Question # 1

The enthalpy of reaction 2H2 +O2-----2H2O

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-571.6 kJ

-110.5 kJ

-393.5 kJ

+53.8 kJ

A sub sheel that cna accommodate 6 electrons is

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b

s

f

p

Building block of all matter is.

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element

Compound

Mixture

Atom

How doe electrons keep themselves away from the oppositely charged nucleus.

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A agnetic field around the nucleus keeps them away

By keeping themselves stationary

By revolving around the nucleus

Due to their wave like nature

A reaction between an acid and a base produces

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Salt and an acid

Sald and base

Salt and water

Salt and gas

Which are good conductor of heat and electricity

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Metals

Non metals

Metalloids

All of these

Allotropes of oxygen are

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2

3

4

5

How many atoic mass units (amu) are there in one gram.

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1 amu

6.022 x 10²³

10 amu

6.022 x 10²²

How many electrons can be accommodated at the msot in the third shell of the elements.

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8

12

10

18

How many elements are prsent in each 2nd and 3rd period.

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2

32

18

8

How many atoms are present in one gram of H2O?

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1002 x 10²³ atom

6.022 x 10²³atom

0.334 x 10²³atom

2.004 x 10²³atom

An element has 5 electrons in M shell. Its tomic number is.

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5

10

15

20

Hydrogen and Helium follow.

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Octet rule

Triple rule

Duplet rule

None of these

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