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OTI365 - NTSE - X Standard
NTSE SAT Chemistry - Atomic Structure Sample Questions

NTSE SAT Chemistry - Atomic Structure

Exam Duration: 45 Mins Total Questions : 30

1 )

Identify the correct statement/so

(a)
\(\alpha \) - -particles when combine with two electrons yield Helium gas.
(b)
\(\beta \) -rays are negatively charged particles.
(c)
\(\gamma \) rays are high energy radiations like X-rays
(d)
All of the above

2 )

The number of protons, neutrons and electrons in \(_{ 35 }Br^{ 80 }\) are respectively

(a)
35,45,35
(b)
35,35,45
(c)
35,35,80
(d)
35,80,35

3 )

Which of the following will have equal number of electrons?
(i)O^-2and F^- (ii) Na⁺and Mg²⁺
(iii) Ar and K⁺ (iv) Cl and Ar

(a)
i and ii
(b)
ii and iii
(c)
i, ii and iii
(d)
i,ii,iii and iv

4 )

An electron of an atom of sodium moves from its valence shell to K shell. It will

(a)
absorb energy
(b)
release energy
(c)
neither absorb nor release energy
(d)
none of the above

5 )

Number of electrons in \(\alpha \) particles are

(a)
4
(b)
1
(c)
2
(d)
0

6 )

How many electrons are present in L shell of chlorine' atom?

(a)
2
(b)
8
(c)
7
(d)
none of these

7 )

Nucleus was discovered by

(a)
J.J. Thomson
(b)
Neils Bohr
(c)
Chadwick
(d)
Rutherford

8 )

Which of the following represents the electronic configuration of an inert gas?

(a)
2,8,8,1
(b)
2,8,18,8
(c)
2, 8, 2
(d)
2, 1

9 )

Number of electrons present in protium and deuterium are respectively

(a)
1 and 1
(b)
0 and 1
(c)
1 and 0
(d)
1 and 2

10 )

Which pair shows isotones?

(a)
\(_{ 1 }H^{ 2 }\) and \(_{ 1 }H^{ 3 }\quad \)
(b)
\(_{ 6 }C^{ 14 }\) and \(_{ 7 }N^{ 14 }\quad \)
(c)
\(_{ 14 }Si^{ 30 }\) and \(_{ 15 }P^{ 31 }\quad \)
(d)
₁₇Cl³⁵ and ₁₇Cl³⁷

11 )

Rutherford performed his alpha scattering experiment using

(a)
silver
(b)
gold
(c)
mercury
(d)
diamond

12 )

Pick out the isoelectronic structures from the following
(I)CH3⁺ (II) Hp⁺
(III) NH³ (IV) CH₃^-

(a)
I and II
(b)
IlI and IV
(c)
I and III
(d)
II, III, IV

13 )

The electronic configuration of Mn⁺² is -

(a)
2,8, 13
(b)
2,8, 11,2
(c)
2,8,13,2
(d)
None of these

14 )

Entire positive charge in an atom is concentrated in a small area as its centre called nucleus.This was suggested by

(a)
Thomson
(b)
Rutherford
(c)
Bohr
(d)
Dalton

15 )

The mass of proton is the same as that of

(a)
Carbon atom
(b)
An electron
(c)
Hydrogen ion
(d)
Oxygen atom

16 )

The isotopes possess

(a)
Similar physical properties
(b)
Similar chemical properties
(c)
Different physical properties
(d)
Different chemical properties

17 )

\(_{ 1 }{ H, }_{ 1 }^{ 2 }{ H },_{ 1 }^{ 3 }{ H }\) are the ............... of hydrogen.

(a)
Isotope
(b)
Isobar
(c)
Both isotope and isobars
(d)
Allotropes

18 )

Carbon has three isotopes, whose mass numbers are

(a)
11, 12, 13
(b)
12, 13, 14
(c)
14, 15, 16
(d)
6, 7, 8

19 )

The element with the same atomic number and mass number is

(a)
Oxygen
(b)
Hydrogen
(c)
Helium
(d)
Carbon

20 )

The mass of an electron is

(a)
1837 times the mass of proton
(b)
1/1837^th times the mass of oxygen atom
(c)
1/1837^thtimes the mass of carbon atom
(d)
1/1837^th times the mass of hydrogen atom.

21 )

Atomic number of an element is denoted by

(a)
X
(b)
A
(c)
Z
(d)
N

22 )

In a neutral atom, the number of protons is equal to

(a)
Number of electrons
(b)
Half the number of electrons
(c)
Number of neutrons
(d)
Number of electrons and neutrons

23 )

A oxygen atom has.......... protons, ............... electrons and .......... neutrons

(a)
8, 7, 8
(b)
8, 8, 8
(c)
8, 9,10
(d)
8, 6, 7

24 )

Sulphur exhibits the valency

(a)
2,4
(b)
3,5
(c)
2,4,6
(d)
1,2

25 )

The positively charge ion is called

(a)
Cation
(b)
Anion
(c)
Ion
(d)
None of these

26 )

The number of proton present in fluorine atom is

(a)
7
(b)
10
(c)
9
(d)
8

27 )

Two particles 'X' and 'Y' have the following composition:

	Electrons	Neutrons	Protons
X	4	6	5
Y	6	4	5

It follows that X and Y

(a)
are both positively charged.
(b)
have the same mass number
(c)
are particles of the same element
(d)
have different atomic numbers

28 )

Which of the following correctly represent the electronic distribution in the Mg atom?

(a)
3, 8, 1
(b)
2, 8, 2
(c)
1, 8,3
(d)
8, 2, 2

29 )

Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons