Chemistry:2008:CBSE:[Delhi]:Set-I
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Q1
What is the coordination number of each type of ions in a rock-salt type crystal structure? Marks:1View AnswerAnswer:
The coordination number of each type of ions in a rock-salt type crystal structure is 6:6. -
Q2
Write the IUPAC name of the following compound:
Marks:1View AnswerAnswer:
5-methyl 1,3-hexandiol -
Q3
Arrange the following compounds in an increasing order of their acid strengths:
(CH3) 2CHCOOH, CH3CH2CH(Br)COOH,CH3CH(Br)CH2COOH Marks:1View AnswerAnswer:
(CH3) 2CHCOOH -
Q4
Write a chemical reaction in which the iodide ion replaces the diazonium group in a diazonium salt.
Marks:1View AnswerAnswer:
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Q5
Name a substance that can be used as an antiseptic as well as a disinfectant. Marks:1View AnswerAnswer:
Phenol -
Q6
Define the term ‘order of reaction’ for chemical reactions. 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. -
Q7
What causes Brownian movement in a colloidal solution? Marks:1View AnswerAnswer:
The Brownian movement in a colloidal solution is caused due to unbalances bombardment of the particles by the molecules of dispersion medium. -
Q8
In which one of the two structures,
, the bond angle has a higher value?Marks:1View AnswerAnswer:
has higher value of bond angle. -
Q9
List the reactions of glucose, which cannot be explained by its open chain structure. Marks:2View AnswerAnswer:
The following reactions of glucose cannot be explained by its open chain structure
1.It does not give 2,4-DNP test, Schiff’s test and does not form white
precipitate with NaHSO3 despite having –CHO group.2. The pentaacetate of glucose does not react with hydroxylamine despite
having –CHO group. -
Q10
Define the following terms in relation to proteins:
(i) Peptide linkage (ii) Denaturation Marks:2View AnswerAnswer:
(i) When carboxyl group of one amino acid and amino group of another amino acid are condensed together with elimination of water, it results in formation of -CO-NH- linkage. This linkage is called peptide linkage. This results in formation of dipeptide. (ii) A process that changes the physical and biological properties of the proteins without affecting their chemical composition is called denaturation (of proteins). The denaturation is caused by change in pH or temperature. It breaks the hydrogen bonds existing between protein molecules.
