Structure of Atom Test

Result

Structure of Atom Test - 74

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Weekly Quiz Competition

Question 1
1 / -0

In which sequence the radioactive radiations are emitted in the following nuclear reaction?
$$_{Z}X^{A} \rightarrow _{Z+1}Y^{A} \rightarrow _{Z-1}K^{A-4} \rightarrow _{Z-1}K^{A-4}$$

A
$$\gamma, \alpha ,\beta$$

B
$$\alpha ,\beta,\gamma$$

C
$$\beta,\gamma,\alpha$$

D
$$\beta,\alpha,\gamma$$

Solution
Question 2
1 / -0

Which of the following is inversely proportional to the square of principal quantum number in Bohr's atomic model?

A
Total energy of the electron in $$n^{th}$$ orbit.

B
Radius of the $$n^{th}$$ orbit.

C
Frequency of revolution in $$n^{th}$$ orbit.

D
Time period of revolution in $$n^{th}$$ orbit.

Solution
Question 3
1 / -0

If the boiling point of ethanol (molecular weight = 46 ) is $$78^o$$C, the boiling point of diethyl ether (molecular weight = 74) is

A
$$100^o$$C

B
$$78^o$$C

C
$$86^o$$C

D
$$34^o$$C

Solution
Question 4
1 / -0

In an atom having $$2K, 8L, 8M$$ and $$2N$$ electrons, the number of electrons with $$m=0$$; $$s=+\dfrac{1}{2}$$ are?

A
$$6$$

B
$$2$$

C
$$8$$

D
$$16$$
Question 5
1 / -0

In a hydrogen like sample electron is in $$2nd$$ excited state, the binding energy of $$4th$$ state of this sample is $$-13.6\ eV$$, then incorrect statement is :

A
Atomic number of element is $$4$$.

B
$$3$$ different types of spectral line will be observed if electrons make transition upto ground state from the $$2nd$$ excited state.

C
A $$25\ eV$$ photon can set free the electron from the $$2nd$$ excited state of this sample.

D
$$2nd$$ line of Balmer series of this sample has same energy value as $$1st$$ excitation energy of $$H-$$atoms.

Solution

As we know,

$$ E=-13.6 \frac{Z^2}{n^2}. $$

For n=5(4th excited state) Z=5. For Z=5 E and n =3(2nd excited state) E is $$ 13.6* \frac{25}{9}=37.77 $$

Sinece 37.7 > 25 therefore the electron cant be set free .

As all options match except D.

Hence , option D is correct .
Question 6
1 / -0

What is the maximum number of electrons that can be accommodated in the outermost orbit?

A
2

B
8

C
3

D
18

Solution

correct answer: option 'B'
the maximum number of electrons that can be accommodated in the outermost orbit is - 8

The outermost shell in an atom cannot have more than eight electrons even if it has a capacity to take up more electrons. This is also called the octet rule
Question 7
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The speed of sound in air is $$v$$. Both the source and observer are moving towards each other with equal speed $$u$$. The speed of wind is$$w$$ from source to observer. Then, the ratio $$(\cfrac{f}{{f}_{0}})$$ of the apparent frequency to the actual frequency is given by

A
$$\cfrac{v+u}{v-u}$$

B
$$\cfrac{v+w+u}{v+w-u}$$

C
$$\cfrac{v+w+u}{v-w-u}$$

D
$$\cfrac{v-w+u}{v-w-u}$$

Solution

$$\begin{array}{l} f=\left( { \dfrac { { v+u+w } }{ { v-u+w } } } \right) { f_{ 0 } } \\ \Rightarrow \dfrac { f }{ { { f_{ 0 } } } } =\left( { \dfrac { { v+u+w } }{ { v-u+w } } } \right) \\ Hence, \\ option\, \, C\, \, is\, \, correct\, \, answer. \end{array}$$
Question 8
1 / -0

Suppose that in any Bohr atom (or) ion orbits are only in even numbers like $$2,4,6,....$$ the maximum wavelength of radiation emitted in the visible region of hydrogen spectrum should be ______________.

A
$$\dfrac{4}{R}$$

B
$$\dfrac{R}{4}$$

C
$$\dfrac{36}{5R}$$

D
$$\dfrac{16}{3R}$$

Solution
Question 9
1 / -0

Which of the following orbitals has the lowest energy?

A
$$4d$$

B
$$4f$$

C
$$5s$$

D
$$5p$$

Solution

The energy of the orbitals are calculated using $$n+l$$ values of orbitals.
$$4d=4+2=6$$
$$4f=4+3=7$$
$$5s=5+0=5$$
$$5p=5+1=6$$

So $$5s$$ lowest energy.

Hence, option C is correct.
Question 10
1 / -0

$${ M }^{ 3+ }$$ has electronic configuration as $$[Ar]{ 3d }^{ 10 }{ 4s }^{ 2 }$$. Hence it lies in:

A
s-block

B
p- block

C
d-block

D
f-block

Solution