Question 41 : The most electronegative element is?
1. Florine
2. Bromine
3. Iodine
4. Chlorine
View Answer   Discuss with Members

Question 42 : Cathode rays are deflected by?
1. Neither electric nor magnetic field.
2. An electric field only.
3. Both electric and magnetic field
4. A magnetic filed only
View Answer   Discuss with Members

Question 43 : Principle Quantum number describes?
1. Spin of orbital
2. Orientation of an orbital.
3. Shape of orbital
4. Size of orbital
View Answer   Discuss with Members

Question 44 : No two electrons in the same atom can have identical set of four quantum numbers. This statement is known as?
1. Hund's rule
2. Aufbaus rule
3. (n + 1) rule
4. Pauli's Exclusion principle
View Answer   Discuss with Members

Question 45 : When α — particles are sent through a thin metal foil, most of them go straight through the foil because?
1. α — particles are positively charged.
2. All of above
3. Most of the space is empty is an atom.
4. α — particles moves with high velocity
View Answer   Discuss with Members

Question 46 : The nature of cathode rays were identified by?
1. J.J. Thomson
2. Hitiroff
3. William Crook
4. J. Perrin
View Answer   Discuss with Members

Question 47 : The mass of electron as determined by J.J. Thomson is?
1. 9.1 X 10-31 kg.
2. 9.1 X 10^-10gm
3. 9.1 X 10^-25 kg
4. 9.1 X 10^-18gm
View Answer   Discuss with Members

Question 48 : An element has 18 electrons, and 20 .neutrons. Its charge is — What is its mass number?
1. 40
2. 32
3. 38
4. 39
View Answer   Discuss with Members

Question 49 : Anode rays were discovered by?
1. J.J. Thomson
2. J. Stoney
3. Rutherford
4. Goldstein
View Answer   Discuss with Members

Question 50 : Which of the following statement Is wrong about electron?
1. It has wave like property
2. Its motion is affected by magnetic field.
3. It is a particle
4. It emits energy while moving in orbit.
View Answer   Discuss with Members