Science 2004 CBSE [ Delhi ] Set II
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Q1
Draw a figure to show how the rate of a chemical reaction in general changes as the temperature of reactants is increased step-wise. Marks:1View AnswerAnswer:
Out of syllabus. -
Q2
Name the classes of organic compounds represented by the following formulae-
(i)
(ii)
Marks:1View AnswerAnswer:
(i) Amino ethane Out of syllabus.
(ii) Ketone -
Q3
Name any two neutral oxides. Marks:1View AnswerAnswer:
Out of syllabus. -
Q4
How can it be shown that a magnetic field exists around a wire through which a direct electric current is passing? Marks:1View AnswerAnswer:
Magnetic field around a current carrying wire can be shown by deflection of magnetic needle of magnetic compass. -
Q5
Write the formulation for the functional groups of alcohols and carboxylic acids. Marks:1View AnswerAnswer:
Functional group for alcohols is –OH and for carboxylic acids is –COOH. -
Q6
Which hormone helps in lowering the level of blood glucose in human beings? Marks:1View AnswerAnswer:
Insulin. -
Q7
We suddenly withdraw our hand when a pin pricks. Name the type of response involved in this action. Marks:1View AnswerAnswer:
Reflex action (involuntary action). -
Q8
Who proposed the theory of natural selection? Why was this theory criticized? Marks:1View AnswerAnswer:
Darwin proposed the theory of natural selection . Darwin’s theory of natural selection was unable to explain mechanism for inheritance of traits from one generation to the next. -
Q9
What is the chemical name of washing soda? Name the three chief raw materials used for making washing soda by the Solvay process. Marks:2View AnswerAnswer:
The chemical name of washing soda is sodium carbonate decahydrate. The three chief raw materials used for making washing soda by the Solvay process are sodium chloride solution, carbon dioxide, ammonia. -
Q10
What is meant by ‘fermentation’? Write chemical equations for the two steps involved in preparing ethanol by the fermentation of molasses. Marks:2View AnswerAnswer:
Fermentation - It is the process of anaerobic breakdown of glucose by yeast to yield ethanol and carbon dioxide. Second part of the question is out of syllabus.
