DPP -11C12 MOLE CONCEPT Q1. 12.044 × 1023 molecules of 𝐶𝑂2 at STP. Find (i) mass of the sample given (ii) Number of moles of CO2 (iii) Volume of CO2 in L at STP (iv) Number of ‘O’ atoms. (v) Number of ‘C’ atoms. Q2. An atom of 12𝐶. […]
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DPP -11C11 Empirical & Molecular Formula 1. A compound contains 4.07 % hydrogen, 24.27 % carbon and 71.65 % chlorine. Its molar mass is 98.96 g. What are its empirical and molecular formulas? 2. Determine the empirical formula of an oxide of iron, which has 69.9 % iron and 30.1 % oxygen by
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DPP -11C14 STOICHIOMETRY Q1. 𝑁2 + 3𝐻2 → 2𝑁𝐻3 𝑁2 is given 2000g & 𝐻2 is 1000g. Find the amount of 𝑁𝐻3 formed after the completion of reaction. Q2. 𝑁2 + 3𝐻2 → 2𝑁𝐻3 𝑁2 is given 50kg & 𝐻2 is 10kg. Find the amount of 𝑁𝐻3 formed
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DPP -9S12 STATE CHANGE & EVAPORATION 1. Aquatic animals use oxygen dissolved in water during respiration. Explain. 2. Sponge is a solid yet we are able to compress it. Why? 3. Describe the compressibility in Gases with example. 4. When a solid melts, its temperature remains the same, so where does the heat energy goes?
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DPP -11B13 The Living World 1.Define a Taxon. What is meant by Taxonomical Hierarchy ? Give the flow diagram from the lowest to highest category for a plant and an animal. 2.What is Biodiversity? 3.Tiger and Lion belong to the same Genus but different species. What saparates the two
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DPP -10S52 Life Process 1. State the location and function of gastric glands. 2. Answer the following questions:- Why is nutrition necessary for the human body? What causes movement of food inside the alimentary canal? Why is small intestine in herbivores longer than in carnivore? What will happen if mucus is not
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DPP -9S52 CELL : The fundamental unit of life 1. What is the main function of the plasma membrane in a cell? 2. What is the nucleus, and why is it important for the cell? 3. What is the cytoplasm, and what is it’s function in the cell? 4. Name four differences between plant and
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DPP-10S91 REFLECTION RAY DIAGRAM & NUMERICALS 1. An object, 2 cm in size, is placed at 25.0 cm in front of a concave mirror and is of focal length 10 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and size
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DPP-10S13 DECOMPOSITION REACTION 1. Why is the amount of gas collected in one of the test tubes in the Electrolysis of water is double of the amount collected in the other? Name this gas. 2. Why are decomposition reactions called the opposite of combination reactions? Write equations to explain. (CBSE 2012) 3. 2g
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DPP -9S51 CELL : The fundamental unit of life 1. Compare and contrast the structure and functions of prokaryotic and eukaryotic cells. Highlight at least three major differences and provide examples of organisms that belong to each group. 2. Discuss the discovery of the cell. Who were the key scientists involved, and
