Question # 1

Which one of the following gases has lowest density at room temperature:

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NH₃

Ne

N₂

CO

The shielding effect of inner electron is responsible for

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Having no effect on ionization energy

Decreasing ionization energy

Increasing ionization energy

Increasing electronegativity

Which of these has at least one d electron

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Sc+3

Mn+7

Ti+4

Cr+3

Liquids are less common than:

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Solids.

Plasmas.

Gases.

All of above.

How many CI^- ions are there around Na+ ion in NaCI crystal?

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3

4

6

8

The highest oxidation state of manganese is

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+7

-7

+6

+4

Which one of the following molecules show maximum hydrogen bonding?

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H₂O

H₂Se

H₂S

HF

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

In the body carbohydrates are broken down into:

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glucose

fatty acids

amino acids

nucleic acid

The relationship which describes the variation of vapour pressure with temperature is called

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Hess's law

Arrhenius equation

Kirchhoff's law

Clausius-Clapeyron equation

When two ice cubes are pressed together they unite to form one cube. which of the following forces is responsible for holding them together?

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H-bonding

Covalent bonding

van der waal's forces

dipole-dipole interaction

Alkyl halides ae considered to be very reactive compounds towards nucleophiles because

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They have an electrophilic carbon

They have an electrophilic carbon and a good leaving group

They have an electrophilic carbon and a bad leaving group

They have a nucleophilic carbon and a good leaving group

Antibonding MO is formed by

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Addition of atomic orbitals

Substraction of atomic orbitals

Multiplication of atomic orbitals

None of these

Amino acids contain functional groups in it:

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--CO--

--OH

---NH₂

All of these

Which reaction produces a free radical

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SN reaction

Homelytic fission reaction

Heterolytic fission reaction

Addition reaction

Hydrolysis of protein by 6M HCl gives peptides and thenα-amino acids. How manyα-amino acids molecules are obtained on the hydrolysis of a tetrapeptide

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2

3

4

5

The covalent radius of Cl atom is:

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99.4 pm.

176.7 pm

38 pm

76 pm.

Taste of lower alcohols is:

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Sweet

Bitter

Our

Salty

An organic compound has the following properties ; It gives a positive tri-iodomethane test; it gives a yellow ppt, with 2, 4-DNP regent; it does not react with Tollen's reagent . Which compound would give these results

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CH₃CHO

CH₃CH₂OH

CH₃CH₂COCH₃

CH₃CH₂CH₂CHO

One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having flouring trapped in it

Use a sorbent having Al₂O₃trapped in it

Acidic hydrolysis of acetamide gives

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Acetaldehyde

Acetic acid

Methyl amine

Formic acid

which of the following has smaller size:

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Fe+³

Fe+²

Fe+¹

Fe

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