Transition Elements Class Work PDF

# Chapter one Transition Elements ## CLASS WORK ### Lesson 5 #### Reactions of iron & iron compounds **1) For equal volume of four different acids are added to four identical pieces of iron separately. What is the acid whose reaction with iron ends in the shortest time?** a) dilute nitric acid...

# Chapter one Transition Elements ## CLASS WORK ### Lesson 5 #### Reactions of iron & iron compounds **1) For equal volume of four different acids are added to four identical pieces of iron separately. What is the acid whose reaction with iron ends in the shortest time?** a) dilute nitric acid b) concentrated sulphuric acid c) dilute hydrochloric acid d) concentrated nitric acid **2) When diluted sulphuric acid is added to test tube contains a mixture of iron (II) oxide and iron (III) oxide, after the reaction is completed the contents of the test tube will be ...** a) Iron (III) sulphate, iron (III) oxide and hydrogen b) Iron (II) oxide, iron (III) oxide and sulphur dioxide c) Iron (II) sulphate, Iron (III) oxide and water d) Iron (III) sulphate, Hydrogen and sulphur dioxide **3) Which of the following products produced on reaction concentrated H2SO4 with Fe and is not produced on reacting the same acid with mixed oxide ...** a) H2O b) FeSO4 c) SO2 d) Fe2(SO4)3 **4) Iron oxide, which is prepared by heating iron in air till redness, reacts with ...** a) Concentrated hydrochloric acid forming iron (II) salt and water b) Concentrated hydrochloric acid forming iron (II), (III) salts and water c) Concentrated sulphuric acid forming iron (I), (II) salts and water d) Concentrated sulphuric acid forming iron (III) salt and water **5) Which of the following steps are suitable to obtain red iron oxide?** a) heating iron in air to redness for short time b) adding dilute sulphuric acid to iron II oxide then heat the product c) heating iron II carbonate in absence of air d) passing stream of hot water vapor over hot iron at 500°C **6) By heating iron III hydroxide and the product is reduced at higher than 700°C so ... is formed.** a) iron b) magnetic iron oxide c) iron III oxide d) iron II oxide **7) The solid substance produced from the reduction of Fe2O3 at 880°C** a) reacts with dilute H2SO4 to produce FeSO4 and water b) reacts with hot concentrate H2SO4 to produce FeSO4, Fe2(SO4)3 and water vapor c) reacts with hot concentrate H2SO4 to produce FeSO4, Fe2(SO4)3, SO2 and water vapor d) reacts with hot concentrate H2SO4 to produce Fe2(SO4)3 and water vapor **8) The salt produced from the reaction of iron with dilute hydrochloric acid is similar to the salt produced from the reaction of iron with dilute sulphuric acid in all the following, except that ...** a) they both are paramagnetic substances b) they both are iron (II) salts. c) the molecule of each of them contains the same number of anions. d) their solutions have the same colour. **9) The correct order of processes that are needed to obtain iron II sulfide from iron II sulfate is ... and ...** a) reaction with sulfur, oxidation, thermal decomposition b) thermal decomposition, reduction, reaction with sulfur c) reduction, reaction with acids, thermal decomposition d) reaction with sulfur, reduction, thermal decomposition **10) X, Y and Z are three different oxides:** - X: Black oxide cannot react with dilute acids. - Y: Black oxide can react with both conc. and dilute acids. - Z: Red oxide cannot be oxidized under normal conditions. **To get iron II sulphate:** a) Reaction of (X) with concentrate sulphuric acid b) Reaction of (Z) with concentrate sulphuric acid c) Reduction of (Z) in blast furnace > 700°C then reacting the product with dilute sulphuric acid **11) To obtain magnetic iron oxide from iron (III) chloride, the following process are done in sequence ...