Question # 1

Diamond is a bad conductor because.

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It has tight structure.

It has a high density

There is no free electron present in the crystal of diamond to conduct electricity

None of the above

When water freezes, its volume increase.

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12%

9%

15%

18%

One mole of Carbon -12 has mass

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0.012 kg

1 kg

0.022 kg

12 kg

In stoichiometric calculations

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The reaction can be reversile

Side products can be formed

Law of conservation of mass may not be obeyed

Law of definite proportions is definitely obeyed

Which of the following molecules have highest bond energy

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F2

Cl2

Br2

I2

18 g of glucose is dissolved in 90 g of water. The relative lowering of vapour pressure is equal to

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1/5

5.1

1/51

6

In silver oxide battery, anode is made of.

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Zinc

Copper

Lead

Graphite

How many atoms are present in half mol of oxygen gas. Gas exist in diatomic state.

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3.01 x 10²³

6.02 x 10²³

2 x 10²³

1.003 x 10²³

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

Two solution of NaCI and KCI are prepared separately by dissolving same moles of them in the fixed amount of solvent. Which of the following statements is true for these solution

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KCI solution will have higher boiling point than NaCI solution

Both the solutions have different boiling point

KCI and NaCI solution possess same vapour pressure

KCI solution possesses lower freezing point than NaCI solution

If uncertainty position of an electron is zero, the uncertainty in its momentum would be

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Zero

Infinite

Both a and b

None of these

Which concentration unit is independent of temperature.

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Molarity

Molality

ppm

both a and b

Which of the following is a polar molecule

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CCl4

HCl

BF3

CO2

In discharge tube, properties of X-rays depend upon the nature of.

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Residual gas

Cathode plate

Anode plate

All of these

Which electron traveled more distance, when jump from

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n1 to n2

n2 ato n3

n3 to n2

n3 to n4

Which statement is true about Na and Na+

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size of Na is greater than Na+

Size of Na is smaller than Na+

Both have equal size

Both have same properties

The mass of one mole of electrons is.

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

The rate of reaction determined at any given time is called.

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Average rate

Instantaneous rate

Spontaneous rate

Over all rate

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