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NEET Exam  >  NEET Tests  >  Chemistry Class 12  >  Test: p-Block Elements - 1 - NEET MCQ

Test: p-Block Elements - 1 - NEET MCQ


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25 Questions MCQ Test Chemistry Class 12 - Test: p-Block Elements - 1

Test: p-Block Elements - 1 for NEET 2024 is part of Chemistry Class 12 preparation. The Test: p-Block Elements - 1 questions and answers have been prepared according to the NEET exam syllabus.The Test: p-Block Elements - 1 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: p-Block Elements - 1 below.
Solutions of Test: p-Block Elements - 1 questions in English are available as part of our Chemistry Class 12 for NEET & Test: p-Block Elements - 1 solutions in Hindi for Chemistry Class 12 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Test: p-Block Elements - 1 | 25 questions in 35 minutes | Mock test for NEET preparation | Free important questions MCQ to study Chemistry Class 12 for NEET Exam | Download free PDF with solutions
Test: p-Block Elements - 1 - Question 1
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Which among the following compound, nitrogen shows the oxidation state of +5?

Detailed Solution for Test: p-Block Elements - 1 - Question 1

N has +5 in HNO3. Oxidation state of O is -2 and H is +1.​

Test: p-Block Elements - 1 - Question 2
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Which among the following forms basic oxide?

Detailed Solution for Test: p-Block Elements - 1 - Question 2

As we move down the group metallic character increases so Bi is a metal thus its oxide is basic.

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Test: p-Block Elements - 1 - Question 3
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In laboratory ammonia is prepared by heating

Detailed Solution for Test: p-Block Elements - 1 - Question 3

2(NH4Cl) + Ca(OH)2 → (CaCl)2 + 2(NH3) + 2(H2O)
Hence C is correct.

Test: p-Block Elements - 1 - Question 4
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Ammonia has a higher boiling point and is less volatile because of
Detailed Solution for Test: p-Block Elements - 1 - Question 4

NH3 undergo intermolecular hydrogen bonding and therefore it has higher boiling point compared to other hydrides of group 15.

Test: p-Block Elements - 1 - Question 5
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Which compound is used as the cooling liquid in refrigerators?
Detailed Solution for Test: p-Block Elements - 1 - Question 5

NH3  is used as cooling liquid in refrigerators.

Test: p-Block Elements - 1 - Question 6
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At what temperature white phosphorous changes to red phosphorous?
Detailed Solution for Test: p-Block Elements - 1 - Question 6

White phosphorus when heated to 300° C polymerization occurs and it changes to Red Phosphorus.

Test: p-Block Elements - 1 - Question 7
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  is the structure of
Detailed Solution for Test: p-Block Elements - 1 - Question 7

H3PO2  is Hypophosphorus acid

Test: p-Block Elements - 1 - Question 8
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Elements of which group are known as ore forming elements?
Detailed Solution for Test: p-Block Elements - 1 - Question 8

Maximum ores are of group 16 elemnts (O, S etc).

Test: p-Block Elements - 1 - Question 9
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Most metal oxides are
Detailed Solution for Test: p-Block Elements - 1 - Question 9

Most metal oxides are ionic crystals with high melting and boiling points. They are compounds that contain at least one metal and one oxygen atom, and are generally basic in nature. Metal oxides are basic because they react with acids to form salt and water, neutralizing the acids. 

Test: p-Block Elements - 1 - Question 10
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The stability of hydrides of group 16 elements decreases in the order
Detailed Solution for Test: p-Block Elements - 1 - Question 10

As we move down the group bond length increases therefore stability of hydrides decreases. Order of bond length O-H < S-H < Se-H < Te-H.

Test: p-Block Elements - 1 - Question 11
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Formula of oleum is
Detailed Solution for Test: p-Block Elements - 1 - Question 11

Oleum is H2S2O7

Test: p-Block Elements - 1 - Question 12
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Which among the following does not exhibit positive oxidation state?
Detailed Solution for Test: p-Block Elements - 1 - Question 12

Fluorine is most electronegative element therefore can only gain electrons. Thus it only shows negative oxidation state.

