CHEMISTRY - 02 (LEE EDUTEK PRIVATE LIMITED PH NO 9704875189)

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QUIZ FOR CHEMISTRY

The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

1 point

3 billion years

100 years

0.01 minute

13 days

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The high reactivity of fluorine is due to

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its high electro negativity

small size of fluorine atom

C. availability of d-orbitals

strong F - F bond

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The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

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cineole

engenol

geraniol

limonene

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The method that cannot be used for removing permanent hardness of water is

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adding sodium carbonate

distillation

adding caustic soda

boiling

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The gas used in the manufacture of vanaspati from vegetable oil is

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hydrogen

oxygen

nitrogen

carbon dioxide

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The monomer of polythene is

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vinyl chloride

ethylene

ethyl alcohol

None of the above

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The mass of one Avogadro number of helium atom is

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1.00 gram

4.00 gram

8.00 gram

Option 4

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The hydronium ion is

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Option 1

Option 2

Option 3

Option 4

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The graphite rods in the nuclear reactor

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react with U to release energy

produce neutrons

undergo combustion which triggers the nuclear fission

convert fast moving neutrons into thermal neutrons

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The most electropositive elements among the following is

1 point

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Zone refining is used for the purification of

1 point

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The gas used for artificial ripening of green fruit is

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ethylene

ethane

carbon dioxide

acetylene

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The luster of a metal is due to

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its high density

its high polishing

its chemical inertness

presence of free electrons

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The inexpensive and commonly used variety of glass is called soda glass. It is called so because

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was used initially for making bottles of soda(carbonated drink)

is made using soda(sodium carbonate)

was initially used for storing sodium carbonate

is made using soda lime

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1 point

Option 1

Option 3

Option 4

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The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

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Option 1

Option 2

Option 3

Option 4

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1 point

Option 1

Option 2

Option 3

Option 4

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The molecule which has the highest percentage of ionic character among the following is

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HCI

HBr

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The most malleable metal is

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platinum

silver

iron

gold

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The iron ore magnetite consists of

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Option 1

Option 2

Option 3

Option 4

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The first metal used by man was

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iron

copper

gold

bronze

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The oil used in the froth floatation process is

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coconut oil

olive oil

kerosene oil

pine oil

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The mass number of a nucleus is

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always less than its atomic number

the sum of the number of protons and neutrons present in the nucleus

always more than the atomic weight

a fraction

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The items amenable to detection by soft x-rays are

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contrabands

lead in bullets

narcotics

genuine coins from counterfeit coins

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The material which can be deformed permanently by heat and pressure is called a

1 point

thermoplastic

thermoset

chemical compound

polymer

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