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Notes On Chemical Reactions

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Published in: Chemistry
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Practice questions on the Types of chemical reactions for std Xth CBSE.

Joscelin R / Sharjah

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Qualification: B.Sc Chemistry (Hons.)

Teaches: Biology, Chemistry, Hindi, Physics, Science, Maths

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  1. Practice Questions Subject: Chemistry Grade: X/CBSE Q. I Translate the following statements to chemical equation and balance it: a. Hydrogen sulphide gas burns in air to give water and sulphur oxide b. Phosphorus burns in oxygen to give phosphorus pentaoxide c. Aluminium reacts with copper chloride to form aluminium chloride and copper d. Ammonia combines with copper oxide to form copper, nitrogen and water e. sodium hydroxide combines with sulphuric acid to form sodium sulphate and water. Q.2 State one characteristic each of the chemical reaction which takes place when a. when dilute sulphuric acid is passed through zinc granules b. Lemon juice (citric acid) is passed through potassium permanganate solution c. dilute sulphuric acid solution is added to barium chloride d. quicklime is treated with water Q.3 One of the following is an exothermic reaction a. electrolysis of water b. conversion of limestone to quicklime c. process of respiration d. process of photosynthesis Q-.4 One of the following do not happen during a chemical reaction: a. breaking of old bonds and formation of new bonds b. formation of new substance with different properties c. atoms of one element changes to atoms of another element d. A rearrangement of atoms takes place to form new products Q.5 A solid substance P which is very hard is used in construction of many buildings es- pecially floor. Substance P on strong heating decomposes into another solid Q and gas R. Solid Q reacts with water to release lot of heat to form substance S. When gas R is passed through a solution of S, then white precipitate of substance T is formed. T and P
  2. have similar chemical composition. a. What is substance P, write chemical formula and common name b. write balanced equation for reaction of Q with water c. write balanced equation for reaction of gas R with S Q.6 What types of reactions are depicted by following equations a. CaO +H20 - CaC03 b. 2Na + 2H20 - 2NaOH + H2 c. Mg + cuS04 MgS04 + cu d. cuS04 + +Na2S04 Q. 7 Identify in the reaction which substance is oxidised, reduced, which is oxidising agent and reducing agent: S02 + 2H2S 2H20 + 3S ZnO + C Zn + CO PbS + 4H202 PbS04 + H20 Q.8 What is the name given to the product of corrosion of iron ? Q. 9 What kind of reaction occurs during corrosion of iron? Q. 10 What is rancidity? explain the methods of preventing rancidity of food?

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