Question Paper

AHSEC (Assam higher secondary education council), HS final exam question paper 2013

HS final exam question paper 2013

HS final exam questions paper 2013 And also some important question answer to the papers.

AHSEC (Assam higher secondary education council), HS final exam question paper 2013class 12 Assam, HS 2nd year final exam question paper 2013 are available on this site. The question papers are available in the pdf format. The questions papers of the subjects are physics, chemistry, mathematics, biology, Assamese and English. And also the some important question answers of the papers.

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Mathematics

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Physics

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Chemistry

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Biology

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English

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Assamese

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Also-

Get “HS final exam question paper 2014”

Get “HS final exam question paper 2015”

Get “HS final exam question paper 2016”

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Some important questions answer of the paper English

13.(g)What other dreams did Sophie have besides having a boutique?(H.S-2013)

Ans: Besides having a boutique Sophie dreams of becoming a manager, or an actress or a fashion designer. She was a daydreamer. She entertained wild and impractical dreams.

12.(a) What did M. Hamel do when he wanted to go fishing?(H.S-2013)

Answer: When M. Hamel wanted to go fishing, he just gave a holiday.

13.(a)What was the commotion that Franz anticipated in the classroom? (H.S-2013)

Ans: That day Franz anticipated a pin drop silence in the classroom was. The atmosphere in the classroom was so still that everything had to be as quiet as Sunday morning that day.

12.(b) What is ‘Lost Spring’ about? (H.S-2013)

Answer: Lost Spring is about two poor Indian children Saheb and Mukesh who owing to the grinding poverty had to lose their childhood happiness for the sake of supporting their family.

Some important topics of chemistry

Adsorption and absorption:
  • Adsorption is the accumulation of molecular species at the surface rather than in the bulk of a solid or liquid.
  • On the other hand absorption is the accumulation of particle in the bulk of solid or liquid.
    eg: If a gas like oxygen, hydrogen, chlorine or sulphardioxide is taken in a closed vessel containing powdered charcoal, it is observed that the pressure of the gas in the vessel decreases. The gas molecules concentrate at the surface of the charcoal i.e gasses are adsorbed at the surface.
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Mechanism of adsorption:

Adsorption arises due to the fact that the surface particles of the absorbent are not in the same environment as the particles inside the bulk. The particles present on the surface posses unbalances or residue attractive forces. This forces of the adsorbent are responsible for attracting the adsorpbate particle on it surface. The extant of adsorption increases with the increase of surface area.

Thermodynamics explanation of adsorption:

Adsorption is an exothermic process. There for enthalpy of adsorption is negative. Also due to adsorption degree of disorder of the associate decreases. There fore enthropic change during adsorption is negative. Thermodynamicaly adsorption is possible if free energy change is negative.

Types of adsorption:

Adsorption depends on the interaction between the particles of adsorbate and absorbent.
On this basis they are divided into two types-

1) Physical adsorption or physisorption.
2) Chemical adsorption or chemisorption.

  • When the particles of adsorbate and adsorbent are help together by weak vander wall’s interaction, it is called physical adsorption.
  • On the other hand when the particles of adsorbate and adsorbent are help together by chemical bonding, it is called chemical adsorption.
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