Question # 1

How many elements are present in 1st period.

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1

2

8

18

You are styding the rate of hydrolysis of organic compund staarch under different conditonns of temperature. In which branch of chemistry this topic will fall

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Organic Chemistry

analytical chemistry

Biochemistry

Physical Chemistry

Atomic number of lanthanum is

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57

58

59

60

Period nuebr tells abou the

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No. of valance electrons

No. of electronic shells

Both a and b

None of the above

Following are state of matter.

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Liquid

Solid

Gas

All of these

All transition elements belong to

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s and p block

d- block

f-block

d and f block

Avogadrao was a scientist

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Italian

Greek

Garman

African

Sodium metal has electrons

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10

11

12

14

Keeping in view the intermolecular forces of attraction, indicate which compound has the highest boiling point

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H₂S

HF

NH₃

H₂O

Ionic compund are good conductors electricity in

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Solution

Molten state

Solid state

both a and b

--------------- of the energy used by traditional electric bulb is wasted in producing heat.

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60%

50%

70%

90%

The reaction in which the number of moles reactants and products not equal in balance chemical equation the units of Kc for this reactions are

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mol^-2

dm³

mol²

mol dm^-1

There are ____________ types of salts.

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2

3

6

8

Which one of the following is Lewis base?

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NH₃

BF₃

H⁺

AlCl₃

Swimming pools are cleaned by the process.

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Chlorination

Hydrogenations

Saponification

None of them

One of the hydrocarbons reacts with one mole of hydrogen to form a saturated hydrocarbon. What is the formula could be of the x:

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C₃H₈

C₆H₁₂

C₄H₁₀

C₂H₁₆

Which one of the followoing is the Hardest coal.

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Peat

Lignite

Bituminous

Anthracite

Alkanes are least reactive compounds because they are.

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Saturated hydrocarbons.

Unsaturated hydrocarbons.

Both a and b

None of the above.

Temporary hardness is due to the presence of bicarbonates of.

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Calcium

Magnsium

Both of them

None of them

Indicators are the

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Inorganic compounds

Organic compounds

Ionic compounds

Covalent compounds

A strange bitter smell noticed near photocopiers is of:

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SO2

H2S

O2

O3

A conjugate acid is a specie formed by accepting a.

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Proton

Electron pair

Neutron

Electron

The reduction potential of Zn is.

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+0.76 V

-0.34 B

+0.34 V

-0.76 V

Which of the following compound has the highest % o f oxygen by weight

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CH₃- OH

C₂H₅OH

HCOOH

H₂O

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

The comparative rates at which the solutes move in paper chromatography, depends on

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The size of paper used

Their R_fvalues

Their partition coefficients

The polarity of solvent used

The true representation for the units of rate constant K for the first order reaction

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sec^-1

mole dm^-3s

mole dm^-3s^-1

mole^-1dm⁺³s^-1

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

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1/5

5.1

1/51

6

The best reducing agent is

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F^-1

CI^-1

Br^-1

I^-1

An orbital which is spherical and symmetrical is

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S-Orbital

P - Orbital

d- Orbital

f - Orbital

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dm⁺⁶mole^-2

mole²dm^-6

Mole dm^-3

Having no units

As compared to pure atomic orbitals the hybrid orbitals have.

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Low energy

High energy

Same energy

None of these

NaCI and sand can be separated by one of the following without filtration

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Formation of solution and filtration

Formation of solution and evaporation without filtration

Sublimation

Chromatiograghy

Bleaching powder may be produced by passing chlorine over.

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Calcium carbonate

Hydrated calcium sulphate

Anhydrous calcium sulphate

Calcium hydroxide

Which of these polymers is a synthetic polymer

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Animal fat

Starch

Cellulose

polyester

Amongst the following, the compound of that can be most readily sulphonated is

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Toluene

Benzene

Nitro-benzene

Chloro-benzene

A quality of raw water is improved by

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Reduction

Aeration

Dehydration

Incineration

Wohler synthesized first organic compound in laboratory from

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Heating cyanogen's

Cyanogen and ammonium chloride solution

Cyanogen and HNO2

Heating ammonium cyanate

Which one of the following enzyme is used for the treatment of blood cancer in children.

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Thrombin

Asparaginase

Glucokinase

Fumarase

Common names of aldehydes are derived from the common names of.

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Alcohol

Ketones

Carboxylic acids

Alkenes

------------- does not belong to Alkaline-Earth metals

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Be

Ra

Ba

Rn

How many zones through which the charge passes in a rotary kiln

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4

3

2

5

Which one does not belong to the alkaline earth metals

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Be

Ba

Ra

Rn

Which acid is used in the manufacture of synthetic fibre

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid