I. Answer any 5 questions 5x2=10
1. Write any two properties of cathode rays?
2. What is mass number give one example?
3. What is frequency and what are the units.
4. What is sp hybridization give one example.
5. Define ionic bond and give one factor favourable for the formation of ionic bond.
6. What is Granmolecular weight (GMW)
7. Calculate the oxidation number of oxygen in H2O
8. Define Redox reaction and one example.
II. Answer any Five questions 5x4=20
1. What are Fajan’s Rules.
2. Write about valency Bond theory (VBT)
3. Define oxidation number and give any five rules for determination of oxidation number.
4. What are the different types of Redox reaction.
5. Write about Rutherford’s α-ray scattering experiment.
6. Write about planks quantum theory.
7. What is emission spectrum. What are the different types of emission spectra.
III. Multiple correct choice questions 10x1=10
1. Speed of electromagnetic radiation is
a) 3x108 m/s b) 3x108 s/m c) 3x1010 m/s d) all
2. What are the values of n1 & n2 for Hβ line in the Lyn series of hydrogen atomic spectrum
a) 3&5 b) 2&3 c) 1 & 3 d) 2 & 4
3. In Lyman series if n1 = 1 and n2 = 3 then λ value is
a) =
8
9
b) 3
4
c) 4
3
d) 9
8
4. Which of the following relates to photons as a stream of particles?
a) Interference b) E = mc2 c) Diffraction d) E = hv
Answers
Answer:
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Hii dude here is your answer
➜Answer 1.
Property 1: Cathode rays travel in a straight line and can cast sharp shadows.
Property 2: Cathode rays are negatively charged. Property 3: Electric field and magnetic field deflect cathode ray
➜Answer 2.
The mass number is commonly cited in distinguishing among the isotopes of an element, all of which have the same atomic number (number of protons) and are represented by the same literal symbol; for example, the two best known isotopes of uranium (those with mass numbers 235 and 238) are designated uranium-235
➜Answer 3.
The number of periods or cycles per second is called frequency. The SI unit for frequency is the hertz (Hz). One hertz is the same as one cycle per second
➜Answer 4.
Any central atom surrounded by just two regions of valence electron density in a molecule will exhibit sp hybridization. Some examples include the mercury atom in the linear HgCl2 molecule, the zinc atom in Zn(CH3)2, which contains a linear C–Zn–C arrangement, the carbon atoms in HCCH and CO2, and the Be atom in BeCl2
➜Answer 5.
The favourable factors influence in ionic bond formation are as follows: (i) Low ionization enthalpy of metal atom. (ii) The two ion must be different & should possess opposite charge. (iii) High electron gain enthalpy (Δeg H) of a non-metal atom. (iv) High lattice energy of the compound formed.
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