** a) Reaction with hydrochloric acid - Oxidation - Reduction b) Reaction with alkaline solution - Thermal decomposition - Reduction c) Oxidation - Reduction - Thermal decomposition d) Thermal decomposition - Oxidation - reaction with alkaline solution **12) Complete the following diagram:** | | a) | b) | c) | d) | |-----|---------|-------------|--------|--------| | A | Fe | Fe3O4 | Fe2O3 | Fe | | B | FeO | Fe2O3 | Fe3O4 | FeO | | C | Fe2O3 | Fe | FeO | Fe3O4 | | D | Fe3O4 | FeO | Fe | Fe2O3 | **13) Study the opposite diagram the three compounds 1, 2 and 3 are respectively ...** | | 1 | 2 | 3 | |-----|-----|--------|---------| | a) | FeCl2| Fe2O3 | Fe (OH)3 | | b) | FeCl3| Fe (OH)3| Fe2O3 | | c) | FeCl3| Fe2O3 | Fe (OH)3 | | d) | FeCl2| FeO | Fe (OH)2 | **14) In the following figure: Which of the following choices is true representing A, B, C, D** | | A | B | C | D | |-----|-----------|------------|----------|----------| | a) | FeO | Fe2O3 | Fe3O4 | Fe2O3 | | b) | Fe3O4 | FeO | Fe2O3 | Fe | | c) | FeO | Fe2O3 | FeO | Fe2O3 | | d) | Fe | Fe3O4 | Fe2O3 | Fe3O4 | **15) The following scheme represents reactions at suitable conditions:** Which of the following is correct for the compounds (A), (C) and (E)? a) (A): Fe2O3, (C): Fe, (E): FeO b) (A): FeO, (C): Fe2O3, (E): Fe c) (A): Fe3O4, (C): FeO, (E): Fe d) (A): FeO, (C): Fe3O4, (E): Fe2O3 **16) Four iron compounds have the following properties:** - (A) its oxidation is difficult under normal condition - (B) decomposes thermally in absence of air forming iron III oxide and 2 different oxides - (C) decomposes thermally in absence of air forming iron II oxide and 2 different oxides - (D) produced from reacting the red oxide with concentrated sulphuric acid **Identify the previous compounds:** | | A | B | C | D | |-----|-----------|------------|----------|----------| | A | Fe3O4 | (COO)2Fe | FeSO4 | Fe2(SO4)3 | | B | Fe2O3 | FeSO4 | (COO)2Fe | Fe2(SO4)3 | | C | Fe2O3 | FeSO4 | (COO)2Fe | FeSO4 | | D | Fe2O3 | (COO)2Fe | FeSO4 | FeSO4 | **17) To differentiate between iron II oxide and iron III oxide we can use:** - pure water with shaking - Diluted mineral acids - Strong alkaline solution - Litmus solution **18) Iron fillings can be used to differentiate between ...** - Concentrated sulphuric acid and concentrated nitric acid - Diluted hydrochloric acid and diluted sulphuric acid - Iron (II) sulphate and iron (III) sulphate - Iron (III) oxide and iron (III) sulphate **19) Heating iron II oxalate in air strongly gives a solid compound (X) when concentrated hot sulphuric acid is added to compound (X) another compound (Y) will be formed. In comparing the properties of compounds (X) and (Y) it is found that ... ** a) The compound (X) has higher magnetic moment than (Y) and one of them is colored. b) The compounds (X) and (Y) have equal magnetic moment and both of them are uncolored. c) The compounds (X) and (Y) have equal magnetic moment and both of them are colored. d) The compound (Y) has higher magnetic moment than (X) and one of them is colored. **20) Which of the following processes occurs to iron II oxalate to produce iron on arrangement?** a) oxidation - reduction - thermal decomposition b) thermal decomposition - oxidation - reduction c) reduction - oxidation - thermal decomposition d) thermal decomposition - reduction - oxidation **21) Which of the following chemical processes could be done on limonite ore to get iron?** a) sintering and reduction b) roasting and reduction c) sintering and roasting d) roasting and steel production **22) Conc H2SO4 is added to each of:** - Substance (X) which is the solid product from iron ores roasting process - Substance (Y) which is the solid product from blast furnace **A- Which one of them produces an evolved gas?** **B- Which one of them produces substance that not changed if left in air for any period of time?** - **(X) Fe2O3 + H2SO4 → Fe2(SO4)3 + H2O** - **(Y) Fe + H2SO4 → FeCl2 + FeSO4 + SO2 + H2O**