Question # 1

Which of the following is a steroid?

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vitamin A

vitamin B

vitamin C

vitamin D

How many electrons have to be removed to ionize 1.0 x 10(-6) moles of Ne atoms to Ne+ ions in a neon advertising tube:

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6.02x10ê23/1.0x10ê-6

1.0x 10ê-6 x 6.02x 10ê23

1.0x10ê-6 x 6.02×10ê23/20.2

1.0x10ê-6 x 6.02x10ê23/9.65x10ê-1

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

What is the formula of magnesite?

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MgSO4. 7H2O

MgCO3

CaCO3

PbS

When gaseous chemicals are transported y road or by rail they are classified as follows:
flammable non-flammable poisonous
which gas is poisonous:

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butane

non-flammable

hydrogen

sulphur dioxide

Diamond and silicon carbide are insoluble in all solvents because

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they have high melting and boiling points

absence of three electrons

they are huge giant three dimensional molecules (macromolecules)

their unit cells have tetrahedral geometry

The intramolecular forces in gases are:

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Weak.

Normal.

Very weak.

Strong.

A pressure of 1Nm^-2 is equal to:

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one bar

one pascal

stalagmometer

one aomosphere

Polyesters resins have special use in:

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Clothing

Paints

Emulsion

Floor covering

The respiration process taking place in animals depends on a difference in

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Partial pressure

Osomotic pressure

Vapour pressure

Atomospheric pressure

Oxidation of secondary alcohol produces

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Aldehyde

Ketone

Alkyl halide

Ester

When electron jumps from n₂= 2,3,4,5,.... orbit to n₁= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

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Lyman series

Blamer series

Paschen series

Brackett series

Energy of electron in first orbit of H atom is

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-45.32 KJ/mole

-82.08 KJ/mole

-52.53 KJ/mole

-1313.31 KJ/mole

Which behaves as insulator for animals body?

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Carbohydrates

Proteins

Fats

Skin

Organic compounds resemble to those of inorganic compounds having same

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Ionic properties

Carbon forming long chain or rings

Chemical forces

Isomerism

The driving force for making a bond is

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To attain noble gas electronic configuration

To make soled compounds

To make different compounds

To make gaseous substances

Transition metals mostly are

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Diamagnetic

Paramagnetic

Neither diamagnetic nor paramagnetic

Both diamagnetic and paramagnetic

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Fe is reduced

Fe is oxidized

Cl₂is oxidized

None of these

Which of the following solution have zero pH

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1 M HCI

MH₂SO₄

0.1 M HNO₃

1 M CH₃COOH

In public urinals, we observe some nascent smell. This smell is due to

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Hydrolysis of urea of urine by urease of atmosphere into NH₃and CO₂

Formation of sulphonic acid by urea of urine

Reaction of CO₂of atmosphere with urea monoitrate in urine

Hydrogen present in air reacts with nitrogen forming NH₃

Which of the following liquid pairs shown a positive deviation from Raoult's law

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CH₃COOH₃+ CH₃CI

C₆H₆+ CH₄OH

H₂O + HCI

H₂O + HNO₃

Which of the following is used as disinfectant

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K₂Cr₂O₇

KMnO₄

K₂MnO₄

K₂CrO₄

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