

NTSE SAT Chemistry - Atomic Structure
Exam Duration: 45 Mins Total Questions : 30
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
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
Which of the following will have equal number of electrons?
(i)O-2 and 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
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
Number of electrons in \(\alpha \) particles are
- (a)
4
- (b)
1
- (c)
2
- (d)
0
How many electrons are present in L shell of chlorine' atom?
- (a)
2
- (b)
8
- (c)
7
- (d)
none of these
Nucleus was discovered by
- (a)
J.J. Thomson
- (b)
Neils Bohr
- (c)
Chadwick
- (d)
Rutherford
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
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
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
Rutherford performed his alpha scattering experiment using
- (a)
silver
- (b)
gold
- (c)
mercury
- (d)
diamond
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
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
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
The mass of proton is the same as that of
- (a)
Carbon atom
- (b)
An electron
- (c)
Hydrogen ion
- (d)
Oxygen atom
The isotopes possess
- (a)
Similar physical properties
- (b)
Similar chemical properties
- (c)
Different physical properties
- (d)
Different chemical properties
\(_{ 1 }{ H, }_{ 1 }^{ 2 }{ H },_{ 1 }^{ 3 }{ H }\) are the ............... of hydrogen.
- (a)
Isotope
- (b)
Isobar
- (c)
Both isotope and isobars
- (d)
Allotropes
Carbon has three isotopes, whose mass numbers are
- (a)
11, 12, 13
- (b)
12, 13, 14
- (c)
14, 15, 16
- (d)
6, 7, 8
The element with the same atomic number and mass number is
- (a)
Oxygen
- (b)
Hydrogen
- (c)
Helium
- (d)
Carbon
The mass of an electron is
- (a)
1837 times the mass of proton
- (b)
1/1837th times the mass of oxygen atom
- (c)
1/1837th times the mass of carbon atom
- (d)
1/1837th times the mass of hydrogen atom.
Atomic number of an element is denoted by
- (a)
X
- (b)
A
- (c)
Z
- (d)
N
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
A oxygen atom has.......... protons, ............... electrons and .......... neutrons
- (a)
8, 7, 8
- (b)
8, 8, 8
- (c)
8, 9,10
- (d)
8, 6, 7
Sulphur exhibits the valency
- (a)
2,4
- (b)
3,5
- (c)
2,4,6
- (d)
1,2
The positively charge ion is called
- (a)
Cation
- (b)
Anion
- (c)
Ion
- (d)
None of these
The number of proton present in fluorine atom is
- (a)
7
- (b)
10
- (c)
9
- (d)
8
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
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
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
- (a)
(i) and (iii)
- (b)
(i) and (iii)
- (c)
(ii) and (iii)
- (d)
(ii) and (iv)
An atom with 3 protons and 4 neutrons will have a valency of
- (a)
3
- (b)
7
- (c)
1
- (d)
4