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Ravi was performing some experiements related to the laws of chemical combination in the science laboratory under the guidance of his chemistry teacher Mr. John. Ravi found that when he burned 1 gram of hydrogen gas in 8 grams of oxygen gas in a closed vessel, he obtained 9 grams of water. He repeated this experiment many times but obtained the same results every time (a) Write a balanced chemical equation for the reaction between hydrogen and oxygen to form water. Also write the names of all the substances involved below their formulae in the equation (b) What are the reactants and products in the above reaction ? (c) Which law of chemical combination is illustrated by the fact that when Ravi burned 1g of hydrogen in 8g of oxygen, he obtained 9g of water ? (d) What mass of water will be obtained if 1g of hydrogen is burned in 10g of oxygen ? Which law of chemical combination will govern your answer ? (e) What values are displayed by Ravi in this episode ?

Read the following five statement about lifespan ( A to E) and select the options with all correct statements: (A) The peroid from birth to the natural death of an organism represents its life span . (B) Life span of organisms are correlated with their sizes. (C) The sizes of crows and parrots are not very differnet yet their life spans shown a wide difference. (D) A mango tree has a much shortes life span as compared to a peepal tree. ltbr gt (E) All higher oragnsims are immortal, they have no natural death .

One day Vabhav was performing experiments in the science laboratory based on the of chemical combination. Just then his chemistry teacher, Mr. Rajeev, came into the laboratory. Mr. Rajeev told Vaibhav that in an experiment conducted byby a class IX student when 10.6 g of sodium carbonate was reacted with 12.0g of ethanoic acid in a closed flask, then 16.4 g of sodium ethanoate, 4.4 g of carbon dioxide and an unknown mass of substances Y were produced. Mr. Rajeev asked Vaibhav to make use of this information and answer the following questions : (a) Write a word equation for the reaction which takes place on reacting sodium carbonate and ethanoic acid (b) Which is the substance Y which is produced in this reaction ? (c) What mass of substance Y is produced in this reaction ? (d) Which law of chemical combination has been made use of in calculating the mass of substance Y ? State this law (e) What values are displayed by Vaibhav in this eposide ?

Following are the conditions for short listing candidates for the post of Customer Relations officers (CRO for XYZ Limited. The candidate to be called for interview must A. be a graduate in Science i.e. B.Sc. with minimum 55% marks. B. Have atleast 3 yr experience in selling/marketing. C. have participated in debating or drama or sports at the inter college level onwards. D. have secured minimum 60% marks in the written examination. E. be ready to deposit ? 10000 as security deposit. Based on these criteria and information provided below, decide the courses of action in each case. You are not to assume anything. If the data provided is not adequate to decide the given course of action, your answer will be 'data inadequate'. All the candidates given below fulfill the criteria for age. Kurpa is a successful sports person and has won several prizes in sports and debating at inter college level onwards. In B.Sc., M.Sc. and written exam, she has obtained 62%, 55% and 65% marks, respectively. She has 5 yr experience in sales. Her father is a successful businessman.

Following are the conditions for short listing candidates for the post of Customer Relations officers (CRO for XYZ Limited. The candidate to be called for interview must A. be a graduate in Science i.e. B.Sc. with minimum 55% marks. B. Have atleast 3 yr experience in selling/marketing. C. have participated in debating or drama or sports at the inter college level onwards. D. have secured minimum 60% marks in the written examination. E. be ready to deposit ? 10000 as security deposit. Based on these criteria and information provided below, decide the courses of action in each case. You are not to assume anything. If the data provided is not adequate to decide the given course of action, your answer will be 'data inadequate'. All the candidates given below fulfill the criteria for age. Kanchan has 6 yr of experience in marketing consumer products. She has completed her B.Sc, M.Sc. and MBA with 65%, 56% and 62% marks, respectively. She is ready to pay the security deposit. She participated at debating competitions and has won many prizes in inter college/university events. She is interested in social work.

Following are the conditions for short listing candidates for the post of Customer Relations officers (CRO for XYZ Limited. The candidate to be called for interview must A. be a graduate in Science i.e. B.Sc. with minimum 55% marks. B. Have atleast 3 yr experience in selling/marketing. C. have participated in debating or drama or sports at the inter college level onwards. D. have secured minimum 60% marks in the written examination. E. be ready to deposit ? 10000 as security deposit. Based on these criteria and information provided below, decide the courses of action in each case. You are not to assume anything. If the data provided is not adequate to decide the given course of action, your answer will be 'data inadequate'. All the candidates given below fulfill the criteria for age. Dinkar has won many prizes in sports at inter college/university level. He has 7 yr of experience in direct sales. He has scored 65%, 56% and 53% marks in written exam, B.Sc. and M.Sc., respectively. He is ready to deposit security deposit and desires to make a career in selling.