ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 High purity copper metal is obtained by Carbon reduction Hydrogen reduction Electrolytic reduction Thermite reduction
2 Bessemer converter is used in the manufacture of Pig iron Steel Wrought iron Cast iron
3 Sodium thisoulophate is used in photography because of its Oxidizing behaviour Reducing behaviour Complexing behaviour Photochemical behaviour
4 In the manufacture of iron from haematitie,limestone is added to act as Flux A reducing agent Slag An oxidizing agent
5 Rusting of iron is catalysed by Fe O<sub>2</sub> Zn H<sup>+</sup>
6 Which has the largest radius? CO<sup>3+</sup> Mn<sup>3+</sup> Fe<sup>3+</sup> Cr<sup>3+</sup>
7 Which of the following metal exhibits more than one oxidation? Na Mg Fe Al
8 Which of the following transition metal ions will have definite value of magnetic moment? Se<sup>3+</sup> Ti<sup>3+</sup> Cu<sup>+</sup> Zn<sup>2+</sup>
9 Iron, once dipped in concentrated H2SO4, does not displace copper from copper sulphates solution, because It less reactive than copper A layer of sulphates is deposited on it An inert layer of iron oxide is deposited on it All valence electrons of iron are consumed
10 Addition of iron fillings to CuSO4solution caused precipitation of Cu owing to the Reduction of Cu<sup>2+</sup> Oxidation of Cu<sup>2+</sup> Reduction of Fe Reduction of Fe<sup>3+</sup>
11 Bell metal is an alloy of Cu, Zn, and Sn Cu, Zn and Ni Cu and Zn Cu and Sn
12 When SO2is passed through acidified K2Cr2O7solution The solution turns blue The solution is decolourised SO<sub>2</sub>is reduced Green Cr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>is formed
13 The number of electron that are paired in oxygen molecule are 16 12 14 7
14 Which of the following is formed by the action of water on sodium peroxide? H<sub>2</sub> N<sub>2</sub> O<sub>2</sub> CO<sub>2</sub>
15 Electron affinity of sulphur is More than O and Se More than O but less than Se Less than O but more than Se Equal to O and Se
16 The metal with highest electrical resistance at room temperature is Pb Te Po Fe
17 All the elements of oxygen family are Non metals Metalloids Radioactive Polymorphic
18 Which shows maximum catenation property? S Se Te O
19 Sulphuric acid reacts with PCl5to give Thionyl chloride Sulphur monochloride Sulphuryl chloride Sulphur tetrachloride
20 Permonosulphuric acid is known as Marshall's acid Carlo's acid Sulphuric acid None of these
21 The element which has a simple cubic lattice in solid state is Se Te Po None of these
22 Crystalline form of sulphur stable at room temperature is Rhombic sulphur Monoclinic sulphur Plastic sulphur Prismatic sulphur
23 Identify the incorrect statement with respect to ozone Ozone is formed in the upper atmosphere by a photochemical reaction involving dioxygen Ozone is more reactive than diaoxygen Ozone is diamagnetic whereas dioxygen is paramagnetic Ozone protects the earth's inhabitants by absorbing gamma-radiations
24 The acid which has a peroxy linkage is Sulphurous acid Pyrosulphuric acid Dithionic acid Caro's acid
25 When a colourless gas is passed through bromine water only decolourisation takes place the gas is SO<sub>2</sub> HBR HCl H<sub>2</sub>S
26 Heavy water is obtained by Prolonged electrolysis of water Dissolving heavy salt in water Simple distillation of water Removing impurities of calcium and magnesium form water
27 Sulphuric acid has great affinity for water because It hydrolyses the acid It decomposes the acid Acid forms hydrates with water Acid decomposes water
28 Sometimes a yellow turbidity appears while passing H2S gas even in the absence of II group radicals. This is because Sulphur is present in the mixture as impurity IV group radicals are precipitated as sulphides Of the oxidation of H<sub>2</sub>S gas by some acid radicals III group radicals are precipitated as hydroxides
29 All the following decompose easily on heating to give oxygen except Lead nitrate Potassium chlorate Mercuric oxide Manganese dioxide
30 Which one of the following properties is not correct for ozone? It oxidizes lead sulphides It oxidizes potassium iodide It oxidizes mercury It cannot act as a bleaching agent
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