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OTI365 - NTSE - X Standard
NTSE SAT Chemistry - Classification of Elements Important Questions with Answer

NTSE SAT Chemistry - Classification of Elements

Exam Duration: 45 Mins Total Questions : 30

1 )

Which one of the following elements exhibits maximum number of valence electrons?

(a)
Na
(b)
Al
(c)
Si
(d)
P

2 )

Which of the following gives the correct increasing order of the atomic radii of 0, F and N?

(a)
O, F, N
(b)
N, F, O
(c)
O, N, F
(d)
F, O, N

3 )

Which among the following elements has the largest atomic radii?

(a)
Na
(b)
Mg
(c)
K
(d)
Ca

4 )

Which of the following elements does not lose an electron easily?

(a)
Na
(b)
F
(c)
Mg
(d)
Al

5 )

Which of the following are the characteristics of isotopes of an element?
I. Isotopes of an element have same atomic masses.
II. Isotopes of an element have same atomic number.
III. Isotopes of an element show same physical properties.
IV. Isotopes of an element show same chemical properties.

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

6 )

Arrange the following elements in the order of their decreasing metallic character: Na, Si, CI, Mg, AI

(a)
CI > Si > AI> Mg > Na
(b)
Na > Mg > AI > Si > CI
(c)
Na > AI > Mg > CI > Si
(d)
AI > Na > Si > Ca > Mg

7 )

Arrange the following elements in the order of their increasing non-metallic character: Li, O, C, Be, F

(a)
F < O< C < Be < Li
(b)
Li < Be < C < 0< F
(c)
F < O< C < Be < Li
(d)
F < O< Be < C < Li

8 )

Which of the following elements will form an acidic oxide?

(a)
An element with atomic number 7
(b)
An element with atomic number 3
(c)
An element with atomic number 12
(d)
An element with atomic number 19

9 )

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element be?

(a)
Metal
(b)
Metalloid
(c)
Non-metal
(d)
Left-hand side element

10 )

Which one of the following depicts the correct representation of atomic radius(r) of an atom?

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

11 )

On moving from left to right in a period in the periodic table, the size of the atom:

(a)
increase
(b)
decrease
(c)
does not change appreciably
(d)
first decreases and then increases

12 )

Which of the following set of elements is written in order of their increasing metallic character?

(a)
Be, Mg, Ca
(b)
Na, Li, K
(c)
Mg, Al, Si
(d)
C, O, N

13 )

In Mendeleev's Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later:

(a)
Germanium
(b)
Chlorine
(c)
Oxygen
(d)
Silicon

14 )

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group?

(a)
A and B
(b)
B and D
(c)
A and C
(d)
D and E

15 )

The property of an element in the periodic table depends on its, _____________

(a)
atomic size
(b)
atomic mass
(c)
electronic configuration
(d)
number of protons

16 )

The number of electrons in the valence shell is equal to its _____________

(a)
atomic mass
(b)
group number
(c)
period number
(d)
atomic number

17 )

The non-metallic element present in the third period other than sulphur and chlorine is __________

(a)
oxygen
(b)
fluorine
(c)
nitrogen
(d)
phosphorus

18 )

At the end of each period, the valence shell is _____________

(a)
incomplete
(b)
half filled
(c)
singly occupied
(d)
completely filled

19 )

The family of elements having seven electrons in the outermost shell is ____________

(a)
alkali metals
(b)
alkaline earth metals
(c)
halogens
(d)
noble gases

20 )

Which of the following factors does not affect the metallic character of an element?

(a)
Atomic size
(b)
Ionisation potential
(c)
Electro negativity
(d)
Atomic radius

21 )

The modern periodic table is given by ____________

(a)
Mendeleev
(b)
Einstein
(c)
Bohr
(d)
Mosley

22 )

Elements belonging to groups 1 to 17 are called _____________

(a)
noble gases
(b)
normal elements
(c)
transition elements
(d)
inner transition elements

23 )

A liquid non-metal is ____________

(a)
phosphorous
(b)
mercury
(c)
bromine
(d)
nitrogen

24 )

The first alkali metal is ____________

(a)
hydrogen
(b)
lithium
(c)
sodium
(d)
francium

25 )

A purple coloured solid halogen is ___________

(a)
chlorine
(b)
bromine
(c)
iodine
(d)
astatine

26 )

The family of elements to which calcium belongs is ____________

(a)
alkali metals
(b)
alkaline earth metals
(c)
halogens
(d)
noble gases

27 )

The valency of chlorine with respect to oxygen is _____________

(a)
1
(b)
3
(c)
5
(d)
7

28 )

Six elements A, B, C, D, E and F have the following atomic numbers (A = 12;B = 17, C = 18,D = 7, E = 9 and F = 11). Among these elements, the element, which belongs to the 3rd period and has the highest ionisation potential, is __________ .