ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 German silver does not contain Cu Zn Ni Mn
2 The number of unpaired electrons in ferrous ion ( Z - 26) is 3 2 4 5
3 The compound which gives oxygen on moderate heating is Zinc oxide Mercuric oxide Aluminium oxide Ferric oxide
4 High purity copper metal is obtained by Carbon reduction Hydrogen reduction Electrolytic reduction Thermite reduction
5 Bessemer converter is used in the manufacture of Pig iron Steel Wrought iron Cast iron
6 Sodium thisoulophate is used in photography because of its Oxidizing behaviour Reducing behaviour Complexing behaviour Photochemical behaviour
7 In the manufacture of iron from haematitie,limestone is added to act as Flux A reducing agent Slag An oxidizing agent
8 Rusting of iron is catalysed by Fe O<sub>2</sub> Zn H<sup>+</sup>
9 Which has the largest radius? CO<sup>3+</sup> Mn<sup>3+</sup> Fe<sup>3+</sup> Cr<sup>3+</sup>
10 Which of the following metal exhibits more than one oxidation? Na Mg Fe Al
11 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>
12 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
13 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>
14 Bell metal is an alloy of Cu, Zn, and Sn Cu, Zn and Ni Cu and Zn Cu and Sn
15 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
16 The number of electron that are paired in oxygen molecule are 16 12 14 7
17 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>
18 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
19 The metal with highest electrical resistance at room temperature is Pb Te Po Fe
20 All the elements of oxygen family are Non metals Metalloids Radioactive Polymorphic
21 Which shows maximum catenation property? S Se Te O
22 Sulphuric acid reacts with PCl5to give Thionyl chloride Sulphur monochloride Sulphuryl chloride Sulphur tetrachloride
23 Permonosulphuric acid is known as Marshall's acid Carlo's acid Sulphuric acid None of these
24 The element which has a simple cubic lattice in solid state is Se Te Po None of these
25 Crystalline form of sulphur stable at room temperature is Rhombic sulphur Monoclinic sulphur Plastic sulphur Prismatic sulphur
26 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
27 The acid which has a peroxy linkage is Sulphurous acid Pyrosulphuric acid Dithionic acid Caro's acid
28 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
29 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
30 Sulphuric acid has great affinity for water because It hydrolyses the acid It decomposes the acid Acid forms hydrates with water Acid decomposes water
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