Question # 1

-------------acts are reserve energy sources.

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Enzymes

Vitamins

Proteins

Lipids

All chemical reaction involves.

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Enzymes

Catalyst

Energy changes

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

When old bonds are broken, the energy is.

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Release

Remain same

Consume

None of these

Who use the word energy for the 1st time

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Rutherford

Bohr

Thomas Young

None of these

The part of the universe that we want to focus our attention called.

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Surrounding

Energy

System

Both a and b

The word energy is used in physics ofr the firt time.

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1902

1858

1805

1802

Formation of NO is

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Exothrmic

Endothermic

No Heat Change

None of these

--------------- acts a catalyst promoting the breakdown of ozone.

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I2

Br2

Cl2

None

Which is not produced in an aerobic respiration.

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Carbon dioxide

Lactic acid

Water

Energy

Aerobic respiration releases........energy than anaerobic respiration.

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Equal

Less

More

None of these

Washing clothes at 140 ^oF uses almost the energy as at 140 ^oF wash

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Half

Thrice

Twice

None of the above

The enthalpy of reaction C+O2 ------ CO2

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-571.6 kJ

-393.5 kJ

+53.8 kJ

-110.5 kJ

No reaction occurs if the energy of reacting particles.......activation energy.

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Lower than

Greather than

Nearest to

Equal to

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Chemistry 9th Class English Medium Unit 5 Online Test MCQs With Answers

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