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What are the hydrocarbons? Distinguish alkanes from alke nes and each of them from alkynes giving one example of each. Also draw the structure s of each compound cited as example to justify your answer . CBSE class10 Science 20161 AnswerWhy certain compounds are called hydrocarbons? Write the general formula for homologous series of alkanes, alkenes and alkynes and also draw the structure of the first member of each series . Write the name of the reaction that converts alkenes into 1 AnswerName the gas libe rated when ethanol reacts with S odium metal? How do we get ethe ne from ethanol? Write chemical equation to justify your answer. State the role of acid in this reaction. CBSE class10 Science 20161 AnswerIf the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. Where and why do we general1 AnswerDraw the electron - dot structure for ethyne. A mixture of ethyne and oxygen is burnt for welding. In your opinion, why cannot we use a mix ture of ethyne and air for this purpose? CBSE- class10- Science 20151 AnswerFour elements P , Q, R, S have atomic number 12 , 13, 14 and 15 respective ly. Answer the following questions giving reasons. CBSE class10 Science 20161 Answer( a ) Name the products obtained on complete combustion of hydrocarbons? How is the gas evolved during combustion tested in the laboratory? Explain in brief. ( b ) Write the next higher homologue of : CBSE class10 Science 20161 AnswerWhat is meant by power of a lens? Define its SI unit. CBSE- class10- Science 20151 AnswerWhat is meant by power of a lens? Define its SI unit. CBSE- class10- Science 20151 AnswerDistinguish between uni sexual and bisexual flowers giving one example fro each. -cbse-biology-class10-20121 AnswerWhich of the two is a better option : CBSE class10 Science 20161 AnswerDistinguish between renewable and non-renewable sources of energy giving one example of each. 2006 CBSE Physic class 101 AnswerDraw and explain the structure of a neuron cbse-biotechnology-class11-20141 AnswerGive a chemical test to distinguish between saturated and unsaturated hydrocarbons. CBSE Chemistry1 Answer( a ) What is fragmentation in organisms ? Name a multicellular organism which reproduces by this method. ( b ) How does regeneration take place? Why is this process not possible in all animals? CBSE class10 Science 20161 AnswerList two physical and two chemical properties of acetic acid which a student can test in the school laboratory. CBSE class10 Science 20161 AnswerState the meaning of “biodiversity”. List one advantage each of conserving f orests and wild life. CBSE class10 Science 20161 Answer( a ) Fertilization is possible if ovulation has taken place during middle of menstrual cycle. Give reasons . ( b ) List in tabular form two distinguishing features between a sperm and an ovum. CBSE class10 Science 20161 AnswerState and describe in brief any three main factors responsible for the rise of new species. CBSE class10 Science 20161 AnswerAn object 4 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius o curvature 20cm. Use mirror formula to find the position, nature and size of the image. Also draw a ray diagram for th above situation and mark t1 Answer