ECAT Chemistry Online Test With Answers

image
image
image

ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 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
2 The structure of white phosphorus is Square planar Pyramidal Tetrahedral Trigonal planer
3 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>
4 Which of the following elements is most metallic? P As Sb Bi
5 Which of the following fluorides does not exists? NF<sub>5</sub> PF<sub>5</sub> AsF<sub>5</sub> SbF<sub>5</sub>
6 Phosphorus pentoxide finds use as An oxidizing agent A reducing agent A bleaching agent A dehydrating agent
7 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
8 White P when boiled with strong solution of caustic soda produces Phosphine Posh acid Phosphorous acid None
9 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
10 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
11 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>
12 BiCl3on hydrolysis forms a white precipitate of Bismuthio acid Bismuth oxychloride Bismuth pentachloride Bismuth hydroxide
13 Phosphide ion has the electronic structure similar to that of Nitride ion Fluoride ion Sodium ion Chloride ion
14 Which one of the following elements occurs free in nature? N P As Sb
15 The melting point is lowest for Be Mg Ca Sr
16 The number of elements in the 4th periods of periodic table is 8 10 18 32
17 The oxides of which of the following elements will be acidic in character Mg Rb Li Cl
18 Which of the following is an inert gas? H<sub>2</sub> O<sub>2</sub> N<sub>2</sub> Argon
19 Which of the following oxides is amopheric in character? CaO CO<sub>2</sub> SiO<sub>2</sub> SnO<sub>2</sub>
20 Which of the following ion has the highest value of ionic radius? Li<sup>+</sup> F<sup>-</sup> O<sup>2-</sup> B<sup>3+</sup>
21 The elements with atomic numbers 9, 17, 35, 53, 85 an all Noble gases Halogens Heavy metals Light metals
22 How does the ionization energy of 1st group elements vary? Increases down the group Decreases down the group Remains unchanged Variation is not regular
23 Number of elements present in 5th period is 8 18 32 24
24 Two elements whose electronegativities are 1.2 and 3.0, the formed between them would be Ionic Covalent Coordinate Metallic
25 Electron affinity depends on Atomic size Nuclear charge Atomic number Atomic size and nuclear charge both
26 Which is true about the electronegativity order of the following? P &gt; Si C &gt; N Br &gt; Cl Sr &gt; Ca
27 Eka-aluminium and Eka-silicon are known as Gallium and Germanium Aluminium and silicon Iron and sulphur Proton and silicon
28 Which among the following species has the highest ionization energy? Ne F Li B
29 Which of the following does not exhibit the periodicity in properties of the elements? Ionisation energy N/P ratio Electronegativity Atomic radius
30 Which of the following sets of atomic numbers belong to that of the alkali metals? 1,12,30,4,62 37,19,3,55 9,17,35,53 12,20,56,88
Download This Set
×