ECAT Chemistry Online Test With Answers

ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 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
2 All the following decompose easily on heating to give oxygen except Lead nitrate Potassium chlorate Mercuric oxide Manganese dioxide
3 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
4 Polyanion formation is maximum in Nitrogen Oxygen Sulphur Boron
5 When sulphur is boiled with Na2SO3solution, the compound formed is Sodium sulphides Sodiums sulphates Sodium persulphate Sodium thiosulphate
6 Oleum is Castor oil Oil of vitriol Fuming of H<sub>2</sub>SO<sub>4</sub> None of them
7 The number of unpaired electrons in the p-subshell of oxygen atom 1 2 3 4
8 Ozone is not An allotrope A powerful oxidizing agent Paramagnetic A bent molecule
9 Which of the following is acidic? SO<sub>3</sub> N<sub>2</sub>O BeO HgO
10 Which of the following oxides is peroxide? Na<sub>2</sub>O<sub>2</sub> MnO<sub>2</sub> BaO SO<sub>2</sub>
11 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
12 Hypo is used in photography for Developing picture Picture printed The colour of picture The fixation of picture
13 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
14 The acid used in lead storage cells is Phosphoric acid Nitric acid Sulphuric acid Hydrochloric acid
15 Which of the following is a tetrabasic acid? ORthophosphoric acid Hyposphosphorus acid Metaphosphoric Pyrophosphoric acid
16 Basicity of orthoposphoric acid is 2 3 4 5
17 P2O5is heated with water to give Hypophosphorus acid Phosphorus acid Hypophosphorus acid Orthophosphorus acid
18 Sodium hexametaphophate is known as Calgon Permutite Natalite Nitrolim
19 When ammonia is heated with cupric oxide, a molecule of ammonia will Gain 3 electrons Lose 3 electrons Gain 2 electrons Lose 2 electrons
20 HNO2acts as an/a Acid Oxidizing agent Reducing agent All the three
21 Which of the following compounds is explosive in nature? Phosphorus trichloride Nitrogen trichloride Hyponitrous acid Nitrosyl chloride
22 What causes nitrogen to be chemically inert? Multiple bond formation in the molecule Absence of bond distance Short internuclear distance High bond energy
23 White phosphorus is A mono atomic gas P<sub>4</sub>, a tetrahedral solid P<sub>8</sub>, a crown A linear diatomic molecule
24 Which of the following has highest dipole moment? NH<sub>3</sub> PH<sub>3</sub> AsH<sub>3</sub> SbH<sub>3</sub>
25 Orthophosphoric acid is Monobasic Dibasic Tribasic Tetrabasic
26 Which oxide of nitrogen is obtained on heating ammonium nitrate at 250° C? Nitric oxide Nitrous oxide Nitrogen dioxide Dinitrogen tetraoxide
27 The oxyacids of phosphorus in which phosphorus has the lowest oxidiation state is Hypophosphorus acid Orthophosphorus acid Pyrophosphorus acid Metaphosphorus acid
28 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>
29 Which of the following phosphorus is most reactive? Red phosphorus White phosphorus Scrlet phosphorus Violet phosphorous
30 Which element form group 15 gives most basic compound with hydrogen? Nitrogen Bismuth Arsenic Phosphorus
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