Question: Group 2 elements are called alkaline earth metals why? Choose the correct reason(s).
(i) Hydroxides formed by group 2 elements are alkaline in nature.
(ii) Their metal oxides are found in the earth’s crust.
(iii) Their oxides are alkaline in nature
(iv) Group 2 elements react with alkalies
- a) (i), (ii) and (iii)
- b) (i) and (ii)
- c) (ii) and (iv)
- d) (ii) and (iii)
Answer: (i), (ii) and (iii)
Question: Which of the following alkali metal is highly radioactive?
- a) Francium
- b) Rubidium
- c) Caesium
- d) None of these
Answer: Francium
Question: Which of the following statements is not correct for alkali metals?
- a) Alkali metals exist in free state in nature.
- b) Alkali metals are the most electropositive metals
- c) These metals have the largest size in a particular period of the periodic table.
- d) None of these
Answer: Alkali metals exist in free state in nature.
Question: Which of the following has largest size ?
- a) Na–
- b) Na
- c) Na+
- d) Can’t be predicted
Answer: Na–
Question: Ionization potential of Na would be numerically the same as
- a) electronegativity of Na+
- b) ionization potential of Mg
- c) None of these
- d) electron affinity of Na+
Answer: electronegativity of Na+
Question: Which one of the following properties of alkali metals increases in magnitude as the atomic number rises ?
- a) Ionic radius
- b) Melting point
- c) Electronegativity
- d) First ionization energy
Answer: Ionic radius
Question: Which of the following has density greater than water?
- a) Rb
- b) Na
- c) Li
- d) K
Answer: Rb
Question: The elements of group 1 provide a colour to the flame of Bunsen burner due to
- a) low ionization potential
- b) low melting point
- c) softness
- d) presence of one electron in the outermost orbit
Answer: low ionization potential
Question: The metal that produces red-violet colour in the nonluminous flame is
- a) Rb
- b) Ba
- c) Ag
- d) Pb
Answer: Rb
Question: The alkali metals have low melting point. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?
- a) Cs
- b) K
- c) Na
- d) Rb
Answer: Cs
More Questions........................................
Question: In the case of the alkali metals
- a) the cation is smaller than the atom
- b) the cation and the atom have about the same size
- c) the cation is larger than the atom
- d) the cation is less stable than the atom
Answer: the cation is smaller than the atom
Question: The element which on burning in air gives peroxide is
- a) sodium
- b) caesium
- c) lithium
- d) rubidium
Answer: sodium
Question: Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?
- a) Li
- b) Rb
- c) K
- d) Na
Answer: Li
Question: Which of the following is used as a source of oxygen in space capsules, submarines and breathing masks ?
- a) KO2
- b) Li2O
- c) Both
- d) None of these
Answer: KO2
Question: Which hydride is most stable
- a) LiH
- b) KH
- c) NaH
- d) CsH
Answer: LiH
Question: The most stable compound is
- a) LiF
- b) LiCl
- c) LiBr
- d) LiI
Answer: LiF
Question: Which of the following represents a correct sequence of reducing power of the following elements?
- a) Li > Cs > Rb
- b) Cs > Li > Rb
- c) Rb > Cs > Li
- d) Li > Rb > Cs
Answer: Li > Cs > Rb
Question: What is the colour of solution of alkali metals in liquid ammonia?
- a) Blue
- b) Violet
- c) Bronze
- d) Green
Answer: Blue
Question: Which is most basic in character ?
- a) CsOH
- b) NaOH
- c) KOH
- d) LiOH
Answer: CsOH
Question: Which compound will show the highest lattice energy
- a) NaF
- b) RbF
- c) CsF
- d) KF
Answer: NaF