MCQ 2025 PDF

(1) 1- A non transition element its electronic configuration……… a- ns2 , (n+1)d10 b- n s2 , nd10 c- ns2, (n-1)d10 d - 4s1 , 3d10 2- 3-Which of the following is correct about X … a- Transition element its alloy with steel is used in making car springs b- Transition el...

(1) 1- A non transition element its electronic configuration……… a- ns2 , (n+1)d10 b- n s2 , nd10 c- ns2, (n-1)d10 d - 4s1 , 3d10 2- 3-Which of the following is correct about X … a- Transition element its alloy with steel is used in making car springs b- Transition element its alloy with copper is called bronze c-Its oxide is oxidizing agent d- Its sulphate salt is used as insecticide 4)Reaction of hot iron combines with most non metals is ………… a-Indirect and always produces iron III salt. b-Direct and may produce iron II or III salts c-Direct and always produces iron II salt d-Direct and always produces iron III salt 5)The product of reaction of iron with acids depends on……………. a-Type of acid and its quantity b-Amount & concentration of acid c-Type and concentration d-Basicity of the acid and amount acid 6)On heating the mixed oxide in the presence of reducing agent at 500 C0 …… is formed. a-Iron b-Magnetic iron oxide c-Iron IIIoxide d-Iron II oxide (2) 8)All of the following produces 2 different gases except……… a-Putting iron filling in dil. H2SO4 b-Heating iron II oxalate in air c-Heating iron II sulphate d-Iron ore roasting 9)On heating the red oxide in presence of the reducing agent used in blast furnace at temperature 250 C0 then doubling the temperature……is formed a-Iron b-Magnetic iron oxide c-Iron II oxide d-Iron III oxide 10)An excess amount of acid was added to iron filling and by approaching a glowing match to the mouth of the tube, no explosion occurs this means that the acid is: a-Diluted sulphuric b-Diluted HCl c-Conc. Sulphuric d-Conc. HCl 11) Study the following reactions then answer Fe2O3 ← Fe3O4 → FeO B A What is the name of reaction (A) & (B) respectively? a- Oxidation - oxidation b- Oxidation - reduction c- Reduction - oxidation d- Reduction - reduction 12)Which of the following arrangement indicates iron filling? (3) 16)Which of the following alloys is produced due to the substitution of an atom with another of the same size and chemical properties a-Steel / Ni - Cr b-Cu - Al / Ni - Al c-Fe - Cr / Au - Cu d-Al - Ni / Al - Cu 17)A process aims to increase iron percentage in the ore……………. a-Crushing – sintering b-Concentration – crushing c-Roasting – concentration d-Sintering – roasting 18)For production of car springs, vanadium is added to iron in: a-Midrex or blast furnaces b-Midrex or open hearth furnaces c-Oxygen converter or blast furnace d-Electric or open hearth furnaces (4) 19)You have two alloy first Zn +Fe and second Zn +Cu. How to differentiate between them? a- By diluted HCl the first dissolves and copper precipitates in the second b- By diluted HCl , the first dissolves and the second doesn't dissolve c-By conc. Nitric acid, the first dissolves and copper precipitates in the2nd d-By conc. Nitric acid, both alloys dissolve. 20) An element X lies in the fifth column of the periodic table so the formula of its oxide that has the maximum magnetic moment a-XO2 b- X2O3 c- X2O5 d- XO 21)Variable Oxidation states is shown by a-Ag b- Hg c- Y d- Mg 22) Which of the following has all d- orbitals are paired with electrons …. a-MnO4-3 b-CrCl5 c- CuF d- TiSO4 23) Y , Na are similar in a-Form colored compounds b- Have variable oxidation states c- Form diamagnetic compound d- Have no single electrons in atomic state 24) All of the following can be produced by normal reaction except a-Fe2(SO4)3 b- Cd2O3 c- Ag2O d- Mn(NO)3 25)The important of the catalyst in