Question # 1

Which of the following statement is correct for a chemical reaction to occur molecules of substances must

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Collide with each other

Collide with energy more than activation energy

Collide with energy less than activation energy

Collide with high frequency

One mole of C₂H₅OH contains the number of H-atoms

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6.02 x 10²³

3.61 x 10²⁴

1.81 x 10²⁴

6.02 x 10²⁴

The largest number of molecules are present in

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3.6 g of H₂O

4.8 g of C₂H₅OH

2.8 g of CO

5.4 g of N₂O₅

The number of moles of CO2which contain 8.0 g of oxygen

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0.25

0.50

1.0

1.50

The mass of one mole of proton is

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1.008 g

0.184 g

1.673 g

1.008 mg

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

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Carbon monoxide

Diamond

Ethane

Methane

Which has greater number of moles

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0.1 g sodium

6.02 x 10²⁰atoms of magnesium

20 cm³0.1mole per dm³of NaOH

12.2 dm³of nitrogen at standard

[A_rNa = 23, Mg = 24, O = 16]

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8 g

16 g

32 g

24 g

When an electron is added to a uni positive ion we get:

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Cation

Molecule

Neutral atom

Anion

CL₂, N₂ and O_{2 are:}

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Diatomic molecules

Hetero atomic molecules

Poly-atomic molecules

Mono-atomic molecules

Isotopes differ in the

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Number of neutrons

Number of protons

Number of electrons

Number of atoms

Smallest particle of an element which may or may not have independent existence is known as:

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A molecule

An ion

An atom

An electron

A balloon contains 0.02 gram of H₂gas, it contains H₂molecules

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6.02 x 10²³

3.01 x 10²²

6.02 x 10²¹

3.01 x 10²¹

Which statement about an atom is true ?

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The number of neutrons is not equal to number of electrons

Mass number is less than atomic number

All the elements have only one mass number

Mass number can be equal to atomic number

Determination of atomic masses and invention of system of writing symbols was made by:

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J. Berzelius

Democritus

Dalton

None of above

C₆H₁₂O₆and C₁₂H₂₂O₁₁ are:

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Mono-atomic molecules

Diatomic molecules

Poly-atomic molecules

Hetero atomic molecules

Al³⁺is a symbol for aluminium

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Atom

Ion

Cation

Anion

When 0.1 g of magnesium is treated with an excess of hydrochloric acid, what volume of gas at room temperature and pressure will be produced

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10 cm³

25 cm³

48 cm³

100 cm³

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84.84 %

89.89%

81.81%

90.90%

The phenomenon of isotropy was first discovered by

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Soddy

Rutherford

Bohr

Dalton

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