Chemistry:2012:CBSE:[All India]:Set-III
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Q1
Write the IUPAC name of the following.
Marks:1View AnswerAnswer:
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Q2
What are n-types semiconductors?
Marks:1View AnswerAnswer:
The semiconductor whose increased conductivity is a result of negatively-charged electrons is called an n-type semiconductor. These are generated when the crystal of a group 14 element such as Si or Ge is doped with a group 15 element such as P or As.
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Q3
Define 'peptization'.
Marks:1View AnswerAnswer:
Peptization is the process of conversion of a precipitate into a colloidal sol by shaking it with the dispersion medium in the presence of an electrolyte. The electrolyte used in this reaction is known as a peptizing agent.
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Q4
How is copper extracted from a low grade ore of it?
Marks:1View AnswerAnswer:
Copper is extracted by hydrometallurgy from low grade ores.
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Q5
What is the basicity of H3PO2 acid and why?
Marks:1View AnswerAnswer:
The H3PO2 contains one ionizable H-atom which is present as -OH group. Hence, it is monobasic. The structure of H3PO2 is as follows:
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Q6
Write the IUPAC name of the following.
Marks:1View AnswerAnswer:
Pent-2-en-1-al
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Q7
Write a reaction which shows that all the carbon atoms in glucose are linked in a straight chain.
Marks:1View AnswerAnswer:
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Q8
What is the cause of a feeling of depression in human beings? Name a drug which can be useful in treating this depression.
Marks:1View AnswerAnswer:
Depression is caused due to low level of adrenaline.
Anti-depressant drugs are needed to counteract the effect of depression. One such drug is Iproniazid. -
Q9
Explain the mechanism of acid catalysed hydration of an alkene to form corresponding alcohol.
Marks:2View AnswerAnswer:
Alkenes undergo direct hydration in the presence of mineral acids which act as catalysts. The addition of water to the double bond takes place in accordance with Markonikoff's rule.
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Q10
Complete the following chemical reaction equations:
Marks:2View AnswerAnswer:
