Question 26.
The first alkali metal is _________.
(a) hydrogen
(b) lithium
(c) sodium
(d) francium
Answer: (b) lithium
Question 27.
The arrangement of elements in the Modem Periodic Table is based on their
(a) increasing atomic mass in the period
(b) increasing atomic number in the horizontal rows
(c) increasing atomic number in the vertical columns
(d) increasing atomic mass in the group
Answer: (b) increasing atomic number in the horizontal rows
Question 28.
Accross a period from left to right atomic size will
(a) increase
(b) decrease
(c) no effect
(d) either increase or decrease
Answer: (b) A decrease
Question 29.
Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic
Table?
(a) Group 8
(b) Group 2
(c) Group 18
(d) Group 10
Answer: (c) Group 18
Question 30.
Across a period from left to right non metallic character will
(a) decrease
(b) increase
(c) nor decrease nor increase
(d) does not change
Answer: (b) increae
Question 31.
A purple coloured solid halogen is ________.
(a) chlorine
(b) bromine
(c) iodine
(d) astatine
Answer: (c) iodine
Question 32.
Element ‘X’ forms a chloride with the formula XCl2, which is a solid with high melting point. X would
most likely be in the same group of the periodic table as:
(a) Si
(b) Mg
(c) Al
(d) Na
Answer: (b) Mg
Question 33.
If the nuclear charge increases atomic size will
(a) increase
(b) derease
(c) does not change
(d) may be increase or decrease
Answer: (b) decrease
Question 34.
An element X from group 2 of the Periodic Table reacts with Y from group 17 to form a compound. Give the
formula of the compound.
(a) XY2
(b) XY
(c) X2Y
(d) (XY)2
Answer: (a) XY2
Question 35.
Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If
atomic number of carbon is 6, the atomic number of silicon is
(a) 7
(b) 14
(c) 24
(d) 16
Answer: (b) 14
Question 36.
metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?
(a) MO
(b) M2O
(C) M2O3
(d) MO2
Answer: (b) M2O
Question 37.
The elements A, B and C belong to groups 1, 14 and 17 respectively of the Periodic Table. Which two
elements will form ionic compounds?
(a) A and B
(b) A and C
(c) B and C
(d) None
Answer: (b) A and C
Question 38.
Pick out the chemically most reactive elements from the given triads.
Li, Na, K F, Cl, Br
(a) Li and F
(b) Li and Br
(c) K and F
(d) K and Br
Answer: (c) Kand F
Question 39.
Lanthanides and actinides are also called ___________.
(a) normal elements
(b) transtition element
(c) inner transition element
(d) nobel gases
Answer: (c) iner transition element
Question 40.
What is the atomic number of element of period 3 and group 17 of the Periodic Table?
(a) 10
(b) 4
(c) 17
(d) 21
Answer: (c) 17
Question 41.
The family of elements to which calcium belongs is __________.
(a) alkali metals
(b) alkaline earth metals
(c) halogn
(d) nobel gases
Answer: (b) alkaline earthmetals
Question 42.
The least reactive element in group 17 is ___________.
(a) iodine
(b) bromine
(c) chlorine
(d) flourine
Answer: (a) iodine
Question 43.
Which one of the following statements is not correct about the trends in the properties of the elements
of a period on going from left to right?
(a) The oxides become more acidic
(b) The elements become less metallic
(c) There is an increase in the number of valence electrons
(d) The atoms lose their electrons more easily
Answer: (d) The atoms lose their electrons more easily
Question 44.
Four elements along a period have atomic number (11, 13, 16 and 17). The most metallic among these has
an atomic number of __________.
(a) 11
(b) 12
(c) 16
(d) 17
Answer: (a) 11
Question 45.
A factor that affects the ionisation potential of an element is __________.
(a) atomic size
(b) atomic affinity
(c) electro negitivity
(d) neutrons
Answer: (a) atomic size
Question 46.
The element, which has zero electron affinity in the 3rd period is __________.
(a) Al
(b) Ar
(c) P
(d) S
Answer: (b) Ar
Question 47.
The statement that is not true about electron affinity is
(a) It causes energy to be released
(b) It causes energy to be absorbed
(c) It is expressed in electron volts
(d) It involves formation of an anion
Answer: (c) on Macdonald’s coat pockets
Question 48.
How many periods and groups are present in the periodic table?
(a) 8 periods and 7 groups
(b) 7 periods and 18 groups
(c) 7 periods and 7 groups
(d) 8 periods and 8 groups
Answer: (b) 7 periods and 18 groups
Question 49.
Which of the following forms the basis of the modern periodic table?
(a) atomic mass
(b) atomic number
(c) number of nuleons
(d) all of these
Answer: (b) atomic number
Question 50.
What happens to the electropositive character of elements on moving from left to right in a periodic table?
(a) increase
(b) decrease
(c) first increase than decrease
(d) first decrease than increase
Answer: (c) he is very harsh