Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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31.

An excess of AgNO3 is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitate would be

  • 0.001

  • 0.002

  • 0.003

  • 0.003


A.

0.001

The formula of dichlorotetraqua chromium (III) chloride is [Cr(H2O)Cl2]Cl.
On ionisation it generates only one Cl- ion.
[Cr(H2O)4Cl2]Cl --> [Cr(H2O)Cl2]+ +Cl-

Initial  100x0.01         0                 0

after ionisation
         0                   1 mol           1 mol
One mole of Cl- ions reacts with only 1 mole of AgNO3 molecules to produce 1 mole of AgCl.
therefore, 1 mmol or 1 x 10-3 mole reacts with AgNO3 to give AgCl.

= 1 x 1 x 10-3/1 = 0.001 mol AgCl
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32.

KMnO4 can be prepared from K2MnO4 as per reaction
3 MnO subscript 4 superscript 2 minus end superscript space plus 2 straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon 2 MnO subscript 4 superscript minus space plus MnO subscript 2 space plus 4 OH to the power of minus
The reaction can go to completion by removing OH- ions by adding

  • HCl

  • KOH

  • CO2

  • CO2

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33.

Which of the following statements about the interstitial compounds is incorrect?

  • They retain metallic conductivity

  • They are chemically reactive

  • They are much harder than the pure metal

  • They are much harder than the pure metal

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34.

Which one of the following molecules contains no pi -bond?

  • CO2

  • H2O

  • SO2

  • SO2

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35.

Which of the following is a polar molecule?

  • BF3

  • SF4

  • SiF4

  • SiF4

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36.

The reaction by which benzaldehyde cannot be prepared? 

  •  +CrO2Cl2 and CS2 followed by H3O+
  •  +H2 in presence of anhydrous AlCl3.
  •  +CO +HCl in presence of anhydrous AlCl3
  •  +CO +HCl in presence of anhydrous AlCl3
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37.

Which of these is not a monomer for high molecular mass silicone polymer?

  • MeSiCl3

  • Me2SiCl2

  • Me3SiCl

  • Me3SiCl

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38.

Antiseptics and disinfectants either kill or prevent the growth of microorganisms. Identify which of the following is not true.

  • A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant

  • Chlorine and iodine are used as strong disinfectants

  • Dilute solutions of boric acid and hydrogen, peroxide are strong antiseptics

  • Dilute solutions of boric acid and hydrogen, peroxide are strong antiseptics

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39.

Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI?

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40.

Nylon  is an example of 

  • Polyester

  • Polysaccharide

  • polyamide

  • polyamide

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