Home
School Exams
Scholarship Exams
OTI365 - NTSE - X Standard
NTSE SAT Chemistry - Atomic Structure Sample Question Paper

SAT Chemistry - Atomic Structure

Exam Duration: 45 Mins Total Questions : 30

1 )

The electronic configuration of an ion X^-2 is 2,8,8 If its mass number is 32, the number of protons neutrons and electrons are respectively

(a)
18, 14, 18
(b)
16,16,16
(c)
14,18,24
(d)
None of these

2 )

Which pair shows isobars?

(a)
\(_{ 1 }H^{ 1 }\) and \(\quad _{ 1 }H^{ 2 }\quad \quad \quad \)
(b)
\(_{ a }C^{ 14 }\) and \(_{ 7 }H^{ 14 }\quad \quad \quad \)
(c)
\(_{ 18 }Ar^{ 40 }\) and \(_{ 10 }K^{ 10 }\quad \quad \quad \)
(d)
both B and C

3 )

The neutral atom isoelectronic with Ca²⁺ is

(a)
Cl^-
(b)
k⁺
(c)
Ar
(d)
Kr

4 )

Radioactive isotope of carbon is

(a)
\(_{ 6 }C^{ 12 }\)
(b)
\(_{ 6 }C^{ 13 }\)
(c)
\(_{ 6 }C^{ 14 }\)
(d)
All of these

5 )

The unipositive ion of an element contains 8 electrons in its M shell. If its nucleus contains 20 neutrons what is the mass number of the element?

(a)
18
(b)
19
(c)
38
(d)
39

6 )

Charge and mass of \(\beta \) particles are respectively

(a)
-1 and 0
(b)
0 and -1
(c)
+2 and 4u
(d)
0 and 0

7 )

The mass of a proton is

(a)
1.00728 amu
(b)
1.673 x 10^-24gm
(c)
1.673 x 10^-27 kg
(d)
all of these

8 )

Which of the following has the same number of protons, electrons & neutrons

(a)
\(_{27}^{54}X\)
(b)
\(_{27}^{54}X\)⁺¹
(c)
\(_{26}^{54}X\)
(d)
\(_{28}^{54}X\)

9 )

Many element have non - integral masses because

(a)
they have isobars
(b)
their isotopes have non - integral masses.
(c)
they have isotopes.
(d)
the constituents neutrons, protons & electrons combine to give fractional masses.

10 )

Members of which of the following have similar chemical properties?

(a)
Isotopes
(b)
Isobars
(c)
Allotropes
(d)
Both isotopes & allotropes

11 )

The number of electrons in the L- shell of phosphorus is not equal to that in the

(a)
L - shell of neon
(b)
M - shell of potassium
(c)
M - shell of chromium
(d)
M - shell of argon

12 )

The electronic configuration of sodium is

(a)
2, 8, 1
(b)
2, 6
(c)
2, 8, 2
(d)
2, 2

13 )

The element with the same atomic number and mass number is

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

14 )

Neutrons were discovered by

(a)
Joseph Thomson
(b)
James Chadwick
(c)
Ernest Rutherford
(d)
John Dalton

15 )

The mass number of an element is denoted by

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

16 )

Total number of electron in an atom of phosphorous is

(a)
9
(b)
15
(c)
16
(d)
17

17 )

The electronic configuration of Silicon is

(a)
2,4
(b)
2,8,4
(c)
2,8,1
(d)
2,8,5

18 )

When chlorine atom becomes chloride ion it

(a)
Loses an electron
(b)
Gain an electron
(c)
Does not loose or gain
(d)
Share electron

19 )

An atom that becomes charged by gaining or loosing an electron is called

(a)
Cation
(b)
Anion
(c)
Ion
(d)
Electron

20 )

The valency of chloride radical in FeCl₃ is

(a)
3
(b)
4
(c)
1
(d)
2

21 )

Which one of the following is the largest in size?

(a)
Atom
(b)
Electron
(c)
Proton
(d)
Neutron

22 )

Which one of the following is NOT isoelectronic with an atom of neon?

(a)
₈O^2-
(b)
₁₁Na⁺
(c)
₉F^-
(d)
₁₂Mg⁺

23 )

The symbol for an atom of naturally occurring sodium is sometimes given as \(\begin{matrix} 23 \\ 11 \end{matrix}Na\) such a sodium atom contains

(a)
11 protons and 12 neutrons.
(b)
11 electrons and 11 protons
(c)
11 electrons and 12 neutrons.
(d)
11 protons and 12 electrons.

24 )

Naturally occurring bromine has a relative atomic mass of 80 and consists entirely of two isotopes of relative isotopic masses of 79 and 81. It can be deduced that naturally occurring bromine