Question # 1

How many molecules of CO2 are formed by burning 12 g carbon with excess of oxygen.

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3.01 x 10²³

1 x 10²³

6.02 x 10²³

1.03x 10²³

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

What has a mass equal to that of one mole of water.

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22.4 dm3 of water

One mole of steam

One molecule of water

Two moles of hydrogen molecules and one mole of oxygen molecules.

Actual yield is mostly less than the theoretical yield due to the reason that

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Rates of reactions are slow

Loss of the product during handling

Reactions are never completed 100%

Law of conservation of mass is not true

A glass is full of water and contains 6.02 x 10²³molecules of H2O The mass of water molecules is.

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18 gm

90 g

120 g

180 g

In mass spectrometry, ions are produced by

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Heat at high temperature

Passing gas through high voltage plates

Throwing fast moving electrons on gas molecules

All of them

The volume occupied by 1.6 g of O₂at STP is

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22.4 dm³

2.24 dm³

1.12 dm³

112 dm³

the volume occupied by 1.4 of N2 at S.T.P is

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

A limiting reactant is that one which

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Gives greatest number of moles of products

Gives least number of moles of products

Is left behind after the completion of reaction

Is mostly a cheaper substance as compared to other reactants

Nickel has isotopes

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3

5

6

11

The largest number of molecules are present in

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3.6 of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

Haemoglobin is a Macro molecule and consists of approximately atoms.

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5000

10,000

68000

15000

One mole of ethanol and one mole of ethane have an equal

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Masses

Number of atoms

Number of electrons

Number of molecules

If the empirical formula of compound is CH2 and its molecular mass is 56 than what is the actual molecular formula of this compound.

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CH2

C2H4

C3H6

C4H8

The separation of the different isotopes in the mass spectrometer is done on the basis of

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Different amounts of positive changes

Charge e/m value different amounts of negative changes

Different m/e value

Velocities of the ions

Which statement is incorrect about 64 g of SO2.

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It is one mole SO2

The number of SO2 molecule are 6.02 x 10²³

The number of oxygen atoms are 6.02 x 10²³

The number sulphur atom are 6.02 x 10²³

Cadmium has isotopes.

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3

4

5

9

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