Question # 1

A sub sheel that cna accommodate 6 electrons is

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b

s

f

p

Acids means

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Bitter

Salty

Sweet

Sour

Stochiometric calculators are used to prepare.

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Soaps

Shampo

Perfumes

All of these

17th Group of elements contain electrons in their outer most shell

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4

5

7

6

Which group of the periodic table has the tendency to gain electrons.

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Group -1

Group -17

Group-2

Group -18

While baking which gas is responsible for raising the bread and making it soft?

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Oxygen

Carbon monoxide

Carbon di oxide

Nitrogen

When we mvoe top to bottom in group, ionization energy.

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Increases

No effet

Decreases

None of these

Which of the following is Bronsted base?

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HCl

CH3COOH

H2O

NH3

How doe electrons keep themselves away from the oppositely charged nucleus.

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A agnetic field around the nucleus keeps them away

By keeping themselves stationary

By revolving around the nucleus

Due to their wave like nature

When we mvoe from top to bottom in a group atomic size.

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Decrease

Increases

First increases then decreases

None of the above

The reaction in which the products do not reombine to form reatants are called

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Addition reactions

Decomposition reactions

Irreversitble reactions

reversible reactions

Ammonia is prepared by the process .

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Ostwald

Haber

Clark

All

The depletion of which gas results in the death of aquatic life.

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Oxygen

Carbon di oxide

Boath of them

Nome of them

Which is a hereditary material?

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DNA

RNA

Protein

All of them

The two major components of atmosphere are:

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Hydrogen and oxygen

Nitrogen and Hydrogen

Nitrogen and oxygen

Oxygen and water.

PAN stands for

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Poly aniline nitrate

Proxy acetyl nitrate

Poly acetyl nitrite

Proxy acetyl nitrite

Which of one of the following is used as as fumigant:

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Ethyl alcohol

ethylene oxide

ethylene glycol

diethyl ether

Pitch is black residue of

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Coke

Coal-tar

Coal

Coal gas

Which one Ion is not present in salt.

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Metallic cation

Anion of Base

Anion of acid

None metallic anion

Which one of the following is not air pollutants?

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N₂

CO

NO₂

O₂

Concentration of copper are is carried out by process.

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Roasting

Forth floatation

Gravity sepration

Electrostatic separation

Which one of the following diseases causes liver inflammation?

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Typhoid

Jaundice

Cholera

Hapatitis

Isotopes differ in

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Properties which depend upon mass

Arrangement of electrons in orbital

Chemical properties which depend upon weight

Atomic number

Standard enthalpy change when one mole of compound is formed from their elements at standard state is.

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Heat of formation

Standard heat of formation

Heat of combustion

Standard Heat of neutralization

One of the following substances is not used as a drying reagent in a desiccator

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Cons. H₂SO₄

P₂O₅

Silica gel

50% KOH

Fluorine molecule (F₂) is formed by the overlap of

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s - s orbital

s - p orbital

p - p head on overlapping of orbitals

p - p parallel overlapping of orbitals

18 g glucose is dissolved in 90 g of water. The relative lowering of vapour pressure is equal to.

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1/5

5.1

1/51

6

The e/m value for the positive rays in maximum for the gas.

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Helium

Oxygen

Nitrogen

Hydrogen

The smallest collection of ions in an ionic compound is called.

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Formula unit

Chemical formula

Formula mass

Molecular formula

Two solution of NaCI and KCI are prepared separately by dissolving same moles of them in the fixed amount of solvent. Which of the following statements is true for these solution

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KCI solution will have higher boiling point than NaCI solution

Both the solutions have different boiling point

KCI and NaCI solution possess same vapour pressure

KCI solution possesses lower freezing point than NaCI solution

Which one of the following molecule have angle of 120 ^o

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Be Cl2

BF3

CH4

NH3

One molecule of hemoglobin in heavier than one atom of hydrogen.

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680 times

6800 times

68000 times

680000 times

Which molecules is 100% covalent

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H2

H2O

HF

NH3

Which are correct oxidation states for lead

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+1, +2

+3 , +5

+2 ,+4

+4 only

Which statement is incorrect.

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All the metals are good conductors of electricity

All the metals are good conductor of heat

All the metal form positive ions

All the metal form acidic oxides

NH4NO3 on heating at 200 ^oC changes to

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N2O

NO

NO2

N2O4

Phenol when distilled with zinc dust gives.

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Toluene

Benzaldehyde

Benzoic acid

Benzene

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

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KOH

NaOH

CaO and NaOH

Ca(OH)2

Some non protein portion attached to the protein is called.

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Prosthetic group

Secondary protein

Transport protein

All of these

Geometrical isomerism in alkene is due to.

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C = C free rotation of bond

No C = C free rotation of bond

Presence of multiple bond only

Opticla rotation due to multiple bond

Which electronic configuration corresponds to an element of group III-A of the Periodic Table

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1s²,2s²,2p⁶,3s²,3p¹

1s²,2s²,2p⁶,3s²,3p⁶,4s⁶

1s²,2s²,2p⁶

1s²,2s²,3s²,3p³

Which is most difficult to be oxidized

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CH₃CHO

CH₃COCH₃

HCHO

C₂H₅CHO

The word paper is derived from the name of which reedy plant

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Rose

Sun flower

Papyrus

Water

The avoid the formation of toxic compounds with chlorine which substance is used for disinfecting water

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KMnO₄

O₃

Alums

Chloramines