Chemistry Test 168

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Chemistry Test 168

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Weekly Quiz Competition

Question 1
4 / -1

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionization energy of H=2.18 ×10^–18J atom^–1and h = 6.625 × 10^–34 J s ) [2004]

A
1.54 x 10¹⁵ s^-1

B
1.03 x 10¹⁵ s^-1

C
3.08 x 10¹⁵s^-1

D
2.00 x 10¹⁵ s^-1

Solution
Question 2
4 / -1

What is the mass of carbon dioxide which contains the same number of molecules as are contained in 40 g of oxygen?

A
40g

B
55g

C
32g

D
44g

Solution
Question 3
4 / -1

The density of a gas is 1.78 g L^-1 at STP. The weight of one mole of gas is

A
39.9 g

B
22.4 g

C
3.56 g

D
29 g

Solution

1 mole occupies a volume of 22.4 L at STP

Mass of 1 mole of a gas = Density x Volume

= 1.78 x 22.4 = 39.9 g
Question 4
4 / -1

The following quantum numbers are possible for how many orbital (s) n = 3, l = 2, m = +2 ? [2001]

A
1

B
3

C
2

D
4

Solution
Question 5
4 / -1

The value of Planck's constant is 6.63 × 10^–34 Js.The velocity of light is 3.0 × 10⁸m s^–1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 × 10¹⁵ s^–1 ? [2003]

A
3 × 10⁷

B
2 × 10^–25

C
5 × 10^–18

D
4 × 10¹

Solution
Question 6
4 / -1

The Mass of Atom is entirely due to ________.

A
Prototons & Neutrons

B
Neutrons

C
Electrons

D
None of the above

Solution

The mass of an atom is entirely due to its Nucleus.

Nucleus consists of protons and neutrons together known as nucleons.

An atom consists of a proton, neutron, and electron.

While calculating the mass of an atom, the mass of electron is neglected due to its relatively insignificant mass.

Mass of proton : 1.6727 X 10^-27 kg.

Mass of electron : 9.1093 X 10^-31 kg.

Mass of neutron : 1.6727 X 10^-27kg.

Protons and neutrons have approximately same mass.
Question 7
4 / -1

The element having tetra-atomic atomicity is ______ .

A
Helium

B
Nitrogen

C
Phosphorous

D
Chlorine

Solution

Key Points

The present number of atoms in any molecule of an element is called its atomicity.

Tetra atomic elements are those which are made up of four atoms.

Phosphorous exists as molecules made up of four atoms in a tetrahedral structure.

Each phosphorus molecule consists of four atoms of phosphorus.
Question 8
4 / -1

Alkali metals are assigned which group in the Modern Periodic Table?

A
Second group

B
Eighteenth group

C
Third group

D
First group

Solution

Group 1 elements in the Periodic table are known as Alkali metals

They have ns1 outermost configuration and belong to the S-block Elements.

They also have a strong tendency to donate their valence electrons in the outermost shell to form strong ionic bonds.

It contains elements from Lithium (Li) to Francium (Fr).
Question 9
4 / -1

Who was the first to propose Atomic Theory?

A
J.J. Thomson

B
Rutherford

C
John Dalton

D
Neils Bohr

Solution
Question 10
4 / -1

What is common among Lithium, Sodium and Potassium?

A
These have one electron in their outermost shell

B
There are alkaline earth metals

C
These cannot form oxides

D
These are inert elements

Solution

Lithium (Li), Sodium (Na), and Potassium (K) has one electron in their outermost orbits.

They belong to group 1 and hence they are Alkali Metals and not alkali earth metal.

Lithium can form lithium oxide, Sodium forms Sodium oxide and Potassium can form Potassium peroxide in the presence of oxygen.

They are not Inert elements as they react with other compounds.

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Chemistry Test 168

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Chemistry Test 168

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Question 1

1.54 x 1015 s -1

1.03 x 1015 s -1

3.08 x 1015 s -1

2.00 x 1015 s -1

Solution

Question 2

40g

55g

32g

44g

Solution

Question 3

39.9 g

22.4 g

3.56 g

29 g

Solution

Question 4

1

3

2

4

Solution

Question 5

3 × 107

2 × 10–25

5 × 10–18

4 × 101

Solution

Question 6

Prototons & Neutrons

Neutrons

Electrons

None of the above

Solution

Question 7

Helium

Nitrogen

Phosphorous

Chlorine

Solution

Question 8

Second group

Eighteenth group

Third group

First group

Solution

Question 9

J.J. Thomson

Rutherford

John Dalton

Neils Bohr

Solution

Question 10

These have one electron in their outermost shell

There are alkaline earth metals

These cannot form oxides

These are inert elements

Solution

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1.54 x 10¹⁵ s^-1

1.03 x 10¹⁵ s^-1

3.08 x 10¹⁵s^-1

2.00 x 10¹⁵ s^-1

3 × 10⁷

2 × 10^–25

5 × 10^–18

4 × 10¹