ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Maximum potential energy that an electron can have within the atom is: Equal to zero. Less than zero. Greater than zero. Infinite
2 Which of the following particles has longest wavelength, if they have same speed: Proton. Neutron. Electron. Positron.
3 Which of the following was discovered first: Charge to mass ratio of electrons. Mass of electrons. Charge of electrons. All of above at same time.
4 The nature of positive rays depend on: Nature of discharge tube. Nature of resident gas. Nature of electrode. All of above.
5 The e.m value for positive rays maximum for: Oxygen. Nitrogen. Helium. Hydrogen.
6 Neutron was discovered by: Chadwick. Bohr. Rutherford. Plank.
7 When 6d orbital is complete, the entering electron goes into: 7f. 7s. 7p. 7d.
8 Orbital having same energy is called: Hybrid orbital. Valence orbital. Degenerate orbital. D-orbital.
9 Quantum number value for 2p orbitals are: n=2 ,l=1 n=1 ,l=2 n= ,l=0 n=2 ,l=0
10 In the ground state of an atom, the electron is present: In the nucleus. In the second shell. Nearest to the nucleus. farthest from the nucleus.
11 Splitting of spectral lines when atoms are subjected to strong electric field is called: Zeeman effect. Stark effect Photoelectric effect. Compton effect.
12 Bohr model of atom is contradicted by: Planck's quantum theory Pauli's exclusion theory Heisenberg's uncertainty principle. All of above.
13 Rutherford's model of atom failed because: The atom did o have a nucleus and electrons It did not account fro the attraction b/w protons and neutrons It did no account for the stability of the atom. There is actually no space b/w the nucleus ad the electrons.
14 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be: 500 NM. 500 M. 200 NM. 5 x 10<sup>7</sup>m
15 The velocity of photon is: Independent of its wavelength. Depends on its wavelength. Equal to square of its amplitude Depends on its source.
16 The nature of positive ray depend on: The nature of electrode. The nature of discharge tube. The nature of residual gas. All of above.
17 The boiling point of NH3 is maximum among the hydrides of group V elementsdue to: Enhanced electronegative character of Nitrogen Pyramidal structure of NH3 Very small size of Nitrogen. Enhanced electropositive character of Nitrogen
18 Which of the following liquids has low vapour pressure at 25°C:

 Diethyl ether Acetone. Water. Ethyl alcohol.
19 Which of the following liquids has low vapor pressure at 25°C:

 Diethyl ether Acetone. Water. Ethyl alcohol.
20 Escape of high energy molecules from the surface of liquid is called: Sublimation. Distillation. Condensation. Evaporation.
21 A liquid on evaporation causes: Heating effect. Cooling effect. Suffocation . All of above
22 At sea level and at 100°C the vapor pressure of water in an open system is:

 1000 mm Hg 760 mm Hg 730 mm Hg 670 mm Hg
23 Rate of evaporation and rate of condensation at equilibrium: Become very low Become very high Become equal Can never be equal.
24 Evaporation of water is possible at: Above 100<span style="font-size: 11pt; line-height: 107%; font-family: Arial, sans-serif; color: rgb(34, 34, 34); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°C</span> 0<span style="font-size: 11pt; line-height: 107%; font-family: Arial, sans-serif; color: rgb(34, 34, 34); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°C</span> 100<span style="font-size: 11pt; line-height: 107%; font-family: Arial, sans-serif; color: rgb(34, 34, 34); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°C</span> At all temperature
25 H2S is a gas while H2O is a liquid at room temperature. It is due to: Less inter-molecular forces in water. Covalent bonding H-O in water molecule. Hydrogen bonding in water molecules Ionic character in water molecules
26 Hydrogen bonding is present in one of the following pairs: NH<sub>3</sub> H<sub>2</sub>O HF All of above
27 Debye forces are present in on of the following pairs: Na+ion and water Argon and water Argon and Na+ion Ne and water
28 The strongest forces are: Debye froces London dispersion Dipole-dipole attraction Hydrogen bonding
29 Polypeptide chains are coiled about one another into a spiral by: Ionic bonds Covalent bonds Van der Waal's forces Hydrogen bonds
30 HF has exceptionally low acidic strength due to: Smaller size of fluorine. Stronger polar bond between H and F. Electronegativity of fluorine Strong hydrogen bonding
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