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 Which of the following is a tetrabasic acid? ORthophosphoric acid Hyposphosphorus acid Metaphosphoric Pyrophosphoric acid
2 Basicity of orthoposphoric acid is 2 3 4 5
3 P2O5is heated with water to give Hypophosphorus acid Phosphorus acid Hypophosphorus acid Orthophosphorus acid
4 Sodium hexametaphophate is known as Calgon Permutite Natalite Nitrolim
5 When ammonia is heated with cupric oxide, a molecule of ammonia will Gain 3 electrons Lose 3 electrons Gain 2 electrons Lose 2 electrons
6 HNO2acts as an/a Acid Oxidizing agent Reducing agent All the three
7 Which of the following compounds is explosive in nature? Phosphorus trichloride Nitrogen trichloride Hyponitrous acid Nitrosyl chloride
8 What causes nitrogen to be chemically inert? Multiple bond formation in the molecule Absence of bond distance Short internuclear distance High bond energy
9 White phosphorus is A mono atomic gas P<sub>4</sub>, a tetrahedral solid P<sub>8</sub>, a crown A linear diatomic molecule
10 Which of the following has highest dipole moment? NH<sub>3</sub> PH<sub>3</sub> AsH<sub>3</sub> SbH<sub>3</sub>
11 Orthophosphoric acid is Monobasic Dibasic Tribasic Tetrabasic
12 Which oxide of nitrogen is obtained on heating ammonium nitrate at 250° C? Nitric oxide Nitrous oxide Nitrogen dioxide Dinitrogen tetraoxide
13 The oxyacids of phosphorus in which phosphorus has the lowest oxidiation state is Hypophosphorus acid Orthophosphorus acid Pyrophosphorus acid Metaphosphorus acid
14 The most acidic of the following compounds is P<sub>2</sub>O<sub>3</sub> Sb<sub>2</sub>O<sub>3</sub> B<sub>2</sub>O<sub>3</sub> As<sub>2</sub>O<sub>3</sub>
15 Which of the following phosphorus is most reactive? Red phosphorus White phosphorus Scrlet phosphorus Violet phosphorous
16 Which element form group 15 gives most basic compound with hydrogen? Nitrogen Bismuth Arsenic Phosphorus
17 Group VA of the periodic table consists of the elements N, P, As, Sb and Bi, On passing from N to Bi, the oxides of the elements of general formula M2O3become Stronger reducing agents More ionic More basic More volatile
18 The structure of white phosphorus is Square planar Pyramidal Tetrahedral Trigonal planer
19 Which one of the following pentafluorides cannot be formed? PF<sub>5</sub> AsF<sub>5</sub> SbF<sub>5</sub> BiF<sub>5</sub>
20 Which of the following elements is most metallic? P As Sb Bi
21 Which of the following fluorides does not exists? NF<sub>5</sub> PF<sub>5</sub> AsF<sub>5</sub> SbF<sub>5</sub>
22 Phosphorus pentoxide finds use as An oxidizing agent A reducing agent A bleaching agent A dehydrating agent
23 Red P can be obtained form white P by Heating it with a catalyst in an inert atmosphere Distilling it in an inert atmosphere Dissolving it in CS<sub>2</sub>and crysllizing Melting it ad pouring the liquid into water
24 White P when boiled with strong solution of caustic soda produces Phosphine Posh acid Phosphorous acid None
25 Phosphine is not obtained by the reaction when White P is heated with NaOH Red P is heated with NaOH Ca<sub>2</sub>P<sub>2</sub>reacts with water PH<sub>4</sub>l is boiled with water
26 Each of the following is true of white and red phosphours except that they Are both soluble in CS<sub>2</sub> Can be oxidized by heating in air Consist of the same kind of atoms Can be converted into one another
27 Which on of the following compounds does not exist? NCl<sub>5</sub> AsF<sub>5</sub> SbCl<sub>5</sub> PF<sub>5</sub>
28 BiCl3on hydrolysis forms a white precipitate of Bismuthio acid Bismuth oxychloride Bismuth pentachloride Bismuth hydroxide
29 Phosphide ion has the electronic structure similar to that of Nitride ion Fluoride ion Sodium ion Chloride ion
30 Which one of the following elements occurs free in nature? N P As Sb
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