Structure of Atom Test

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Structure of Atom Test - 62

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Question 1
1 / -0

General electronic configuration of outermost and penultimate shell is $$(n-1)s^{2}(n-1)p^{6}(n-1)d^{x}ns^{2}$$ If n = 4 and x = 5, then number of protons in the nucleus will be :-

A
> 25

B
< 24

C
25

D
30

Solution
Question 2
1 / -0

Write the S.I. unit of activity.

A
$$Becquerel$$

B
$$Henry$$

C
$$Ohm$$

D
$$Mendel$$

Solution

$$S.I.$$ Unit of activity : It is the count rate of radioactivity.
It's $$S.I$$ Unit is decay per second $$=1\ Bq$$
where $$Bq=Becquerel (\because 1\ Bq=1\ decay\ per second)$$
Question 3
1 / -0

What mass of solid ammonium carbonate $$H_2NCOONH_4$$, when vaporized at $$273^oC$$, will have a volume of $$ 8.96\ 1$$ at $$760\ mm$$ of pressure. Assume that the solid completely decomposes as
$$H_2NCOONH_4(s)\to CO_2(g)+2NH_3(g)$$

A
$$15.6\ g$$

B
$$5.2\ g$$

C
$$46.8\ g$$

D
$$7.8\ g$$

Solution

$$H_2NCOONH_4(s)\longrightarrow CO_2(g)+2NH_3(g)$$
gases moles $$=a+2a=3a$$
$$pv=nRT$$
$$n=\dfrac {Pv}{RT}=\dfrac {760\times 8.96}{760\times 0.082\times 546}$$
$$3a=0.2$$
$$a=0.056$$
mass $$=a\times molar\ mass\ NH_2COONH_4$$
$$=0.066\times 78$$
$$=5.14$$ gram
option $$"b"$$ correct
Question 4
1 / -0

Twenty molecular of $$SO_3$$ will weight as much as _____ molecular of oxygen.

A
$$100$$

B
$$50$$

C
$$15$$

D
$$8$$

Solution

The weight of one $$SO_3$$ molecule $$ = 32+( 3\times16 )$$

$$= 32+48=80u$$

Weight of twenty $$SO_3$$ molecule $$= 20\times80=1600u$$

Weight of each molecule of oxygen$$=2\times16=32u$$

Therefore, the no. of oxygen molecules $$= \dfrac{1600}{32}$$ $$=50$$

So, the correct option is $$B$$
Question 5
1 / -0

How many spectral line of balmer series present in visible region?

A
$$5$$

B
$$4$$

C
$$2$$

D
$$3$$

Solution

Solution:- (B) $$4$$
Four of the Balmer lines are in the technically visible part of the spectrum, with wavelengths between $$400 \; nm - 700 \; nm$$.
Question 6
1 / -0

The commonly used pain reliever, aspirin, has the molecular formula $$C_9H_8O_4.$$ If a sample of aspirin contains $$0.968\ g $$ of carbon, what is the mass of hydrogen in the sample?

A
$$0.717\ g$$

B
$$0.0717\ g$$

C
$$8.000\ g$$

D
$$0.645\ g$$

Solution

Molar mass of $$C_9H_8O_4=9 \times 12+8\times 1+4\times 16$$
$$=180$$ gram/mole
$$180$$ gram $$C_9H_8O_4 \equiv 108$$ gram carbon
$$\therefore x$$ gram $$C_9H_8O_4 \equiv 0.968$$ gram carbon
$$\therefore x=\dfrac{0.968 \times 180}{108}$$
$$= 1.613$$ gram $$C_9H_8O_4$$
Now
$$180$$ gram $$C_9H_8O_4\equiv 8$$ gram Hydrogen
$$\therefore 1.613$$ gram $$C_9H_8O_4 \equiv \dfrac{8\times
1.613}{180} $$
$$=0.0717$$ gram '$$H$$'
Option $$(b)$$ correct.
Question 7
1 / -0

When a mixture of aluminium powder and iron $$(III)$$ oxide is ignited, it produces molten iron and aluminium oxide. In an experiment, $$5.4\ g$$ of aluminium was mixed with $$18.5\ g$$ of iron $$(III)$$ oxide. At the end of the reaction, the mixture contained $$11.2\ g$$ of iron, $$10.2\ g$$ of aluminium of unreacted iron $$(III)$$ oxide. No aluminium was left. What is the mass of the iron $$(III)$$ oxide left?

