Give the characteristics test for the following gases, What happens when zinc granules are treated with a dilute solution of H. On adding a drop of Barium Chloride solution to an aqueous solution of sodium sulphate, a white precipitate is obtained. (c) Carbon dioxide is passed through lime water. is heated in the absence of air? Copyright © 2019 Sawaal.com | All Rights Reserved. Chemistry Questions & Answers for Bank Exams : Name the reddish brown gas evolved when Lead Nitrate is heated strongly. A solution of substance X is used for whitewashing. Name the gas which turns acidified potassium dichromate clear green. Why decomposition reactions are called the opposite of combination reaction. Thermal decomposition of a substance with cracking sound is called decrepitation. (a) What is an oxidation and reduction reaction? Why do silver articles become black after sometimes when exposed to air? Identify the type of chemical reaction and also write the chemical equation for the reaction that takes place when a solution of potassium chloride is mixed with silver nitrate solution. What is corrosion? When lead nitrate is heated, we could first hear a cracking noise. (1)On heating lead nitrate decomposes crackling sound.A Brown Gas,Nitrogen dioxide(NO2) evolves which has irritating smell.The gas turns blue Litmus red,hence Acidic in nature. Class 9: Solution Of Force and Law of Motion, Class 9: Solution of Matter in Our Surroundings, Class10: Solution of Chemical Reaction And Equation. Write two observations that you will make when an iron nail is kept in an aqueous solution of copper sulphate. I. 2g of ferrous sulphate crystals are heated in a boiling tube. Performance & security by Cloudflare, Please complete the security check to access. Describe an activity to show a decomposition reaction in which light is used to decompose reactants. 5 ; whn lead nitrate is heated, decomposition reaction occurs and PbO, NO2 and NO3 gases are released. Short answer type questions: 1. I. Write the name of brown coloured gas that evolves when lead nitrate crystals are heated in a dry test tube. (a) State the two types in which the above reaction can be classified. A substance X which is an oxide of a group 2 element, is used intensively in the cement industry. Justify this statement with the help of appropriate chemical equations of each. hand side with a minus sign between them. Differentiate between the reaction of magnesium and calcium with water  (giving an example). Give reactions when they are exposed to light. Give one example of each. In terms of electronic concept, oxidation is defined as a …….. of electrons while reduction is defined as a ……. What is redox reaction? Write the chemical name of one of the products obtained. Write the chemical equation for this reaction. Give reasons why chips manufacturers usually flush bags of chips with a gas such as nitrogen. takes place. (i) In thermite reaction, iron III oxide reacts with aluminum. Chemical reaction zinc oxide reacts with carbon to produce Zinc metal and carbon monoxide. Class 9: Solution of Is Matter Around Us Pure? (2)A yellow Solid Residue of lead oxide(PbO)remains in the test tube. Silver chloride turns grey when kept in sunlight. In the following. The balanced chemical equation is as follows : 2Pb(NO3)2 + heat = 2PbO+4NO2+O ( also an example of THERMAL DECOMPOSITION reaction.) 2. Write one chemical equation each for this reaction. e. Respiration is an endothermic reaction. (a) Why do you apply Paint on Iron articles? b. A solution of potassium iodide when mixed with lead nitrate solution, an insoluble substance is formed. The boiling tube is heated over the flame. Now answer the following: When a chemical reaction considered a double displacement reaction? (a) Give an example for a combination reaction which is exothermic. Why should the magnesium ribbon be cleaned before burning in air? Why is hydrogen peroxide kept in colored bottles? solution of two ionic compounds react by exchange of their ions is called. 2g of Lead Nitrate powder is taken in a boiling tube. (ii) Dissolution of sodium hydroxide in water. When is a chemical reaction categorized precipitation reaction? Write a balanced chemical equation for a chemical combination reaction. H 2 SO 4 to Lead sulphide and heat. which reactions, addition of oxygen or removal of hydrogen or loss of electron Write the chemical equation for reactions that takes place when lead nitrate and potassium iodide solutions are mixed. What is rancidity? Answer the following questions on the basis of observations made by the student: Write a balanced chemical equation for the reaction involved. Cloudflare Ray ID: 5f889daf5d2ffe1c protects the aluminium metal from further corrosion and damage. (a) name the substances X and Y. aluminium exposure to air, gets coated with a protective layer of, 7. Name the compound formed when. (i) A colourless gas which rapidly dissolves in alkaline pyrogallol solution and is a supporter of combustion. Explain by giving an example. (ii) Sodium Nitrite and Ammonium Chloride. On treatment with water, it forms a solution that turns red litmus blue. Which species is a conjugate acid of OH- ? (b) Dilute hydrochloric acid reacts with sodium carbonate. which gas is evolved when lead nitrate is heated. Write the skeletal equation for the following reactions. reaction in which two or more reactants combine to form a single product is What will be the molecular mass of Ammonia? The student takes 2 gm of ferrous sulphate crystal in a dry test tube and heats the test tube. When hydrogen gas is passed over heated Y it again changes back into X. PRACTICE PAPERClass XCHEMISTRY  (2020)  CHEMICAL REACTIONS & EQUATION, ___________________________________________________________________________________, 1.

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