Question # 1

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

2-Propenol, on rearrangement, yields

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Propanal

Propanone

2-propano

Both A and B

lonic solids don't conduct the electrical current because

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ion do not have translatory motion

free electrons are less

the coordination number of the ion is very high

strong covalent bonds are present in their structure

Nitrogen in the atmosphere is:

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78%

21%

0.9%

0.03%

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

Alkyl halides are considered to be very reactive compounds towards nucleophiles, because

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The have an electrophilic carbon

They have an electrophilic carbon and a bad leaving group

They have an electrophilic carbon and a good laving group

They have a nucleophilic carbon and a good leaving group

The elements like calcium nitrogen and phosphorus added into the soil in large amounts are called:

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basic elements

trace elements

additives

nutrient element

The order of reactivitv of alksI halides towards nucleophile is

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RI>RBr RF>RCI

RF>RCI>RBr>RI

RI>RBr> RCI>RE

RF>RBr>RCI>RI

The boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

The maximum hydrogen bonding is in:

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diethyl ether

ethanol

water

benzene

Lipids, proteins, carbohydrates and nucleic acids belong to macromolecules:

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inorganic

organic

Biopolymer

synthetic

Which acid is used in the manufacture of synthetic fibre?

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid

Which one of the following reagents will distinguish between C₆H₅CHO and C₆H₅COCH₃

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Aqueous bromine

Phosphorus pentachloride

2, 4 DNPH

Tollen's reagent

The detection of functional group is called :

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Numerical analysis.

Qualitative analysis.

Combustion analysis.

Quantitative analysis.

18 g glucose is dissolved in 90 g of water. The relative lowering vapor pressure is equal to :

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1/5

5.1

1/51

6

Rectified spirit contains alcohol about

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80%

85%

90%

95%

In the chemical combination of hydrogen and fluorine to form HF:

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Sodium atom donates major share of its electrons.

Hydrogen atom donates the major share of its electrons.

Both the atoms share the electrons equally.

None of above.

The ionic bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

Which one of the following is not a nuclelphile

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H₂O

H₂S

BF₃

NH₃

17.1 grams sucrose (C₁₂H₂₂O₁₁) dissolved in 250 cm³of solution. This has molarity

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0.1 M

0.2 M

0.01 M

0.02 M

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Complete conversion of A to B has taken place

Conversion of A to B is only 50% complete

Only 10% conversion of A to B has taken place

The rate of transformation of A to B is just equal to rate of transformation of B to A in the system

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