Chemical Reactions and Equation (CBSE Class-10 Science): Questions 59 - 66 of 74

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Question number: 59

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

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What is a balanced chemical equation?

Question number: 60

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

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How are reactants and products distinguished in a chemical equation?

Question number: 61

» Chemical Reactions and Equation » Types of Chemical Reactions » Displacement Reaction

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A, B and C are three elements which reacts chemically in the following way

A2O3 + 2B → B2O3 + 2A

3CSO4 + 2B → B2 (SO4) 3 + 3C

3CO + 2A → A2O3 +3C

Answer the following

(A) Which element is most reactive?

(B) Which element is least reactive?

Question number: 62

» Chemical Reactions and Equation » Types of Chemical Reactions » Displacement Reaction

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Which type of chemical reaction occurs when Barium hydroxide and Ammonium chloride, are mixed together whether heat is released or absorbed?

Question number: 63

» Chemical Reactions and Equation » Chemical Equations » Balanced Chemical Equations

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How do we know that the chemical equation is balanced?

Question number: 64

» Chemical Reactions and Equation » Types of Chemical Reactions » Decomposition Reaction

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Which is the reaction which forms insoluble salts?

Question number: 65

» Chemical Reactions and Equation » Types of Chemical Reactions » Combination Reaction

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What is the concept of white washing of the walls?

Question number: 66

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

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A water insoluble substance ‘X’ when reacts with dilute H2SO4 released a colourless and odourless gas with a brisk effervescence. When this gas was passed through water, the solution so obtained turned blue litmus red. On passing this gas through lime water, it initially became milky and the milkiness disappeared when the gas was passed in excess. What is the substance ‘X’ and write the chemical equations of the reaction involved?

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