Test: p-Block Elements - 1 - Question 13
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Which of the following is the strongest Lewis base?
Detailed Solution for Test: p-Block Elements - 1 - Question 13

Correct Answer :- D

  • Lewis bases need to be able to donate electrons. Fluorine is the most electronegative element in the halogens followed by chlorine, bromine and iodine. 
  • Due to fluorine being strongly electronegative, it draws the electron density towards itself which makes it difficult for nitrogen atom to donate its lone pair of electrons. So, NF is the least basic. This trend follows the strength of electronegativity of the halides. 
  • Since iodine is least electronegative, it is the most basic trihalide of nitrogen.

So, we have the trend, in decreasing order of basic strength:

NF3 < NCl3 < NBr3 < NI3

Test: p-Block Elements - 1 - Question 14
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Hydrogen sulphide reacts with lead acetate forming a black compound which reacts with hydrogen peroxide to form another compound. The colour of the compound is
Detailed Solution for Test: p-Block Elements - 1 - Question 14

PbS + H2O2 → PbSo4(white) + H2O

Test: p-Block Elements - 1 - Question 15
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Which of the following is thermally the most stable?
Detailed Solution for Test: p-Block Elements - 1 - Question 15

 

Stability of hydrides decreases down the group so most stable is H2O  

Test: p-Block Elements - 1 - Question 16
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Which of the following is prepared by cyanamide process?
Detailed Solution for Test: p-Block Elements - 1 - Question 16

CaNCN + 3H2O → CaCO3 + 2NH3

Test: p-Block Elements - 1 - Question 17
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Ozone can be detected by using
Detailed Solution for Test: p-Block Elements - 1 - Question 17

Ozone is detected by using Hg.

Test: p-Block Elements - 1 - Question 18
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Which of the following oxides reacts with both HCl and NaOH?
Detailed Solution for Test: p-Block Elements - 1 - Question 18

ZnO is an amphroteric oxide.

Test: p-Block Elements - 1 - Question 19
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Name the gas whose formula was established by Sorret?
Detailed Solution for Test: p-Block Elements - 1 - Question 19

Sorret established formula of ozone.

Test: p-Block Elements - 1 - Question 20
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Which colour is given by CuSO4 with ammonia?
Detailed Solution for Test: p-Block Elements - 1 - Question 20

Cu2+  + 4NH3 → [Cu (NH3)4]2+ (blue)

Test: p-Block Elements - 1 - Question 21
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Xenondifluoride is
Detailed Solution for Test: p-Block Elements - 1 - Question 21

CN = 0.5(V+M-C+A) For XeF2 CN = 5 so shape will be linear and structure will be trigonal pyramidal.

Test: p-Block Elements - 1 - Question 22
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A metal X on heating in nitrogen gas gives Y. Y on treatment with water gives a colourless gas which when passed through copper sulphate solution gives a blue colour. Y is
Detailed Solution for Test: p-Block Elements - 1 - Question 22

Mg3N2 reacts with water to evolve NH3. Which reacts with copper ion to form blue color complex.

Test: p-Block Elements - 1 - Question 23
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The reagent used to distinguish between H2O2 and O3 is:
Detailed Solution for Test: p-Block Elements - 1 - Question 23

H2O2 can decolorize the color of KMnO4

Test: p-Block Elements - 1 - Question 24
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When chlorine is passed through concentrated hot solution of KOH, the compound formed is
Detailed Solution for Test: p-Block Elements - 1 - Question 24

 

Cl2 on treatment with conc. Base form ClO3-

Test: p-Block Elements - 1 - Question 25
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Ammonia can be dried using
Detailed Solution for Test: p-Block Elements - 1 - Question 25

CaO is used to dry NH3

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