ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 According to VSEPR theory, the shape of the water molecule is Octahedral Distorted tetrahedral Planar triangle Linear
2 Which of the following hydrides has the lowest boiling point? H<sub>2</sub>O H<sub>2</sub>S H<sub>2</sub>S3 H<sub>2</sub>Te
3 The shape of CIO-3according to valence shell electron pair repulsion theory will be Planar triangle Pyramidal Tetrahedral Square planar
4 H-bonding is not present in Glycerine Water Hydrogen sulphide Hydrogen fluride
5 The structure of ICI2is Trigonal Trigonal bipyramidal Octahedral Square planar
6 Which of the following species is paramagnetic? CO<sub>2</sub> NO O<sup>2-</sup> CN
7 The nature of interparticle forces in benzene is Dipole-dipole interaction Dispersion force Ion-dipole interaction H-bonding
8 A molecule in which sp2hybrid orbitals are used by the central atom in forming covalent bonds in He<sub>2</sub> SO<sub>2</sub> PCl<sub>5</sub> N<sub>2</sub>
9 Which of the following has unchanged valency? H Na Fe Oxygen
10 Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding? Orbital overlap will not occur Bonding will not occur Both (A) and (B) are correct None of the above are correct
11 Which one of these is weakest? Ionest bond Covalent bond Metallic bond Van der Waal's forces
12 XeF4has shape of Sphere Trigonal bipyramidal Tetrahedral Square planar
13 Inter molecular forces in solid hydrogen are Covalent forces Van der Waal forces or London dispersion forces Hydrogen bonds All of these
14 According to MO Theory, the species O2+ possesses bond order of 2.5 three unpaired diamagnetic character stability lower then O<sub>2</sub>
15 The bond angle H - O - H in ice ins closest to 120<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">° , 28<sup>'</sup></span> 60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 109<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
16 Outer shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be XY X<sub>2</sub>Y X<sub>2</sub>Y<sub>3</sub> XY<sub>2</sub>
17 Which of the following geometry is associated with the compound in which the central atom assumes sp3d hybridization? Planar Pyramidal Angular Trigonal bipyramidal
18 Covalent compounds are soluble in Polar solvents Non-polar solvents Concentrated acids All solvents
19 Among the alkaline earth metals the element forming predominantly covalent compounds is Be Mg Sr calcium
20 Hydrogen chloride molecule contains Covalent bond Double bond Co-ordinate bond Electrovalent bond
21 Water H2O is liquid while hydrogen sulphide H2S is a gas beause Water has higher molecular weight Hydrogen sulphide is a weak acid Sulphure has high electronegativity than oxyhe Water molecules associate through hydrogen bonding
22 When potassium metal is exposed to violet light Ejection of electrons takes place Ejection of some potassium atoms occurs There is no effect The absorption of electrons takes place
23 Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25 3.0 BM 4.9 BM 5.9 BM 6.9 BM
24 What is the packet of energy called? Electron Photon Positron Proton
25 Effective magnetic moment of Sc3+ion is 1.73 0 5.92 2.83
26 Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively 12 and 4 16 and 5 16 and 4 12 and 5
27 The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is 2,1,0 2,1,1 3,1,1 3,2,1
28 For principle quantum number n=4, the total number of orbitals having l = 3 is 3 7 5 9
29 The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element? 6 11 17 23
30 The orbital in Rutherford's model is Spiral Circular Both None
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