Classification of Elements and Periodicity in Properties — DPP 2

20 NEET questions from Classification of Elements and Periodicity in Properties, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Among the following the Dobereiner triads is:
  1. A $\mathrm { Na } , \mathrm { K }$ and Rb
  2. B $\mathrm { Mg } , \mathrm { S }$ and As
  3. C $\mathrm { Cl } , \mathrm { Br }$ and I
  4. D P, S and As
Show answer

Correct answer: C

2
The third period of periodic table contains:
  1. A 8 elements
  2. B 32 elements
  3. C 3 elements
  4. D 18 elements
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Correct answer: A

3
Which of the following sets contain only isoelectronic ions?
  1. A $\mathrm { Zn } ^ { 2 + } , \mathrm { Ca } ^ { + } , \mathrm { Ga } ^ { 3 + } , \mathrm { Al } ^ { 3 + }$
  2. B $\mathrm { K } ^ { + } , \mathrm { Ca } ^ { 2 + } , \mathrm { Sc } ^ { + } , \mathrm { Cl } ^ { - }$
  3. C $\mathrm { P } ^ { 3 - } , \mathrm { S } ^ { 2 - } , \mathrm { Cl } ^ { - } , \mathrm { K } ^ { + }$
  4. D $\mathrm { Ti } ^ { 4 + } , \mathrm { Ar } , \mathrm { Cr } ^ { 3 + } , \mathrm { V } ^ { 5 + }$
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Correct answer: C

4
Which of the following electronic configuration is of transition elements?
  1. A 1s$^ { 2 }$ 2s$^ { 2 }$ 2p$^ { 6 }$ 3s$^ { 2 }$ 3p$^ { 6 }$ 4s$^ { 2 }$
  2. B 1 s$^ { 2 }$ 2 s$^ { 2 }$ 2 p$^ { 6 }$ 3 s$^ { 2 }$ 3p$^ { 6 }$ 3d$^{ 10 }$ 4s$^{ 2 }$ 4p$^ { 1 }$
  3. C 1s$^ { 2 }$ 2s$^ { 2 }$ 2p$^ { 6 }$ 3s$^ { 2 }$ 3p$^ { 6 }$ 3d$^ { 10 }$ 4s$^ { 2 }$ 4p$^ { 6 }$
  4. D $1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 3 d ^ { 2 } 4 s ^ { 2 }$
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Correct answer: D

5
In a group of the periodic table the ionisation enthalpies of the elements decreases from top to bottom because of......
  1. A increase in densities.
  2. B decrease in chemical reactivities.
  3. C increase in atomic sizes.
  4. D decrease in electronegativities.
Show answer & explanation

Correct answer: C

In a group of the periodic table, the ionisation enthalpies of the elements decreases from top to bottom because of increase in atomic size.
Therefore, option (3) is the correct answer.
6
Which oxide is neutral?
  1. A $\mathrm { CO } _ { 2 }$
  2. B $\mathrm { SO } _ { 2 }$
  3. C NO
  4. D $\mathrm { P } _ { 2 } \mathrm { O } _ { 5 }$
Show answer

Correct answer: C

7
An element of atomic number 29 belongs to:
  1. A s block
  2. B p block
  3. C d block
  4. D f block
Show answer

Correct answer: C

8
Directions: These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions, you are required to choose any one of the following four responses.

Assertion (A): Electron gain enthalpy generally becomes less negative as we go down a group.
Reason (R): Size of an atom increases on going down the group and the added electron would be farther from the nucleus.
  1. A If both Assertion (A) and Reason (R) are True and the Reason (R) is a correct explanation of the Assertion (A).
  2. B If both Assertion (A) and Reason (R) are True but Reason (R) is not a correct explanation of the Assertion (A).
  3. C If Assertion (A) is True but the Reason (R) is False
  4. D Assertion (A) is False but Reason (R) is True.
Show answer

Correct answer: A

9
In groups moving top to down the atomic density:
  1. A decreases.
  2. B remains the same.
  3. C can't be said.
  4. D generally increases.
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Correct answer: D

10
Match the List-I with List-II to fid out the correct option.
Classification of Elements and Periodicity in Properties – NEET-10444
  1. A A-(Q), B-(R), C-(P), D-(S)
  2. B A-(P), B-(S), C-(Q), D-(R)
  3. C A-(R), B-(P), C-(S), D-(Q)
  4. D A-(Q), B-(P), C-(S), D-(R)
Show answer

Correct answer: D

11
Without looking at the periodic table, select from each of the following list, the elements belonging to the same group.
  1. A Z = 12, 38, 4
  2. B Z = 9, 16, 3
  3. C Z = 5, 11, 19
  4. D Z = 24, 47, 42
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Correct answer: A

12
Atomic number of Ag is 47. In the same group, the atomic numbers of elements placed above and below Ag in long form of periodic table will be:
  1. A 29 and 65
  2. B 39 and 79
  3. C 29 and 79
  4. D 39 and 65
Show answer

Correct answer: C

13
The plot of square root of frequency of X-rays emitted against atomic number led to the suggestion of which law/rule?
  1. A Mendleev's periodic law
  2. B Modern periodic law
  3. C Hund's rule
  4. D Newland's law of octaves
Show answer

Correct answer: B

14
The elements of group 16 are called $\_\_\_\_$ .
  1. A noble gases
  2. B chalcogens
  3. C halogens
  4. D alkali metals
Show answer & explanation

Correct answer: B

The elements of group 16 are called chalcogens.
Therefore, option (2) is the correct answer.
15
Find the total number of d block elements in the following atomic numbers? $48,28,70,100,55,45,34$ and $36$
  1. A 5
  2. B 3
  3. C 6
  4. D 2
Show answer

Correct answer: B

16
Match the List-I with List-II to fid out the correct option.
Classification of Elements and Periodicity in Properties – NEET-10443
  1. A A-(R), B-(S), C-(Q), D-(P)
  2. B A-(S), B-(R), C-(P), D-(Q)
  3. C A-(P), B-(Q), C-(S), D-(R)
  4. D A-(Q), B-(P), C-(R), D-(S)
Show answer

Correct answer: B

17
The elements which occupy the peaks of ionisation enthalpy curve are:
  1. A Na, K, Rb and Cs
  2. B Na, Mg, Cl and I
  3. C Cl, Br, I and F
  4. D He, Ne, Ar and Kr
Show answer

Correct answer: D

18
The element Californium belongs to the family of:
  1. A actinoids series
  2. B alkali metals
  3. C lanthanoid series
  4. D alkali earth metals
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Correct answer: A

19
The smallest ion among the following is
  1. A $\mathrm { Na } ^ { + }$
  2. B $\mathrm { Al } ^ { 3 + }$
  3. C $\mathrm { Mg } ^ { 2 + }$
  4. D $\mathrm { Si } ^ { 4 + }$
Show answer & explanation

Correct answer: D

Among the given isoelectronic ions, Si$^{4+}$ has the smallest size due to maximum nuclear charge.
Therefore, option (4) is the correct answer
20
To which block ${ } _ { 30 } \mathrm { Zn }$ belongs?
  1. A s
  2. B p
  3. C d
  4. D f
Show answer

Correct answer: C

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