Question # 1

How many elements are present in 1st period.

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1

2

8

18

Hydrogen and Helium follow.

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Octet rule

Triple rule

Duplet rule

None of these

Empricial formula of sand is.

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SiO2

SiO3

SiO4

SiO

Acid rain has pH less than.

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6

7

7.4

5.6

Number of moels in 29.25 g NaCl is.

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0.50

0.25

0.21

0.75

Which is the softtest metal.

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Zn

Ca

Na

Al

A good example of homogeneious mixture is.

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Soil

Ice-Creem

Rock

Wood

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

Whcih is true about the equilibrium state?

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The forard reaction stops

Both forward and reverse reactions stop

Both foward and reverse reactions continue at the same rate

The reverse reaction stops

How many periods are present in the modern periodic table

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7

8

10

12

Mixture can be separated by means of

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Nuclear method

Phyical medhod

Chemical Method

All of these

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

Why is H₂Oa liquid while H₂S is a gas?

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Becuase in waer, the atomic size of oxygen in smaller than that of Sulphur

Because water can easily freeze into ice

Because water is a polar compound ad tere exists strong forces of attrction betwene its molecules

Because H₂O molecule is lighter than H₂S

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