Question # 1

A reaction in which an atom or a group of atoms replaces an atom or a group of atoms in the molecule of a substance is known as

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Addition reaction

Condensation reaction

Elimination reaction

Substitution reaction

Which of the followingα-Amino acids has basic R-group

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Proline

Glutamic acid

Histidine

Valine

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Electronphilic substitution

Electrophilic addition

Free radical substitution

Nuclephilic substitution

Which of the following is hypnotic?

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Acetaldehyde

Metaldehyde

Paraldehyde

None

Exposure to CO results in

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Headache

Fatigue

Unconsciousness

All of these

N-atom forms three covalent bonds, its electronic configuration is

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Which one of the following is not an alkali metal

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Francium

Caesium

Rubidium

Radium

Statement enthalpy of combustion of H₂is -285.8 KJ mole^-1then which is the standard enthalpy of formation of water

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+285.8 KH mole^-1

-285.5 KJ mole^-1

Zero

-218 KJ mole^-1

The oxide of beryllium is

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Acidic

Amphoteric

Superoxide

Basic

Objects of the size of an atom can be observed in

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An electron microscope

An x-ray spectrum

Atomic absorption spectrum

A visible spectrum

Osmotic pressure of a solution increases by

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Decreasing the temperature

Increasing the volume

Increasing the number of molecules of the solute

None of the above

What is the shape of Fe(CO)₅molecule?

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Tetrahedral

Octahedral

Trigonal bipyramidal

Square pyramidal

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

Which element has 4 unpaired electrons in 3d-orbital

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Chromium - 24

Manganese - 25

Iron - 26

Cobalt - 27

The boiling point of heavy water is

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108°C

101.4°C

99°C

110°C

The osmotic pressure of solution increases if

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Temperature is decreased

Solution constant is increased

Number of solute molecules are increased

Volume is increased

Which property is not present in lipids?

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Liquid

Solid or semi solid

Soluble in water

Form emultion

Density of aluminium is (g cm^-3):

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B

Al

Si

Ge

Anode is the surface on which probability of finding electron is:

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50%

Less than 10%.

More than 95%.

Zero.

Aldehyde and small methyl ketones form crystalline ______ ppts with saturated sodium bisulphate solution

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White

Red

Yellow

None of these

Which of the following has highest bond order

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One mole of SO₂contains

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6.02 x 10²³atoms of oxygen

18.1 x 10²³, molecules of SO₂

6.02 x 10²³atoms of sulphur

4 gram atoms of SO₂

When the 6d orbital is completed the entering electron goes into

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7f

7 s

7 p

7 d

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 V₂O₅ catalyst increase the equilibrium yield of Sulphur trioxide.

By simply reacting Grignand's reagent with water we get

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An alkane

Higher alkane

An alkene

An alkyne

Which period starts from ₁₁Sc to ₃₀Zn ?

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First Period

Second Period

Third Period

4th Period

Alkyl halides in which a halogen atom is bonded to that carbon atom which directly bonded with one hydrogen atom is called

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

Quaternary alkyl halides

The two half cells of a galvanic cell are connected by

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Ammeter

Salt bridge

Hydrogen electrode

Copper electrode

Coal is used to bake bricks in lime kiln:

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40%

60%

80%

None of these

Which of the following statements about acetic, anhydride is not correct

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It is immiscible with water but is hydrolysed to give acetic acid

It is prepared by the action of actyl chloride on the sodium salt of acetic acid

it reacts with ammonia to give acetamide

it is a strong acid

Which statement is not true. A solution is a homogeneous mixture of

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Two ionic substance like NaCl and HCl

Two molecular substances sugar and water

A solute and a solvent 1% NaHCO₃in water

NaCl and sand

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