Chemical Reactions Quiz2

CaCO3(s) heat CaO (s) + CO2(g) which kind of reaction is this?

• Oxidation reaction

• Precipitation Reaction

• Displacement reaction

• Thermal decomposition Reaction

The reason of conversion white silver chloride (AgCl) into blue colour in the presence of sunlight is

• Displacement of AgCl into Ag and Cl

• Oxidation of AgCl in presence of sunlight

• Decomposition of AgCl into Ag and Cl

• Redox Reaction between AgCl and sunlight

Which type of reactions are useful in black and white photography?

• 2AgCl(s) sunlight, 2Ag(s) + Cl2(g)

• 2AgBr(s) sunlight, 2Ag(s) + Br2(g)

• CaCO3(s) → CaO(s) + CO2(g)

• (A) and (B) both

Which are more active elements than copper?

• Iron and Aluminium

• Sodium and Magnesium

• Zinc and Aluminium

• Zinc and Lead

If during any chemical reaction insoluble substance is produced in water then that reaction is called type of reaction.

• Combination

• Double displacement

• Precipitation

• Redox

Na₂SO₄(aq) + BaCl2(aq) → BaSO4(aq) + NaCl(aq) Which type of reaction is this?

• Combination

• Double displacement

• Precipitation

Chemical reaction in which exchange of ions takes place between reactants, then such reactions are called which type of reactions?

• Displacement Reactions

• Combination reactions

• Thermal decomposition reactions

• Double displacement reactions

If copper powder is heated then black coloured coating is formed on it. Due to formation of which substance it occur?

• Copper II oxide

• Copper III oxide

• Copper II dioxide

• No substance is formed

If one reactant is oxidised and other reactant is reduced during chemical reaction, which type of reaction is that?

• Electrolysis

• Copper III oxide

• Redox

• No substance is formed

MnO2 + 4HCl→MnCl2 + 2H2O + Cl2, Give the type of reaction.

• Displacement

• Thermal decomposition

• Combination

• Redox