Chemistry:2003:CBSE: [All India]:Set-II
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Q1
Name one ion whose central atom has the sp3d2 type of hybrid orbitals. Marks:1View AnswerAnswer:
[Cu(NH3)6]2+ -
Q2
Which radioactive series starts from U-235 and terminates at Pb-207 ? out of syllabus Marks:1View AnswerAnswer:
Not in 2008 CBSE syllabus -
Q3
What is meant by 'shape selective' catalysis’? Marks:1View AnswerAnswer:
The catalytic reactions which depend upon the pore structure of the catalyst and the size of the reactant and product molecules are known as 'shape selective' catalysis’. -
Q4
Why is the bond dissociation energy of fluorine molecule less than that of chlorine molecule? Marks:1View AnswerAnswer:
The bond dissociation energy of fluorine molecule is less than that of chlorine molecule because of greater repulsion between non–bonding electrons in small fluorine molecule. -
Q5
What is the effect of increasing pH on K2Cr2O7 solution? Marks:1View AnswerAnswer:
When the pH of K2Cr2O7 solution increases the orange coloured dichromate ions (Cr2O72-) present in it change into yellow coloured chromate ions (CrO42-). -
Q6
Name the following complex using IUPAC norms: [Co(en)2(ONO)Cl]Cl Marks:1View AnswerAnswer:
Chlorobis(ethylenediamine)nitritocobalt(III)chloride -
Q7
Why is cellulose in our diet not nourishing? Marks:1View AnswerAnswer:
Cellulose in our diet is not nourishing because human stomach does not have enzymes capable of breaking cellulose molecule. -
Q8
Write the composition of double-base propellant. Marks:1View AnswerAnswer:
Not in 2008 CBSE syllabus . -
Q9
What is meant by inversion of sugar? Marks:1View AnswerAnswer:
Sucrose is dextrorotatory but after hydrolysis it gives dextrorotatory glucose and levorotatory fructose. The specific rotation of fructose is more than glucose. As a result the solution of sucrose after hydrolysis becomes levorotatory. This change in sign of rotation is called inversion of sugar. -
Q10
Name the radio active series which starts from Plutonium-241 and terminates at Bismuth-209. Marks:1View AnswerAnswer:
Not in 2008 CBSE syllabus .
