Chemistry:2017:CBSE: [Delhi]:Set-I
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Q1
Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.
Marks:1View AnswerAnswer:
The group number of Manganese (Mn) is 7. Therefore, the formula of an oxo-anion of manganese (Mn) in which it shows the oxidation state 7 is MnO4–. Oxidation state of Mn in MnO4– can be calculated as follows:
Mn + (-2 x 4) = –1
Mn – 8 = –1
Mn = –1 + 8
Mn = +7
It shows that the oxidation of Mn in MnO4– is +7 which is equal to its group number which is 7.
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Q2
Write IUPAC name of the following compound:
(CH3CH2)2NCH3
Marks:1View AnswerAnswer:
The IUPAC name of the compound is:
N-Ethyl-N-methylethanamine
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Q3
For a reaction R → P, half-life (t1/2) is observed to be independent of the initial concentration of reactants. What is the order of reaction?
Marks:1View AnswerAnswer:
It is a first order reaction.
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Q4
Write the structure of 1-Bromo-4-chlorobut-2-ene.
Marks:1View AnswerAnswer:
Structure of 1-Bromo-4-chlorobut-2-ene is
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Q5
Write one similarity between Physisorption and Chemisorption.
Marks:1View AnswerAnswer:
Both physisorption and chemisorption depend on the surface area of the adsorbent and both increase with increase of surface area of the adsorbent.
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Q6
Complete the following reactions:
Marks:2View AnswerAnswer:
(a)
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Q7
What happens when
(i) (NH4)2Cr2O7is heated?
(ii) H3PO3 is heated?
Marks:2View AnswerAnswer:
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Q8
Define the following terms:
i) Colligative properties
ii) Molality(m)
Marks:2View AnswerAnswer:
(i) Colligative properties- These are the properties of the solutions which depends only on the number of solute particles irrespective of their nature.
For example: Relative lowering of vapour pressure, depression in freezing point etc.
(ii) Molality (m-) it is used for expressing the concentration of a solution. Molality is defined as the number of moles of solute particles dissolved in 1000g of solvent.
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Q9
Draw the structures of the following:
i) H2S207
ii) XeF6
Marks:2View AnswerAnswer:
(i)
(ii)
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Q10Marks:2View Answer
Answer:
