Question # 1

The mass of Al₂S₃formed when 20 grams Al reacts completely with S is

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60 g

50 g

50.55 g

55.55 g

Bessemer converter is used in the manufacture of

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Pig iron

Steel

Wrought iron

Cast iron

The fourteen elements following actinium are known as

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Lanthanones

Lanthanides

Rare earths

Actinides

When 6s orbital is complete then next electron goes to

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6p

6d

5d

4f

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

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Greater.

same.

Smaller.

Not fixed.

Phenol is used in the preparation of

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Bakelite

Phenatherene

Cellulose

All of these

Determination of atomic masses and invention of system of writing symbols was made by:

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J. Berzelius

Democritus

Dalton

None of above

The rate of reaction determined at a given time is called

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Average rate

Instantaneous rate

Specific rate

Overall rate

An electrochemical cell is based upon

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Acid-base reaction

Redox reaction

Nuclear reaction

None of the above

Which of the following is a carbonate are?

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Pyrolusite

Malchite

Diaspore

cassiterite

The substances which soften the polymer are called

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Stabilizers

Plasticizers

Retarders

Pigments

Cotton is ______% cellulose

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90

100

99

30

Quantum number value for 2p orbitals are:

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n=2 ,l=1

n=1 ,l=2

n= ,l=0

n=2 ,l=0

BOD is

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Biological oxygen deficit

Biosphere oxygen demand

Biological oxygen demand

None of the above

K_bfor NH₄OH is 1.81 x 10^-5, then K_avalue of its conjugate base is

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1.81 x 10⁺⁵

1.81 x 10^-9

5.5 x 10^-9

5.5 x 10^-10

A one thousand dm³sample of water contains one gram of iron (iii) ions what is the concentration in parts per million of Fe^3f(eq) in parts per million

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0.001

0.01

0.1

1.0

K_spvalue for PbSO₄= 1.8 x 10^-8mole²dm^-6. The maximum concentration of Pb⁺⁺ions is

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1.34 x 10^-4mole dm^-3

1.8 x 10^-4

3.6 x 10^-16mole dm^-3

1.0 x 10^-8mole dm^-3

Which statement is true for Na and Na⁺

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Size of Na is smaller than Na⁺

Size of Na is greater than Na⁺

Both have same properties.

Both have equal sizes.

Which one of the following pentafluorides cannot be formed?

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PF₅

AsF₅

SbF₅

BiF₅

The quantum number which determines the shape of the orbital is

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principal

azimuthal

magnetic

spin

When benzene is burnt in free supply of air, it is completely oxidized to

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CO

CO₂₊H₂O

H₂CO₃

None

Cyanoform is ________ acid in nature than the chloroform. The missing word is

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Stronger

Weaker

Amphoteric

Neutral

There are 20 amino acids found in protein which is not the property of these amino acids

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They are allα-amino acids

They are all optically active

They have high decomposition point

They are water soluble

Dehydration of glycerol give

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Propane

Propene

Acrolein

Benzene

Which of the substances Na, Hg, S Pt and graphite can be used as electrodes in electrolytic cells having aqueous solution?

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Na, Pt and graphite

Na and Hg

Pt and graphite only

Na and S only

Derivative of water is:

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Alcohals

Phenols

Either

Phenol

Lithium reacts with air to form

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Peroxide

Normal oxide

Superoxide

None of these

Aldehydes are reduced to :

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Pri-alcohol

Sec-alcohol

Ter-alcohol

All of these

Which of the following has zero depole-moment?

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CIF

PCl₃

SiF₄

CFCl₄

Which is the transition element among the following

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B

Al

Cu

Cs

Formaline Contains ______% alcohol

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80

37

8

52

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