Question # 1

Styrene has empirical formula CH, and there is 92.2%C and 7.75% hydrogen. If molar mass is 104g mol¯, what will be integral multiple (n) to get molecular formula:

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2

4

6

8

Photo chemical smog contains _________ as main reactants:

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nitrons oxide and unburnt hydrocarbons

niliric oxide and unburnt hydrocarbons

NO and burnt hydrocarbons

N₂O and burnt hydrocarbons

The enthalpies of all elements in their standard states are

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Unity

always +ve

always -ve

zero

Biological oxygen demand (BOD) is associated with

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Organic matter

Micro organisms

Both a and b

None

Hydrosphere includes

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Seas and rivers

Ocean & polar ice caps

Ground water

All of above

Which of the following least resemble an ideal gas?

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ammonia

helium

hydrogen

trichloromethane

The optimum pH value for the enzyme pepsin is

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10

1.4

8

6

Which is most acidic?

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H2O

C2H5OH

C4H9OH

CH3-CH2-CH2OH

Vegetable oils are:

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Unsaturated fatty acids

Glycerides of unsaturated fatty acids

Essential oils obtained from plants

To become a carbohydrate a compound must contain

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2-carbon

3-carbon

4-carbon

5-carbon

Which of the following is not the required condition for the formation of smog

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Sufficient NO

Sunlight

Less movement of air

Winds

The oxidation state of Fe in [Fe(CN)₆]^3-is

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+2

+3

+4

-3

1.12 dm³of N₂gas at S.T.P. has mass of N₂gas

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2.8 g

2.4 g

1.4 g

14 g

Polymer found by the combining of three different monomers is called:

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Homopolymer

Copolymer

Ter polymer

Thermoplastic polymer

2SO₂+ O₂⇌2SO₂H= 188KJ mole^-1

Which statement about following equilibrium is correct :

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The value ofK_pfalls with arise in temperature.

The value ofK_pis equal tok_c.

The value ofK_pfalls with the increase pressure.

Adding V₂O₅catalyst increase the equilibrium yield of Sulphur trioxide.

Which of the following statement about fluorine is not correct?

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Electron affinity of chlorine is greater than that of fluorine

Bond energy of fluorine is less than that of chlorine

Fluorine cannot be prepared by electrolysis of fused metal fluorides

Fluorine does not form oxoacid

Which of the following is not a hydrocarbon

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Butane

Methyl benezene

Acetylene

Glucose

To determine the rate of reaction chemically a graphical method is applied. A graph is plotted between the amount or reactant decomposed or product formed against the time. The rate d_x/d_tat any time is equal to

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k

Tangentθ

1/a, a is initial conc.

1/a²

Either, an organic compound has close resemblance in structure and thus a derivative of:

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Water

Oxides of lithium

Oxides of magnisium

Oxides of aluminium

Which of the following is commonly called polyamide

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Nylon

Rayon

Terylene

Oridon

NaHCO₃is commonly called

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Soda ash

Baking soda

Washing soda

None of these

The process in which one s and two p orbitals mix up with each other is called

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Sp-hybridization

Sp²-hybridization

Sp³-hybridization

Dsp²-hybridization

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