Chemistry:2015:CBSE [All India] :Set -II
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Q1
A delta is formed at the meeting point of sea water and river water. Why?
Marks:1View AnswerAnswer:
Sea water contains electrolytes and river water contains colloids of sand and clay. When they meet, the electrolytes neutralise the charge existing on colloidal particles. As a result, precipitation of sand and clay takes place and delta is formed.
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Q2
What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 2/3rd of tetrahedral voids?
Marks:1View AnswerAnswer:
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Q3
Write the formulae of any two oxoacids of sulphur.
Marks:1View AnswerAnswer:
H2SO4 (Sulphuric acid)and H2SO3 (Sulphurous acid)
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Q4
Write the IUPAC name of the given compound.
Marks:1View AnswerAnswer:
1-ethoxy-2-methylpropane
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Q5
Which would undergo SN1 reaction faster in the following pair?
Marks:1View AnswerAnswer:
1-Bromopropane is 1° alkyl halide while 2- Bromopropane is a 2° alkyl halide. Since, 2° carbocation is more stable than 1° carbocation, the rate of SN1 will be faster in 2-Bromopropane than 1- Bromopropane.
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Q6
Write the reagents required in the following reactions.
Marks:2View AnswerAnswer:
i) CrO3/ PCC
ii) NH3/heat
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Q7
Arrange the following compounds in increasing order of their property as indicated.
i.) CH3COCH3, C6H5COCH3, CH3CHO
(reactivity towards nucleophilic addition reaction)
ii) Cl–CH2–COOH, F–CH2–COOH, CH3-COOH
(acidic character)
Marks:2View AnswerAnswer:
i). The reactivity order of given compounds towards nucleophilic addition is given as:
C6H5COCH3 < CH3COCH3 < CH3CHO
ii).The acidic character of the given compounds is as follows:
CH3-COOH < Cl–CH2–COOH< F–CH2–COOH
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Q8
i.) On mixing liquid X and liquid Y, volume of the resulting solution decreases. What type of deviation from Raoult’s law is shown by the resulting solution? What change in temperature would you observe after mixing liquids X and Y ?
ii.) What happens when we place the blood cell in water (hypotonic solution)? Give reason.
Marks:2View AnswerAnswer:
i) The resulting solution shows negative deviation from Raoult’s law. After mixing liquids X and Y, the temperature will decrease.
ii) If blood cell is placed in water, it will swell. As, water is hypotonic as compared to solution inside the blood cell, it will move inside cell due to osmosis and the cell will swell.
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Q9
(i) Write down the IUPAC name of the following complex:
[Co(NH3)5Cl]2+
ii)Write the formula for the following complex.
Potassium tetrachloridonickelate II)
Marks:2View AnswerAnswer:
i) Pentaamminechloridocobalt(III)
ii) K2[Ni(Cl)4]
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Q10
Calculate the time to deposit 1.27 g of copper at cathode when a current of 2A was passed through the solution of CuSO4.
(Molar mass of Cu = 63.5 g mol-1 , 1 F = 96500 C mol-1)Marks:2View AnswerAnswer:
