Structure of Atom Test

Result

Structure of Atom Test - 76

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Weekly Quiz Competition

Question 1
1 / -0

The equivalent weight of a metal is 4.5 and the molecular weight of its chloride is 80. Find the atomic weight of the metal.

A
9

B
12

C
15

D
18

Solution
Question 2
1 / -0

The electric potential between a proton and an electron is given by $$V=VIn\dfrac { r }{ { r }_{ 0 } } $$, where $${ r }_{ 0 }$$ is a constant. Assuming Bohr's model to be applicable,write variation of $${ r }_{ n}$$ with $$n,\ n$$ being the principal quantum number.

A
$${ r }_{ n }\propto n$$

B
$${ r }_{ n }\propto \dfrac { 1 }{ n } $$

C
$${ r }_{ n }\propto { n }^{ 2 }$$

D
$${ r }_{ n }\propto \dfrac { 1 }{ { n }^{ 2 } } $$

Solution
Question 3
1 / -0

For an atom with atomic number 14, the number of orbits and orbitals in which electrons are present is respectively:

A
$$3,6$$

B
$$6,3$$

C
$$7,3$$

D
$$3,8$$
Question 4
1 / -0

Imagine an atom made of a proton and a hypothetical particle of double the mass as that of an electron but the same charge. Apply Bohr theory to consider transitions of the hypothetical particle to the ground state . Then, the longest wavelength (in terms of Rydberge constant for hydrogen atom ) is

A
$$\dfrac { 1 } { 2 R }$$

B
$$\dfrac { 5} { 3 R }$$

C
$$\dfrac { 1 } { 3 R }$$

D
$$\dfrac { 2 } { 3 R }$$

Solution
Question 5
1 / -0

Which of the following elements has two shells, both of which are completely filled with electrons?

A
Hydrogen (H)

B
Boron (B)

C
Helium (He)

D
Neon (Ne)

Solution
Question 6
1 / -0

After the filling of np-orbitals next orbital filled will be:

A
ns

B
nd

C
(n-1)d

D
(n+1)s
Question 7
1 / -0

The hydrogen atom in ground state is excited by a monochromatic radiation of $$ \lambda=975 A^{\circ} $$ . Number of spectral lines in the resulting spectrum emitted will be

A
3

B
2

C
6

D
10

Solution
Question 8
1 / -0

A radioactive element $$X$$ converts into another stable element $$Y .$$ Half-life of $$X$$ is 2$$h$$ . Initially,only $$X$$ is present. After time $$t$$ , the ratio of atoms of $$X$$ and $$Y$$ is found to be $$1 : 4 .$$ Then $$t$$ inhours is

A
$$2$$

B
$$4$$

C
between $$4$$ and $$6$$

D
$$6$$
Question 9
1 / -0

Calculate minimum number of electrons in $$Fe$$ atom having $$(n+l) \ge 4,\ m=-1, \ s=+\frac { 1 }{ 2 } $$.

A
1

B
2

C
3

D
4
Question 10
1 / -0

If mass of one atom is $$3.32\times { 10 }^{ -23 }g$$, then calculate no. of nucleons present in 2 atoms of the element :

A
40

B
20

C
10

D
40 Na

Solution