Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 130

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Which of the following has the maximum number of atoms?

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Important Questions on Some Basic Concepts of Chemistry

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 131

The sum of number of protons, electrons, and neutrons present in

12 g

of

{}_{6}^{12}C

isotope is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 132

1.0 g

of hydrogen contains

6 \times 10^{23}

atoms. The atomic weight of helium is

4

. It follows that the number of atoms in

1 g

of

He

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 133

A sample of aluminium has a mass of $54.0 g$ . What is the mass of the same number of magnesium atoms?

$($ At. wt. $Al = 27, Mg = 24)$

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 134

The number of atoms in

558.5 g

of

Fe

(

At . wt . = 55.85

) is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 135

The total number of electrons present in

8.0 g

of methane is

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 136

The weight of $1 \times 10^{22}$ molecules of ${CuSO}_{4} . 5 H_{2} O$ is:

( Molar mass of $Cu = 63.5 g, S = 32 g, O = 16 g, H = 1 g$ ) $(Use Avogadro' s number as 6 \times 10^{23})$

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 137

How many moles of electrons weigh one kilogram?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 138

Under the same conditions of temperature and pressure, two gases have the same number of molecules. They must