Structure of Atom Test

Result

Structure of Atom Test - 59

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Weekly Quiz Competition

Question 1
1 / -0

In hydrogen atom, the electron is making $$6.6\times 10^{15}rev/s$$ around the nucleus in an orbit of radius $$0.528A^0$$. The equivalent magnetic dipole moment is :

A
$$1\times 10^{-15}Am^2$$

B
$$1\times 10^{-10}Am^2$$

C
$$1\times 10^{-23}Am^2$$

D
$$1\times 10^{-27}Am^2$$

Solution
Question 2
1 / -0

The velocity of the electron in 3rd orbit of hydrogen atom in $$cms^{-1}$$

A
$${ 4.88\times 10 }^{ 4 }$$

B
$${ 2.44\times 10 }^{ 8 }$$

C
$${ 7.29\times 10 }^{ 7 }$$

D
$${ 2.44\times 10 }^{ 12 }$$

Solution

For an electron,
$$ e = 4.803 \times 10^{-10}esu$$

$$m = 9.1\times 10^{-28}g$$

$$ z = 1 $$

Radius of $$3rd$$ orbit = $$r_1\times n^2$$ = $$0.529 \times 10^{-8} \times 9$$

$$V_n$$ = $$[ \dfrac{ze^2}{mr_n}]^{1/2}$$

$$V_n $$ = $$7.29\times10^7cm sec^{-1}$$

Hence,option C is correct.
Question 3
1 / -0

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

A
Atomic number of element is 4.

B
3 different types of spectral lines 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-atom

Solution
Question 4
1 / -0

A $$p -$$orbital can accommodate upto:

A
Four electrons

B
Six electrons

C
Two electrons

D
Eight electons

Solution

correct answer : 'B'

the p-orbital can accommodate upto

The s sublevel has just one orbital, so can contain 2 electrons max. The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the f sublevel has 7 orbitals, so can contain 14 electrons max
Question 5
1 / -0

The electron present in penultimate orbit of coinage metal atom are:-

A
8

B
18

C
2

D
32

Solution
Question 6
1 / -0

The maximum number of electrons that can be contained in

A
$$\text{4f subshell}$$

B
$$3^{rd}\ \text{shell}$$

C
$$\text{Both (A) and (B)}$$

D
$$\text{Neither (A) nor (B)}$$
Question 7
1 / -0

A trend common to both group $$I$$ and $$VII$$ elements in the periodic table as atomic number increase is

A
Atomic radius increase

B
Oxidising power increase

C
Reactivity with water increase

D
Maximum valency increase

Solution

As we move down the group number of shells increases and hence atomic radius increases down the group.
Question 8
1 / -0

The $$71^{st}$$ electron of an element $$X$$ with an atomic number of $$71$$ enters into the orbital:

A
$$4f$$

B
$$6p$$

C
$$6s$$

D
$$5d$$

Solution

Electronic Configuration of Element X with atomic number 71 is $$[Xe] 4{f}^{14} 6{s}^{2} 5{d}^{1}$$.

The Last electron will enter in 5d orbital.

Hence, the correct option is D.
Question 9
1 / -0

Electronic transition in $${\text{H}}{{\text{e}}^{\text{ + }}}$$ would emit light in which region when $${{\text{e}}^{\text{ - }}}$$ jumps from fourth orbit to second orbit :

A
UV

B
Visible

C
IR

D
No spectral region cab be defined

Solution
Question 10
1 / -0

The electron in hydrogen atom is in the first Bohr's orbit (n=1). The ratio of electronic transition energies, $$ \Delta E(n=1\rightarrow n=3)\ to \ \Delta E(n=1\rightarrow n=2)\ is $$:

A
32/27

B
16/27

C
32/9

D
8/9

Solution