Question # 1

How many lone pairs are present on nitogenin ammonia molecule.

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One

Two

Three

Four

Which is deal with compositon, structure, properties, behavior and changes of matter and energy.

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Technology

Chemistry

Engineering

Science

When NaOH and HCl are mixed the temperature increases. The reaction

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Exothermic with a negative enthalpy chagne.

Endothermic with a positive enthaly change.

Endothermic with a negatie enthalpy change

Exothermic with a positive enthealpy change

What information was obtained fom discharge tube expriments?

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Electrons and protons were discovered

Structur eof atom was discovered

Neutrons and protons were discovered

Presence of nucleus in an atom was discovered

The elements of a group show properties.

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Same

Different

Both a and b

None of these

A compound with chemicla formula Na₂CX₃ has formula mass 106 ami. Atomicmass of the elemetn X is.

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16

23

12

106

Uni of electron affinity is.

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k J mol-1

k jmol

pm

Newton

Diamond is...................

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conductor

non -conductor

both a and b

None of these

Actinide series starts after the element

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Actinium

Lanthanum

Osmum

Silver

Whcih subshells are present in L - shell?

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S and P

Only s -sub shell

Only p - sub shell

Sub shell

How many state of matter exist.

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One

Two

Three

Four

Formula of common salt is

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NaCl

AgCl

LiCl

KCl

Whcih element is presnet in 2nd period.

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Lithium

Beryllium

Boron

All of these

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Chemistry 9th Class English Medium Online Test MCQs With Answers

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