Answer the following questions: What is the effect of temperatu

Subject

Chemistry

Class

ICSE Class 12

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Sample Papers

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 Multiple Choice QuestionsMatch The Following

1.

Match the following:

A. Disaccharide (i) Lucas reagent
B. Carbylamine (ii) Condensation polymer
C. Dacron (iii)  Obnoxious smell
D. Dacron (iv) Sucrose
E. Anhydrous ZnCl2 + conc. HCl (v) Hexaamminecobalt(III)ion
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 Multiple Choice QuestionsFill In the Blanks

2.

Fill in the blanks by choosing the appropriate word/words from those given in the
brackets:
(increases, decreases, positive, efficient, 68, non-efficient, no α-hydrogen, α-hydrogen,
negative, Rosenmund’s, greater, Cannizzaro, 74, common-ion effect, lesser, buffer
action, diamagnetic, paramagnetic)

(i) The more__________ the standard reduction potential of a metal, the ________ is
its ability to displace hydrogen from acids.

(ii) Both ccp and hcp are ____________ packings and occupy about _________% of
the available space.

(iii) Solubility of silver chloride _____________ in the presence of sodium chloride
because of _____________.

(iv) Benzaldehyde undergoes ___________ reaction on treatment with concentrated
sodium hydroxide because it has ___________ atom.

(v) The transition metals show ______________ character because of the presence of
unpaired electrons and Cu+ is _____________because its electronic configuration
is [Ar]3d10.

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 Multiple Choice QuestionsMultiple Choice Questions

3.

Complete the following statements by selecting the correct alternative from the choices given:

The molal freezing point constant of water is 1·86 K kg mol-1 . Therefore, the freezing point of 0·1M NaCl solution in water is expected to be:

  • -1·86oC

  • -0·372oC

  • -0·186oC

  • -0·186oC

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4.

Complete the following statements by selecting the correct alternative from the
choices given:

For a first order reaction the rate constant for decomposition of N2O5 is 6×10-4sec-1.
The half-life period for the decomposition in seconds is:

  • 11·55

  • 115·5

  • 1155

  • 1155

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5.

Complete the following statements by selecting the correct alternative from the
choices given:

When acetaldehyde is treated with Grignard reagent, followed by hydrolysis the
product formed is:

  • Primary alcohol

  • Secondary alcohol

  • Carboxylic acid

  • Carboxylic acid

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6.

Complete the following statements by selecting the correct alternative from the choices given:

 The geometry of XeF6 molecule and the hybridization of Xe atom in the molecule is:

  • Distorted octahedral and sp3d3

  • Square planar and sp3d2

  • Pyramidal and sp3

  • Pyramidal and sp3

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7.

Complete the following statements by selecting the correct alternative from the
choices given:

In the complexes [Fe(CN)6]3- and [Pt(en) (H2O)2(NO2)(Cl)]2+ the respective
oxidation numbers of central metal atoms are :

  • + 3 and +4

  • +6 and +4

  • +6 and +3

  • +6 and +3

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 Multiple Choice QuestionsShort Answer Type

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8.

Answer the following questions: 
What is the effect of temperature on the ionic product of water? How will it change the pH value of a neutral solution?


The Ionic product increases with increase in temperature because the dissociation of water increases with the increase of temperature. With the increase in the concentration of H3O+ ions, pH of the neutral solution will decrease.

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9.

Answer the following questions: 

How many hours does it take to reduce 3 moles of Fe3+to Fe2+ with 2·0 A current intensity?

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10.

Answer the following questions: 

How is urea prepared by Wohler synthesis?

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