CHEMISTRY PAPER MCQS IST HALF BOOK 9 EM
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| chemistry |
Student Name:
Roll No.
Marks Obtained/Total Marks:/ 60
Class: Class Nine Subject Name: Chemistry 9 Date:
I) Tick the correct option: (All questions / options - 12 / 0 ) 12 Marks
1) The atomic radius in the periodic table is.
a) Increase from top to bottom b) Decrease c) Increase ( d) Increase from left to right
2) The atomic radii of Be is:
a) 103 pm b) 113 pm c) 152 pm d) None of them
3) Element that has the highest electronegativity is.
a) F b) Cl c) Br d) As
4) Our bodies and as well as anything around us is the example of:
a) substance b) molecule c) matter d) mixture
5) In which block Group 1 and 2 are present.
a) s b) p c) d d) f
6) The melting point of sodium chloride is:
a) 600° C b) 750° C c) 800° C d) 900° C
7) The angular momentum of the electron is:
a) mvr= nn/2π b) mvr=n/2π c) mvr=2nn/2π d) mvr=nh/2π
8) The ionization energy of Potassium is.
a) 419 KJmol-1 b) 424 KJmol-1 c) 428 KJmol-1 d) 430 KJmol-1
9) The symbol of Boron is:
a) Be b) Br c) B d) Ba
10) Chlorine has
electrons in
a) 3 b) 4 c) 7 d) 8
11) Bohr presented atomic model in:
a) 1912 b) 1913 c) 1914
12) How much electron can be accomm
a) 8 b) 18 c) 32 d) 40
II) Write short answers to these questions
1) why the reactivity of metals increase in groups?
2) Which properties are affected by hydrogen bonding?
3) What are the physical and chemical properties of metals?
4) Define Chemistry?
5) What is the classical theory of radiation?
6) What is the difference between malleability and ductility?
7) What is the difference between polar and nonpolar compounds?
8) Differentiate between Rutherford atomic model and Bohr,s atomic model
9) U-235 fission produces two atoms. give their names.
10) Write any four properties of cathode rays?
11) What is the difference between bonded and lone pairs of electrons?
12) How many elements are placed in the 4th period?
13) How does an electron differ from a neutron?
14) Why chlorine can accept only 1 electron?
15) What is meant by periodic function?
16) What is the role of chemistry in our daily life?
17) How a cation is produced? Explain it with an example.
18) Why dipole forces of attraction are not found in halogen molecules?
19) Define Avogadro's number.Give example.
20) What are non-polar covalent compounds? Give example
21) Why do the isotopes of an element have different atomic masses?
22) How many elements in a short period and write its name?
23) What type of attractive forces exist between HCl molecules?
24) Define free radical. Give example.
III) Write Detailed /Long Answer to these Questions:
1) Explain covalent compounds with examples?
2) What do you know about Dobereiner`s triads and Newland`s law of Octaves?
3) What is the difference between ionization energy and electron affinity explain it in detail?
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