Chemistry:2008:CBSE:[All India]:Set-II
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Q1
Define ‘order of chemical reaction’. Marks:1View AnswerAnswer:
The sum of powers of the concentration terms of reactants in the rate law expression is called the order of the reaction. -
Q2
What is the total number of atoms per unit cell in a face-centred cubic (fcc) crystal structure? Marks:1View AnswerAnswer:
Four -
Q3
Why is the bond angle in PH3 molecule lesser than that in NH3 molecule? Marks:1View AnswerAnswer:
The elctronegativity of Nitrogen is greater than that of Phosphorus, so the force of repulsion between the bond pairs and lone pairs of electrons is greater in NH3 than PH3. Therefore, the bond angle in PH3 molecule lesser than that in NH3 molecule. -
Q4
Of physisorption and chemisorption which type of adsorption has a higher enthalpy of adsorption? Marks:1View AnswerAnswer:
Chemisorptions -
Q5
Draw the structure of the compound whose IUPAC name is 4-Chloropentan-2-one. Marks:1View AnswerAnswer:
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Q6
Define the term vulcanisation. Marks:1View AnswerAnswer:
The process in which raw rubber is heated with sulphur at 373-415 K. It introduces sulphur bridges or cross links between polymer chains. -
Q7
Write the IUPAC name of the following compound: CH3 - O - CH2 - CH - CH2 - CH3
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CH3Marks:1View AnswerAnswer:
2-methyl-2-methoxybutane -
Q8
Write a chemical reaction in which the iodide ion replaces the diazonium group in a diazonium salt. Marks:1View AnswerAnswer:
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Q9
List the factors which influence the rate of a chemical reaction. Marks:2View AnswerAnswer:
Factors which influence the rate of reaction are (1) Nature of Reactants (2) Concentration of Reactants (3) Temperature (4) Pressure of Catalysts (5) Surface area of reactants (6) Pressure of light -
Q10
Sate the law co-relating the pressure of a gas and its solubility in a liquid. State an application of this law. Marks:2View AnswerAnswer:
Henary’s Law:- The law states that “the Solubility of a gas in a liquid is directly proportional to the pressure of the gas. Application: To increase the solubility of CO2 in soft drinks and Soda water, the bottle is sealed under high pressure.
