Chemistry Test 86

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Chemistry Test 86

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Weekly Quiz Competition

Question 1
4 / -1

Which one of the following pairs is not isoelectronic?

A
Ar and Cl^–

B
Na⁺ and Ne

C
Na⁺ and Mg²⁺

D
Mg⁺ and Ne
Question 2
4 / -1

The number of electrons which will together weigh one gram is :-

A
1.098 × 10²⁷

B
9.1 × 10³¹

C
1

D
1 × 10⁴
Question 3
4 / -1

How much energy would be required by an e^– while moving from ground state to 3^rd excited state of He⁺ ion -

A
40.8 eV

B
10.2 eV

C
51 eV

D
48.35 eV
Question 4
4 / -1

The kinetic energy of an electron in nth orbit of unielectron species of atomic number Z is 13.6 The potential energy of this electron in the same orbit will be :

A
+27.2

B
–6.8

C
13.6

D
-27.2
Question 5
4 / -1

If radius of nth shell is 2.116 Å for H-atom calculate velocity of e^– in the same shell.

A
2.188 × 10⁶ m/s

B
2.188 × 10¹² m/s

C
1.094 × 10⁶ m/s

D
1.094 × 10⁸ m/s
Question 6
4 / -1

h / 2πis angular momentum in ............. orbit of He⁺ ion :-

A
First

B
Second

C
Third

D
Infinite
Question 7
4 / -1

An electron in an atom jumps in such a way that its kinetic energy changes from x to x/4. The change in potential energy will be :-

A
+ 3/2 x

B
- 3/8 x

C
+ 3/4 x

D
- 3/4 x
Question 8
4 / -1

Which graph shows how the energy E of a photon of light is related to its wavelengths (λ) ?

A
(1)

B
(2)

C
(3)

D
(4)
Question 9
4 / -1

Line spectra is characteristic of :-

A
Molecules

B
Atom

C
Free radical

D
Ions

Solution

Atom have linear spectrum
Question 10
4 / -1

The ratio of the frequency corresponding to the third line in Lyman series of hydrogen atomic spectrum to that of the first line in Balmer series of Li²⁺ spectrum is :-

A
4/5

B
5/4

C
3/4

D
None of these

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Chemistry Test 86

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Chemistry Test 86

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Question 1

Ar and Cl–

Na+ and Ne

Na+ and Mg2+

Mg+ and Ne

Question 2

1.098 × 1027

9.1 × 1031

1

1 × 104

Question 3

40.8 eV

10.2 eV

51 eV

48.35 eV

Question 4

+27.2

–6.8

13.6

-27.2

Question 5

2.188 × 106 m/s

2.188 × 1012 m/s

1.094 × 106 m/s

1.094 × 108 m/s

Question 6

First

Second

Third

Infinite

Question 7

+ 3/2 x

- 3/8 x

+ 3/4 x

- 3/4 x

Question 8

(1)

(2)

(3)

(4)

Question 9

Molecules

Atom

Free radical

Ions

Solution

Question 10

4/5

5/4

3/4

None of these

User

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Ar and Cl^–

Na⁺ and Ne

Na⁺ and Mg²⁺

Mg⁺ and Ne

1.098 × 10²⁷

9.1 × 10³¹

1 × 10⁴

2.188 × 10⁶ m/s

2.188 × 10¹² m/s

1.094 × 10⁶ m/s

1.094 × 10⁸ m/s