the chemical reaction is…. a-Preparing a path with high energy for the reaction b-Preparing a path with low energy for the reaction c-Increasing the activation energy d-Increasing the time but decrease the activation energy (5) 26)From the table a-A & B form together an alloy used in heating coils b-B & C form together an alloy used in the manufacturing of planes & aircrafts c- B can easily corrode d-C is used in metal plating 27)The product of adding diluted HCl into a mixture of two different iron oxides both are black,………………. a-No reaction occurs b-A mixture of iron II & III c-Mixture dissolves d-FeCl2 solution and black ppt. 28)We can chemically differentiate between iron II &III oxide by? a-Heating in air so, each of them become black b-Adding diluted HCl so, each of them dissolve c-Adding concentrated sulphuric acid so, iron II oxide only dissolves d-Adding diluted sulphuric acid so , FeO dissolves and iron III oxide precipitates 29)The oxidation states that explains that coinage metals are transition=... a- +1 b- -3 b-+2 d-0 -2 30)Cobalt in (CoF6) ion contain …….. single electrons. a- 4 b- 3 c-2 d- 5 31)One of the following aqueous solutions appears blue a-ScCl3 b-Cr2(SO4)3 c-ZnSO4 d-CuCl2 2 x 32)The electronic configuration of the last energy level ns , (n-1)d where x= 6 , n = 5. What is the atomic number of this element? a-44 b- 26 c-25 d-27 st 33)An elements in the 1 transition series the number of electrons lost from (4s) = that lost from (3d), it forms an oxide its formula is………….. a-MnO2 b-Cr2O3 c-V2O5 d-TiO (6)  34)A main transition element X, the number of lost electrons from sublevel 3d = half the electron lost from 4s sublevel to reach a relatively stable oxidation state, so the element that precedes X in the same period: a-Is used as a catalyst in ammonia preparation b-Has the same number of single electrons in TiO c-Is used in making an antiseptic substance d-Is used to detect malignant tumors 35)Which of the following elements is more suitable to manufacture bodies of aircrafts and planes? Element Density Hardness & rigidity Corrosion resistance A (A) High High Low B (B) High Low Low C (C) Low High High D (D) Low Low High 36)We can convert siderite into iron II Chloride through …… a-Roasting –adding conc. HCl -Reduction b-Roasting –-Reduction- passing Cl2 gas c-Roasting –Reduction -adding conc. HCl d- Roasting –Oxidation -adding dil.HCl 37)All the following process needs a catalyst to occure except a- Preparation of ammonia in industry b-Detection of glucose using Fehling solution c-Conversion of SO2 into SO3 d-Hydrogenation of oils 38) All the following alloys are formed from metal elements except ……. a-Cementite b- Stainless steel c- Dure alumin d- Ferro manganese 39) X,Y & Z are three iron compounds, where their color changes to red on heating. If the change in (Z) & (X) occurred due to thermal decomposition and in (Y) due to oxidation. What are (X) , (Y) & (Z)? a- FeCl2 – Fe3O4 – FeCO3 b-Fe(OH)3 – FeO – FeSO4 c-Fe2(SO4)3 – 2Fe2O3.3H2O – FeS d) FeCl3 – Fe3O4 – FeCO3 (7)  40) ) X and Y are two acids.X react with iron and only iron II salt is formed, Y react with iron and a mixture of iron salts is formed ,which one react with the highest iron oxide a- X and give jron III and water b- Y and give jron III and water c- X and give jron III , iron II and water d- Y and give jron III , iron II and water …………………………………………………………………………………….. 41)XCl3 is a compound. Which element(s) can not form this compound[Why] [Sc – Fe – Zn – Ti] …………………………………………………………………………………….. ……………………………………………………………………………………… ……………………………………………………………………………………… 42) 1-Mention the use of element Z as a catalyst 2-Mention the name and the use of an alloy from Y and Z (8)