A
$$2.5\ g$$

B
$$7.3\ g$$

C
$$8.3\ g$$

D
$$2.9\ g$$

Solution

$$Al+Fe_{2}O_{3}\rightarrow Fe+Al_{2}O_{3}$$
Mass of $$Al=5.4\ gm$$
Mass of $$Fe_{2}O_{3}=18.5\ gm$$
Mass of $$Fe=11.2\ gm$$
Mass of $$Al_{2}O_{3}=10.2\ gm$$
$$\therefore$$ Amount of unreacted $$Fe_{2}O_{3}$$
$$=(5.4+18.5)-(11.2+10.2)\ gm$$
$$=(23.9-21.4)\ gm$$
$$=2.5\ gm$$
Option $$a$$
Question 8
1 / -0

Which statement about a $$3$$p orbital is correct?

A
It can hold a maximum of $$6$$ electrons

B
It has the highest energy of the orbitals with principal quantum number $$3$$

C
It is at a higher energy level than a $$3$$s orbital but has the same shape

D
It is occupied by one electron in an isolated phosphorous atom

Solution

Solution:- (A) It can hold a maximum of $$6$$ electrons.
Any $$p$$ orbital can hold a maximum of $$6$$ electrons.
Hence statement $$\left( A \right)$$ is correct.
Question 9
1 / -0

What is the nucleos number of an atom?

A
The number of electrons, neutrons and protons in the nucleus

B
The number of neutrons and protons in the nucleus

C
The number of neutrons in the nucleus

D
The number of protons in the nucleus

Solution

Solution:- (B) The number of neutrons and protons in the nucleus
The nucleon number or mass number of an atom is the sum of number of neutrons and protons in the nucleus.
Question 10
1 / -0

If rocket were fuelled with kerosene and liquid oxygen, what mass of oxygen would be required for every liter of kerosene? Assume kerosene to have the average composition $$C_{14}H_{30}$$ and density, $$0.792\ g/ml$$.

A
$$5.504\ kg$$

B
$$2.752\ kg$$

C
$$1.376\ kg$$

D
$$3.475\ kg$$

Solution

$$d=\dfrac {m}{v}\quad v=1$$ litre $$=100\ ml$$
$$m=d\times v=0.792\ g\times 1000\ ml$$
$$=792$$ gram/mole
moles of kerosene $$=\dfrac {792}{M}$$
Molar mass $$=C_{14}H_{30}=14\times 12+30\times 1$$
$$=198$$
moles of kerosene $$=\dfrac {792}{198}$$
$$=4$$ moles
combusion of kerosene
$$2C_1H_{30}+43O_2\longrightarrow 28CO_+30H_2O$$
$$2$$ mole $$C_{14}H_{30}\equiv 43$$ mole $$O_2$$
$$4$$ mole $$C_{14}H_{30}\equiv =43\times 4=85$$ mo,e $$O_2$$
mass of $$O_{2}=86\times 32$$
$$=2752$$ gram
$$=2.752\ kg$$
$$\therefore $$ option $$"b"$$ correct

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Structure of Atom Test - 62

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Structure of Atom Test - 62

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Question 1

> 25

< 24

25

30

Solution

Question 2

$$Becquerel$$

$$Henry$$

$$Ohm$$

$$Mendel$$

Solution

Question 3

$$15.6\ g$$

$$5.2\ g$$

$$46.8\ g$$

$$7.8\ g$$

Solution

Question 4

$$100$$

$$50$$

$$15$$

$$8$$

Solution

Question 5

$$5$$

$$4$$

$$2$$

$$3$$

Solution

Question 6

$$0.717\ g$$

$$0.0717\ g$$

$$8.000\ g$$

$$0.645\ g$$

Solution

Question 7

$$2.5\ g$$

$$7.3\ g$$

$$8.3\ g$$

$$2.9\ g$$

Solution

Question 8

It can hold a maximum of $$6$$ electrons

It has the highest energy of the orbitals with principal quantum number $$3$$

It is at a higher energy level than a $$3$$s orbital but has the same shape

It is occupied by one electron in an isolated phosphorous atom

Solution

Question 9

The number of electrons, neutrons and protons in the nucleus

The number of neutrons and protons in the nucleus

The number of neutrons in the nucleus

The number of protons in the nucleus

Solution

Question 10

$$5.504\ kg$$

$$2.752\ kg$$

$$1.376\ kg$$

$$3.475\ kg$$

Solution

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