Question # 1

Compounds X, Y and Z, all react with PCI₅to release hydrogen chloride, but only one of them reacts eith 2,4-dinitrophenylhydrazine reagent. Which one of the following combinations could be X, Y and Z

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Which compound does not show hydrogen bonding with water

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CH₃OH

C₂H₅OH

CH₃- O - CH₃

C₆H₅OH

The bond order O₂molecule is

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1

2

3

Zero

The presence of a double bond in a compound in the sign of:

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Saturation

Unsaturation

Subsitution

None

The total number of orbitals in a shell with principal quantum number 'n' is

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2n

2n²

n²

n + 1

The acid which has a peroxy linkage is

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Sulphurous acid

Pyrosulphuric acid

Dithionic acid

Caro's acid

Which of the following is halo form

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CHBr₃

CHCI₃

CHI₃

All of these

An organic compound A reacts with methyl magnesium iodide to form an addition product which on hydrolysis forms the compound B . Compound B gives blue colour salt in Victor Meyer's test.The compounds A and B are respectively

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Acetaldehyde, tertiary butyl alcohol

Acetaldehyde, ethyl alcohol

Acetaldehyde, isopropyl alcohol

Acetone, isopropyl alcohol

Identify the compound which has a bond angle of 109.5°

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Ethyne

Ethere

Methane

Benzene

In a group IIA from top to bottom as the atomic number increases, there is regular decreases in

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Ionic size

Atomic size

Ionization potential

None of these

Which of the following is fully fluorinated polymer?

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Neoprene

Teflon

Thiokol

PVC

n-butane and iso butane are an example of

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Chain isomerism

Positional isomerism

Meta merism

Functional group isomerism

Grignard's reagent on treatment with carbonyl compounds yield

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Pheonol

Alcohol

Alkane

None of these

Fe⁺³and Mn²⁺are strong paramagnetic because the number of unpaired electrons in each is

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4

5

6

7

The other name of cross linked polymers is

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Linear polymer

Branched polymer

Inter connected polymers

None of these

Where energy is released during a reaction it is

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Exothermic reaction

Endothermic reaction

A free radical reaction

A bond breaking reaction

The process of electrical coating of one metal on another to protect, decorate or to have greater resistance to corrosion is called

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Electroplating

Electrolysis

Conduction

Induction

Which of the following is a noble gas:

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Ne.

Cl₂.

H₂.

N₂.

The bond angles in methane CH₄are equal to

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109.5°

107.5°

104.5°

120°

Water shows maximum density at

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4°C

0°C

100°C

-4°C

Extent to H₂ + L₂à2Hl can be increased by :

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Increasing temperature.

Increasing product.

Increasing pressure.

Adding a catalyst.

A molecule of haemoglobin is made up if nearly

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10,000 atoms

50,000 atoms

2500 atoms

1500 atoms

Two H-atom combine to form a strong H₂molecule due to

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Increase in potential energy

Decrease in potential energy

Energy remains unchanged

Distance is increased

The temperature at which the vapour pressure of a liquid becomes equal to external pressure is

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Melting point

Sublimation point

Inversion point

Boiling point

An element in +3 oxidation state has the electronic configuration (Ar) 3d³. Its atomic number is

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24

23

22

21

When 6d orbital is complete, the entering electron goes into:

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7f.

7s.

7p.

7d.

Cotton has cellulose in it:

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96%

97%

98%

99%

Hydrogen chloride molecule contains

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Covalent bond

Double bond

Co-ordinate bond

Electrovalent bond

Pb has inert pair of electrons:

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One

Two

Three

Four

Phosphine is not obtained by the reaction when

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White P is heated with NaOH

Red P is heated with NaOH

Ca₂P₂reacts with water

PH₄l is boiled with water

Essentialα-amino acids are those which are necessary in the diet

Which one is an essentialα-amino acids

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Alanine

Aspartic acid

Glycine

Tryptophan

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