Question # 1

Isotopes of an element differ in

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Number of protons

Number of electrons

Number of neutrons

Number of electrons and protons

Which statement is true for Na and Na⁺

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Size of Na is smaller than Na⁺

Size of Na is greater than Na⁺

Both have same properties.

Both have equal sizes.

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

Phenol is more readily soluble in

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Dil. HCl

Both NaOH and HCl

NaOH sol

Sodium bicarbonate solution

The formula of esters is

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The energy of the first electron is helium will be

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-13.6 eV

-54.4 eV

-5.44 eV

zero

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.

Aromatic carboxylic acids have carboxyl group attached to group :

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Alkyl group

Aryl group

Phenyl group

Benzyl group

A compound possessingα-hydrogen atom, in the presence of dilute alkali formsβ-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is

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CH₃CHO

CH₃CH₂CHO

CH₂= CH - CHO

HC = C - CHO

Aldehydes which do not haveα-hydrogen undergo

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Aldol combination

Cannizzaro's reaction

Substitution

Elimination

Benzene was discovered by Michael Faraday's in

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1824

1825

1826

1827

Which isomer of C₅H₁₁OH gives, one dehydration, the greastest number of different alkenes

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Which of the following is acidic?

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SO₃

N₂O

BeO

HgO

Mass spectrometer measures the

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Exact mass of an element

Average mass of an element

The number of elements present in a molecule

m/e value of a positive ion

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

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7f

7 s

7 p

7 d

The atomic radius increases as we move down a group because

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Effective nuclear charge increases

Atomic mass increases

Additive electrons are accommodated in new electron level

Atomic number increases

Number of sigma bonds in P₄O₁₀is

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6

7

17

16

When a carboxylic acid reacts with alcohol, it produces a new class of compounds

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Ethers

Esters

Anhydride

Amides

Alkanes are gases :

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C₁-C₄

C₅-C₁₀

C₁₁-C₁₅

C₁₀-C₂₀

Which colour is imparted by sodium

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Yellow

Violet

Red

Crimson

Preparation of vegetable ghee involves:

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Halogenation

Hydrogenation

Hydroxylation

Dehydrogenation

Chloroflurocarbon releases a chemical harmful to ozone

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Fluorine

Chlorine

Nitrogen peroxide

Sulphure dioxdie

Oxidation of 2-propanol gives

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Propanone

Butanone

Pentanone

None of these

Plastics are a pollution problem because many plastics

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

Which one does not declourized KMnO₄

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Alkenes

Alkynes

Bezene

All above

Butanenitrile is formed by reaction of KCN with

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Propyl alcohol

Butyl chloride

Butyl alcohol

Propyl Chloride

Mercury is the only metal which is liquid at 0°C. this is due to its

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Very high ionization energy and weak metallic bond

Low ionization potential

High atomic weight

High vapour pressure

A fibre which is made from acrylonitrile as monomer

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

The tip of funnel should be 1 or 2cm larger than the circle of the

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Beaker

Solid

Filter paper

Liquid

In OF₂, number of bond pairs and Ione paris of electrons are respectively

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2,6

2,8

2,10

2,9

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