iii.
The correct decreasing order of atomic radius is:
(A) F>O>S, (B) F>S>0, (C) S>F>O,
(D)
S>O>F
iv.
When a small piece of beryllium was added to water taken in a beaker, what will you
V.
observe?
(A) Vigorous chemical reaction occurs with revolution of a gas.
(B) Formation of Precipitate is seen.
(C) Colour of solution turns black.
(D) No reaction occurs.
The correct increasing order of reactivity of alkaline earth metals with water is:
(A) Be<Mg<Ca<Sr<Ba (B) Be<Mg<Ca<Ba<Sr
(C) Be<Mg<Ca<Sr<Be (D) Be<Ca<Mg<Sr<Ba
Which one of the following does not increase while moving down the group of the
modern periodic table?
(A) Atomic radius
(B) Metallic character
(C) Valence electrons (D) Number of shells
Which of the following is not an inert gas?
(A) Neon, (B) Krypton, (C) Radium, (D) Radon
vi.
vii.
Answers
The correct decreasing order of atomic radius is:
(A) F>O>S
Atomic radius of flourine is 147 pm, oxygen is 60 pm and sulphur is 100 pm.
When a small piece of beryllium was added to water taken in a beaker, what will you
observe?
(D) No reaction occurs.
Beryllium has oxide layer present over its surface, which hinders it's reaction with water.
The correct increasing order of reactivity of alkaline earth metals with water is:
(A) Be<Mg<Ca<Sr<Ba
Removal of electron is easier due to increased atomic radius and increase in number of shells down the group.
Which one of the following does not increase while moving down the group of the modern periodic table?
(C) Valence electrons
Valence electrons are number of electrons in Valence shell, which remains same for a group.
Which of the following is not an inert gas?
(C) Radium
Radium is an radioactive element.
Answer:
well... its a bit difficult Question
Explanation:
IDK !!!!!