Structure of Atom Test

Result

Structure of Atom Test - 75

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Weekly Quiz Competition

Question 1
1 / -0

The ratio of masses of an element A attached with the fixed mass of another element B in their two compounds is 2: 3. If 48 mass of A is attached with 24 mass of B in first compound then what mass of A is attached with the 12 mass of b in the second compound?

A
72

B
36

C
24

D
12

Solution
Question 2
1 / -0

Aufbau principle does not give the correct arrangement of filling up of atomic orbital's in

A
Cu and Zn

B
Co and Zn

C
Mn and Cr

D
Cu and Cr
Question 3
1 / -0

One Bohr magneton is equal to ____________ $${ AM }^{ 2 }$$.

A
$$4.8\times { 10 }^{ -10 }eSu$$

B
$$1.6\times { 10 }^{ -19 }eSu$$

C
$$4.8\times { 10 }^{ -10 }\ eSu\ \& 1.6\times { 1 0}^{ -19 } \ eSu$$

D
$$9.27\times { 10 }^{ -24 }$$

Solution
Question 4
1 / -0

The de Broglie wavelength of an electron in $$n^{th}$$ Bohr orbit of radius $$a_n(a_0$$ being the first orbit radius$$)$$:

A
$$2\pi a_0$$

B
$$2\pi n^2a_0$$

C
$$2\pi na_0$$

D
$$\dfrac{2\pi a_0}{n}$$

Solution
Question 5
1 / -0

The ground state energy of hydrogen atom is $$-13.6$$ eV. The energy of second excited state $$He^+ ion$$ in eV is:

A
$$-6.04$$

B
$$-27.2$$

C
$$-54.4$$

D
$$-3.4$$

Solution

$$(E)_n^{th}=(E_{GND})_H^.\dfrac { Z^2 }{ n^2 }$$

$$E_{3rd}(He^+)=(-13.6eV)\times\dfrac { 2^2}{ 3^2 } =-6.04eV$$
Question 6
1 / -0

The number of the spectral lines obtained when an electron is provided with a photon of the energy of $$11\ eV$$ (for H atom) is/are:

A
$$1$$

B
$$2$$

C
$$0$$

D
$$6$$

Solution
Question 7
1 / -0

Which of the following are isotopes?
(i) Atom, whose nucleus contains 20p+15n
(ii) Atom whose nucleus contains 20p+17n
(iii) Atom, whose nucleus contains 18p+22n
(iv) Atom, whose nucleus contains 18p+21n

A
(i) and (iii)

B
(i) and (ii)

C
(ii) and (iii)

D
(ii) and (iv)
Question 8
1 / -0

According to Moseley's law, the ratio of the slope of graph between $$\sqrt { f } $$ and $$Z$$ for $${ k }_{ \beta }$$ and $${ k }_{ \alpha }$$ is

A
$$\sqrt { \dfrac { 32 }{ 27 } } $$

B
$$\sqrt { \dfrac { 27 }{ 32 } } $$

C
$$\sqrt { \dfrac { 5 }{ 56 } } $$

D
$$\sqrt { \dfrac { 36 }{ 5 } } $$

Solution
Question 9
1 / -0

From atomic number 58 to 71, elements are placed in :-

A
$${ 5 }^{ th }$$ period and III A group

B
$${ 6 }^{ th }$$ period and III B group

C
separate period and group

D
$${ 7 }^{ th }$$ period and IV B group

Solution
Question 10
1 / -0

The magnetic field at the center of a hydrogen atom due to the motion of electron varies with the principal quantum number as

A
$$n^{5}$$

B
$$n^{3}$$

C
$$1/n^{5}$$

D
$$1/n^{3}$$

Solution