Quiz Sr3ScA & C (2023)

An equal volume of two gases is mixed together and a vigorous reaction occurs at room temperature and pressure conditions. What are the two gases?

• Nitrogen and hydrogen

• Hydrogen and oxygen

• Hydrogen and fluorine

• Chlorine and hydrogen

Which of the following ions will show a lilac colour flame when heated.

• Ca²⁺

• Cu²⁺

• Na⁺

• K⁺

Which of the following statements about the compound of Group 2 elements from magnesium to barium is correct?

• Carbonates of Group 2 elements produce bubbles when added to dilute nitric acid

• Nitrates of Group 2 elements produce nitrogen gas and oxygen gas on heating

• Oxides of Group 2 elements produce bubbles when added to dilute hydrochloric acid

• The oxides of group 2 elements are amphoteric

A 5.00 g sample of an anhydrous Group 2 metal nitrate loses 3.64 g in mass when heated strongly. Which metal is present?

• Magnesium

• Calcium

• Strontium

• Barium

Which of the following compounds show amphoteric properties?

• Ca(OH)₂

• NaOH

• Mg(OH)₂

• Al₂O₃

Electron configuration of X is: 1s² 2s² 2p⁶ 3s² 3p⁴. What is the formula of compound formed when sodium reacts with X?

• NaX

• NaX₂

• Na₂X

• Na₂X₃

Which of the followings particles difficult to remove its valence electrons?

• Ar(g)

• Cl^-(g)

• Ca⁺(g)

• Na⁺(g)

In the Periodic table of elements, the most reactive metal atom comprises of

• Large atomic radius and low electronegativity

• Large atomic radius and high electronegativity

• Small atomic radius and low electronegativity

• Small atomic radius and high electronegativity

Which of the following reactions showed the reaction happened when the lime mortar used to paint the walls is solidify.

• CaO(s) + H₂O(l) --> Ca(OH)₂(s)

• CaCO₃(s) --> CaO(s) + CO₂(g)

• Ca(OH)₂₍s) + CO₂(g) --> CaCO₃(s) + H₂O(l)

• Ca(HCO₃)₂(s) --> CaCO₃(s) + H₂O(l) + CO₂(g)

If a metal soluble in dilute H₂SO₄ to give H₂, but it hydroxide compound unable to soluble in excess NaOH. The metal is?

• Zn

• Mg

• Be

• Cr