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Tag: Chemistry Mcqs for All Public Service Exams

Chemistry Mcqs for All Public Service Exams

Chemistry Mcqs For All Public Service Exams

The temprature at which a gas liquefies under 1 atm of pressure is called the

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critical temprature
boilig point
normal boiling point
triple point

A real gas is one in which:

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gases shows deviation from gas laws
volume of the molecules become significant
attraction beteen molecules exists
All are correct

The mechanism of the dehydration of an alkene involves

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carbanion formation
hydride ion transfer
free radical formation
carbonium ion formation

Elements with same electronic configration in their outermost occupies energy level have

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Different physical and chemical properties
Same physical and chemical properties
similar physicsl and chemical properties
same atomic radii

THe formula which represent the simplest ratio of atom is:

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Molecular formula
Empirical formula
Structural formula
none of the above

Molecule in which the disteen between the two adjective carbon atoms is largest is:

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ethane
ethene
ethyne
benzene

Which of the following atoms would be dimagnetic:

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O
Al
K
Ne

Astatine is the element below iodine in group.VII of the periodic table.which one of the following predictions about chemistry of astatine and its compounds id likelyto be correct

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Asfatine is a solid at room temperature
Asfatine is more reactive than iodine
Hydrogen astatide is a weak acid
Hydrogen astatide is thermally stable

Which is the sweetest of all the suger?

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fructose
glucose
lactose
sucrose

IF gasses is cooled suddenly then it becomes

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brittle
malleable
soft
transparent

Enthalpy is a/ an:

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extensive property
intensive property
state function
A & B are correct

Presence of hydrogen bonding between molecules of a substance result:

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increase in melting point
increase in density
slow the rate of evaporation
all fo the above

Dry ice is

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ice wich has been dried with the help of filter paper
solid carbon dioxide
solid sulpher dioxide
ice found on mountains

A system interacts readily with its sorrounding, exchanging matter and energy; the system is:

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an open system
a closed system
an isolated system
None of these

Chemical composition of pearl is:

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calcium carbonate
calcium sulphate
calcium carbonate and magnesium carbonate
calcium chloride

Which compound has the highest boilling point?

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HI
HBr
HCL
HF.

Sodium ions do not react with water sine:

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they are positively charged
the possess a stable electrons configuration
they are soluble in water
they are chemical unreactive

Oxygen atom in R. O. R has ………………… unshared electrons pair.

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one
two
three
four

…………… bond is formed due to parallel overlapping of atomic orbital is:

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sigma bond
pi bond
super bond
ionic bond

Which of the following is used for the manufacture of synthetic petroleum

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aromatisation
cracking
fischer-troopsch process
fractional distillation

Calculate the percentage of oxygen in heavy water?

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80%
60%
50%
20%

Which of the following groups have + I group

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Alkyl
Halogen
Phenyl
Nitro

One can ignore attractive forces and size effect in a gase at:

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high pressure
low temperature
low temperature and high temperature
low temprature and high pressure

15 liters of hydrogen combine with nitrogen to produce ammonia. the volume of ammonia in litres formed is:

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10 liters
5 liters
8 liters
12 liters

Astatine is the element below iodine in group.VII of the periodic table.which one of the following predictions about chemistry of astatine and its compounds id likelyto be correct

Select appropriate answer from following

Asfatine is a solid at room temperature
Asfatine is more reactive than iodine
Hydrogen astatide is a weak acid
Hydrogen astatide is thermally stable

Chemistry Mcqs For All Public Service Exams

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