Question # 1

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

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

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

Which one of the following substances is used as water absorber in combustion analysis.

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Mg(CIO4)2

50% KOH

Lime water

Dilute solution of NaOH

The Avogadro constant is the number of.

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Atoms in 1 g of helium ga

Molecules in 35.5 g of chlorine gas

Atoms in 6 h graphite

Atoms in 24 g of magnesium

The ration of number of molecules of 2 g H2 g to number of molecules of 64 g gaseous oxygen is.

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1:1

1:2

1:32

1:4

The volume occupied by 16 g of CH4 at S.T.P.

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224.14 dm3

22.4 dm3

1.12 dm3

2.24 dm3

The Number of moles of CO2 which contain 8.0 of oxygen.

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0.25

0.15

0.35

1.45

12.04 x 10²³atoms of nitrogen gas is equal to.

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1 mol

2 mol

3 mol

4 mol

Which of the following contains the same number of molecules as 9 g of water.

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2 g of hydrogen gas

14 g of nitrogen gas

32 g of oxygen gas

44 g of carbon dioxide gas

When one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide.

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Diamond

C2H6

Methane

CO2

If four moles of sulphur dioxide are oxidized to sulphur trioxide, how many moles of oxygen are needed.

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0.5

1.0

1.5

2.0

Stoichiometric calculations cannot applied to reversible reactions because.

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Product again changes to reactant

Less product is formed

Reaction goes only in one direction

Products do not disappear.

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

the number of Al³⁺ ion sin AlCl₃is 2.007 x 10²³. The number of Cl- ions are.

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6.02 x 10²³

3.01 x 10²³

1.5 x 10²³

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 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

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