chemical reaction and equation

Which of the given chemical equations is balanced?

• A) H₂O₂ → H₂O + O₂

• B) NaNO₃ → NaNO₂ + O₂

• C) CaCO₃ → CaO + CO₂

• D) Al₂CO₃ → Al₂O₃ + CO₂

Which of the following conditions is necessary for a chemical reaction?

• A) It must be accompanied with change in temperature and pressure

• B) At least one of the reactants must be in a fixed quantity

• C) It must follow the law of conservation of mass

• D) All of the above

In which reaction do two compounds exchange their ions to form two new compounds?

• A) Displacement reaction

• B) Double displacement reaction

• C) Synthesis reaction

• D) Decomposition reaction

Identify the substance which reduces a compound.

• A) A hydrating agent

• B) A dehydrating agent

• C) An oxidizing agent

• D) A reducing agent

In which reaction does the addition and the removal of oxygen takes place simultaneously?

• A) Oxidation reaction

• B) Reduction reaction

• C) Redox reaction

• D) Precipitation reaction

Identify the type of reaction: H₂ + Cl₂ → 2HCl

• A) Decomposition reaction

• B) Combination reaction

• C) Double displacement reaction

• D) Displacement reaction

Which of the following statements is correct about the given reaction?

• CO is being oxidized

• ZnO is being oxidized

• CO is being reduced

• ZnO is being reduced

Which of the given reactions is an odd one?

• A) Carbon + Oxygen → Carbon dioxide

• B) Hydrogen + Chlorine → Hydrogen chloride

• C) Glucose → Carbon dioxide + Water

• D) Sulphur + Oxygen → Sulphur dioxide

How is the decomposition of silver chloride carried out?

• A) By electricity

• B) By sunlight

• C) By heat

• D) By water

Which gas is used in flush bags of chips to prevent oxidation?

• A) Helium

• B) Neon

• C) Nitrogen

• D) Argon