ECAT Chemistry Chapter 14 Group IIIA & IVA Elements Online Test With Answers

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ECAT Chemistry Chapter 14 Group IIIA & IVA Elements Online Test

Sr. # Questions Answers Choice
1 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
2 The number of electron that are paired in oxygen molecule are 16 12 14 7
3 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>
4 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
5 The metal with highest electrical resistance at room temperature is Pb Te Po Fe
6 All the elements of oxygen family are Non metals Metalloids Radioactive Polymorphic
7 Which shows maximum catenation property? S Se Te O
8 Sulphuric acid reacts with PCl5to give Thionyl chloride Sulphur monochloride Sulphuryl chloride Sulphur tetrachloride
9 Permonosulphuric acid is known as Marshall's acid Carlo's acid Sulphuric acid None of these
10 The element which has a simple cubic lattice in solid state is Se Te Po None of these
11 Crystalline form of sulphur stable at room temperature is Rhombic sulphur Monoclinic sulphur Plastic sulphur Prismatic sulphur
12 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
13 The acid which has a peroxy linkage is Sulphurous acid Pyrosulphuric acid Dithionic acid Caro's acid
14 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
15 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
16 Sulphuric acid has great affinity for water because It hydrolyses the acid It decomposes the acid Acid forms hydrates with water Acid decomposes water
17 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
18 All the following decompose easily on heating to give oxygen except Lead nitrate Potassium chlorate Mercuric oxide Manganese dioxide
19 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
20 Polyanion formation is maximum in Nitrogen Oxygen Sulphur Boron
21 When sulphur is boiled with Na2SO3solution, the compound formed is Sodium sulphides Sodiums sulphates Sodium persulphate Sodium thiosulphate
22 Oleum is Castor oil Oil of vitriol Fuming of H<sub>2</sub>SO<sub>4</sub> None of them
23 The number of unpaired electrons in the p-subshell of oxygen atom 1 2 3 4
24 Ozone is not An allotrope A powerful oxidizing agent Paramagnetic A bent molecule
25 Which of the following is acidic? SO<sub>3</sub> N<sub>2</sub>O BeO HgO
26 Which of the following oxides is peroxide? Na<sub>2</sub>O<sub>2</sub> MnO<sub>2</sub> BaO SO<sub>2</sub>
27 Bond angle is minimum for H<sub>2</sub>O H<sub>2</sub>S H<sub>2</sub>Se H<sub>2</sub>Te
28 Hypo is used in photography for Developing picture Picture printed The colour of picture The fixation of picture
29 As a fixing agent in photography, sodium thisoulphate is used for Dissolving out unreacted silver bromide Converting silver Reducing solubility of AgBr Preventing overdeveloping and fogging
30 The acid used in lead storage cells is Phosphoric acid Nitric acid Sulphuric acid Hydrochloric acid
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