CLASS: X NCERT (CBSE)
Chemistry
Periodic Classification of Elements
Question 1: The properties of an element in the periodic table depends on its, ________.
1. atomic size
2. atomic mass
3. electronic configuration
4. number of protons
Answer: 3
Question 2: An element has configuration 2, 8, 1. It belongs to, _________.
1. 1 group and 3rd period
2. 3 group and 1st period
3. 1 group and 8th period
4. 17 group and 3rd period
Answer: 1
Question 3: The number of electrons in the valence shell is equal to its ________.
1. atomic mass
2. group number
3. period number
4. atomic volume
Answer: 2
Question 4: The non-metallic element present in the third period other than
sulphur and chlorine is _______.
1. oxygen
2. fluorine
3. nitrogen
4. phosphorus
Answer: 4
Question 5: At the end of each period the valence shell is __________.
1. incomplete
2. half filled
3. singly occupied
4. completely filled
Answer: 4
Question 6: The family of elements having seven electrons in the outermost shell is ______.
1. alkali metals
2. alkaline earth metals
3. halogens
4. noble gases
Answer: 3
Question 7: Which of the following factors does not affect the metallic character of an element?
1. Atomic size
2. Ionisation potential
3. Electronegativity
4. Atomic radius
Answer: 3
Question 8: The family of elements to which potassium belongs is _________.
1. alkali metals
2. alkaline earth metals
3. halogens
4. noble gases
Answer: 1
Question 9: The modern periodic table is given by ________.
1. Mendeleev
2. Einstein
3. Bohr
4. Mosley
Answer: 4
Question 10: Elements belonging to groups 1 to 17 are called __________.
1. noble gases
2. normal elements
3. transition elements
4. inner transition elements
Answer: 2
Question 11: A liquid non-metal is ___________.
1. phosphorous
2. mercury
3. bromine
4. nitrogen
Answer: 3
Question 12: The first alkali metal is _________.
1. hydrogen
2. lithium
3. sodium
4. francium
Answer: 2
Question 13: A purple coloured solid halogen is ________.
1. chlorine
2. bromine
3. iodine
4. astatine
Answer: 3
Question 14: Lanthanides and actinides are also called ___________.
1. normal elements
2. transition elements
3. noble gases
4. inner transition elements
Answer: 4
Question 15: The family of elements to which calcium belongs is __________.
1. alkali metals
2. alkaline earth metals
3. halogens
4. noble gases
Answer: 2
Question 16: The least reactive element in group 17 is ___________.
1. fluorine
2. chlorine
3. bromine
4. iodine
Answer: 4
Question 17: The valency of chlorine with respect to oxygen is __________.
1. 1
2. 3
3. 5
4. 7
Answer: 4
Question 18: The number of shells in the elements of 3rd period is __________.
1. 1
2. 2
3. 3
4. 0
Answer: 3
Question 19: Four elements along a period have atomic number (11, 13, 16 and 17). The most metallic among these has an atomic number of __________.
1. 11
2. 12
3. 16
4. 17
Answer: 1
Question 20: Six elements A, B, C, D, E and F have the following atomic numbers (A = 12, B = 17, C = 18, D = 7, E = 9 and F = 11). Among these elements, the element, which belongs to the 3rd period and has the highest ionisation potential, is __________.
1. A
2. B
3. C
4. F
Answer: 3
Question 21: A factor that affects the ionisation potential of an element is __________.
1. atomic size
2. electron affinity
3. electro-negativity
4. neutrons
Answer: 1
Question 22: The element, which has the highest electron affinity in the 3rd period is _________.
1. Na
2. Mg
3. Si
4. Cl
Answer: 4
Question 23: The element, which has zero electron affinity in the 3rd period is __________.
1. Al
2. P
3. Ar
4. S
Answer: 3
Question 24: The statement that is not true about electron affinity is
1. It causes energy to be released
2. It causes energy to be absorbed
3. It is expressed in electron volts
4. It involves formation of an anion
Answer: 2
Question 25: Down a group, the electron affinity __________.
1. increases
2. decreases
3. remains same
4. increases and then decreases
Answer: 2
