Structure of Atom Test

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Structure of Atom Test - 61

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Weekly Quiz Competition

Question 1
1 / -0

How many carbon atoms are present in palmitic acid?

A
$$16$$

B
$$20$$

C
$$18$$

D
$$12$$

Solution

Palmitic Acid is a saturated long-chain fatty acid with a 16-carbon backbone. It is the most common saturated fatty acid found in animals, plants and microorganisms. Its chemical formula is CH₃(CH₂)₁₄COOH.
Hence, option D is correct.
Question 2
1 / -0

The effective atomic number of Mn,in $$Mn_{2}(CO)_{10}$$is _____.

A
36

B
38

C
32

D
34

Solution

The formula for effective atomic number(EAN) is => Z - O.S + 2CN
here,
Z=atomic number
O.S=oxidation state
CN=coordination number
So, FOR 2 Mn
Z=2×25
O.S=0
CN=10 (for 10 CO ) + 1 (for 1 Mn-Mn sigma bond)
Thus CN = 11
EAN = 2×25 - 0 + 11×2
50+ 22
72
Thus 72 for 2 Mn
or 72/2 for 1Mn
= 36
Question 3
1 / -0

If the Thomson model is correct what should be the observation in the $$\alpha - ray$$ scattering experiment

A
All the $$\alpha - ray$$ should pass through the gold foil

B
Only few $$\alpha - ray$$ should pass through the gold foil

C
98% of $$\alpha - ray$$ should get reflected back

D
Both B & C

Solution

According to Thomson model, positive charge is uniformly distributed with electrons embedded in it like seeds of watermelon.
$$\alpha$$ ray is much heavier than proton as $$ \alpha=^{4}_{2}He^{2+}$$. Alpha particle has mass four times that of a proton. So since the positive charge is not concentrated in one place. So alpha ray will pass through the gold foil as there is no concentrated positive charge to stop it.
Hence, option $$A$$ would be the answer, if the Thomson model is correct.
Question 4
1 / -0

If an electron moves away from nucleus, its potential energy:

A
decreases

B
not changes

C
increases

D
none of these

Solution

As an electron moves away from the nucleus, its potential energy increases.
Hence, option C is correct.
Question 5
1 / -0

Which of the following pairs is not correctly matched

A
Effective ato,ic number of Pt in $${ \left[ { PtCl }_{ 6 } \right] }^{ 2- }$$

B
Absorption peak for $${ \left[ { Cr }^{ m }{ \left( { NH }_{ 3 } \right) }_{ 6 } \right] }^{ +3 }=21680{ cm }^{ -1 }$$

C
Crystal field stabilization energy of $${ d }^{ 2 }$$ in weak ligand field $$=\left( - \right) 0.8{ \Delta }_{ 0 }$$

D
Example of weak ligand field for $${ d }^{ 5 }$$ configuration $${ d }^{ 5 }$$
Question 6
1 / -0

$$E_n=-\dfrac{313.6}{n^2}$$, if the value of $$E_i=-34.84$$ to which value '$$n$$' corresponds:

A
$$2$$

B
$$4$$

C
$$1$$

D
$$3$$

Solution

Solution:- (D) $$3$$
$${E}_{n} = - \cfrac{313.6}{{n}^{2}}$$
For $${E}_{i} = -34.84; \quad n = ?$$
$$-34.84 = - \cfrac{313.6}{{n}^{2}}$$
$$\Rightarrow n = \sqrt{\cfrac{313.6}{34.84}} = 3$$
Hence the value of $$n$$ is $$3$$.
Question 7
1 / -0

The atomic number of an element represents :

A
number of neutrons in the nucleus

B
number of protons in the nucleus

C
atomic mass of element

D
valency of element

Solution

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element
Question 8
1 / -0

The energy of electron in the excited state of hydrogen atom is $$-0.85 eV$$. If 'h' is Plank's constant, the angular momentum of electron in the excited state is :

A
$$\dfrac{4h}{2 \pi}$$

B
$$h$$

C
$$\dfrac{3 h}{2 \pi}$$

D
$$\dfrac{h}{\pi}$$

Solution

Energy of the $$nth$$ state of H-atom $$E_n = \dfrac{-13.6}{n^2} \ eV$$
So, $$-0.85 = -\dfrac{13.6}{n^2}$$
Or $$n^2 = \dfrac{13.6}{0.85} = 16$$
$$\implies \ n = 4$$
Angular momentum $$L = \dfrac{nh}{2\pi} = \dfrac{4h}{2\pi}$$
Question 9
1 / -0

$$\dfrac { weight\quad of\quad one\quad atom\quad of\quad an\quad element }{ Its\quad atomic\quad weight } =x.$$
$$\dfrac { weight\quad of\quad one\quad molecule\quad of\quad a\quad compound }{ Its\quad molecular\quad weight } =y.$$
Then, x : y is

A
$$1:\frac { 1 }{ 12 } $$

B
$$2:1$$

C
$$1:2$$

D
$$1:1$$
Question 10
1 / -0

The average atomic mass of a sample of an element X is 16.2u. What are the percentage of isotope $$^{16}_8X$$ and $$^{18}_8X$$ in the sample respectively?

A
$$90$$%, $$10$$%

B
$$80$$%, $$20$$%

C
$$10$$%, $$90$$%

D
$$20$$%, $$80$$%

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Re-Attempt Weekly Quiz Competition

Structure of Atom Test - 61

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Structure of Atom Test - 61

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Question 1

$$16$$

$$20$$

$$18$$

$$12$$

Solution

Question 2

36

38

32

34

Solution

Question 3

All the $$\alpha - ray$$ should pass through the gold foil

Only few $$\alpha - ray$$ should pass through the gold foil

98% of $$\alpha - ray$$ should get reflected back

Both B & C

Solution

Question 4

decreases

not changes

increases

none of these

Solution

Question 5

Effective ato,ic number of Pt in $${ \left[ { PtCl }_{ 6 } \right] }^{ 2- }$$

Absorption peak for $${ \left[ { Cr }^{ m }{ \left( { NH }_{ 3 } \right) }_{ 6 } \right] }^{ +3 }=21680{ cm }^{ -1 }$$

Crystal field stabilization energy of $${ d }^{ 2 }$$ in weak ligand field $$=\left( - \right) 0.8{ \Delta }_{ 0 }$$

Example of weak ligand field for $${ d }^{ 5 }$$ configuration $${ d }^{ 5 }$$

Question 6

$$2$$

$$4$$

$$1$$

$$3$$

Solution

Question 7

number of neutrons in the nucleus

number of protons in the nucleus

atomic mass of element

valency of element

Solution

Question 8

$$\dfrac{4h}{2 \pi}$$

$$h$$

$$\dfrac{3 h}{2 \pi}$$

$$\dfrac{h}{\pi}$$

Solution

Question 9

$$1:\frac { 1 }{ 12 } $$

$$2:1$$

$$1:2$$

$$1:1$$

Question 10

$$90$$%, $$10$$%

$$80$$%, $$20$$%

$$10$$%, $$90$$%

$$20$$%, $$80$$%

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