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Test: p-Block Elements - 1


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

Test: p-Block Elements - 1 for NEET 2023 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 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: p-Block Elements - 1 below.
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Test: p-Block Elements - 1 - Question 1

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

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.

Test: p-Block Elements - 1 - Question 3

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

Ammonia has a higher boiling point and is less volatile because of

Detailed Solution for Test: p-Block Elements - 1 - Question 4

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

Test: p-Block Elements - 1 - Question 5

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

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

  is the structure of

Detailed Solution for Test: p-Block Elements - 1 - Question 7

H3PO is Hypophosphorus acid

Test: p-Block Elements - 1 - Question 8

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

Most metal oxides are

Detailed Solution for Test: p-Block Elements - 1 - Question 9

Metal oxides are basic and ionic in nature.

Test: p-Block Elements - 1 - Question 10

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

Formula of oleum is

Detailed Solution for Test: p-Block Elements - 1 - Question 11

Oleum is H2S2O7

Test: p-Block Elements - 1 - Question 12

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

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

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

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

Which of the following is prepared by cyanamide process?

Detailed Solution for Test: p-Block Elements - 1 - Question 16

CaNCN + 3H2O → CaCO+ 2NH3

Test: p-Block Elements - 1 - Question 17

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

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

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

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

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

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

Mg3Nreacts with water to evolve NH3. Which reacts with copper ion to form blue color complex.

Test: p-Block Elements - 1 - Question 23

The reagent used to distinguish between H2O2 and Ois:

Detailed Solution for Test: p-Block Elements - 1 - Question 23

H2Ocan decolorize the color of KMnO4

Test: p-Block Elements - 1 - Question 24

When chlorine is passed through concentrated hot solution of KOH, the compound formed is

Detailed Solution for Test: p-Block Elements - 1 - Question 24

 

Clon treatment with conc. Base form ClO3-

Test: p-Block Elements - 1 - Question 25

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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