalpy of vaporization

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F2

Cl2

Br2

I2

Solvent extraction method is particularly useful technique for separation when the product to be speared is.

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Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

A solution has pH zero. Its H+ ions concertation will

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zero

More than unity

Less than unity

Unity only

In which de excitation of electron of hydrogen atom maximum energy is relaeased.

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From n2 to n1

From n3 to n2

From na to n1

From na to n2

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

When HCl is added to H2S aqueous solution, Its ionization

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Decrease

Increase

Remains constant

First increases than decreases

In order to mention the oiling point of water at 110 ^oC, the external pressure should be.

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

The cathodic reaction in the electrolysis of dill. H₂SO₄with Pt electrodes is

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Reduction

Oxidation

Both oxidation and reduction

Neither oxidation nor reduction

BF3 has zero while NH3 has 1.49 D dipole moment because.

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B is less electronegative than N

F is more electronegative than N

BF3 is pyramidal while NH3 is planar

NH3 is pyramidal while BF3 is trigonal planar

The unit of Kc for the reaction N2 +O2 = 2NO will be

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mol dm-3

mol-1 dm+3

mol-2 dm+6

No units

The bond angle in NH3 molecule is

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109.5^o

107.5^o

104.5^o

106^o

Which one of the following is not a nucleophile.

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H2O

H2S

BF3

NH3

Which one of the following does not belong to alkaline earth metals

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Be

Ra

Ba

Rn

Boric acid is used as eye wash due to its

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Weakly acidic property

Antiseptic nature

Antibiotic nature

Weakly basic properties

The reactivity of Grignard's regent is due to

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Polarity of Mg-x bond

Polarity of C-Mg bond

Electro negativity of halogen atom

Presence of Mg-atom

Aluminium does not corrode because.

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It is a semi metal

It is a silver shining metal

It does not react with O2

It forms a protective layer of Al2O3

In which reactions alkane is not produced

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Subatier's and Sendern reaction

Koibe's reaction

Wolf -Kishner's reduction

Dow's process

The anhydride of HCIO4 is

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CIO3

CIO2

Cl2O5

Cl2O7

To product aldehyde group against alkaline oxidizing agent.

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It is reduced in the presence of catalyst

An acetal is formed

It is oxidized

It is treated with aqueous NaBH4

Which ion will have the maximum value of heat of hydration.

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Na+

Ca+

Ba+2

Mg+2

Which one of the following alkanes will be formed by the hydrolysis of ethyl magnesium bromide

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Methane

Ethane

Butane

do not hydrolysed

Which property of triglycerides is used to determine its molecular mass.

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acid number

Saponification number

Iodine number

gold number