In the redox reaction MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂, identify the oxidizing agent.

Which of the following statements about a balanced chemical equation is true?

Respiration is considered an exothermic process because:

In the balanced equation: aFe + bH₂O → cFe₃O₄ + dH₂, what are the values of a, b, c, and d respectively?

When dilute hydrochloric acid is added to zinc granules, which of the following is observed?

An unbalanced chemical equation is also known as a:

A solution of a substance 'X' is used for whitewashing. Identify substance 'X'.

The reaction between sodium sulphate (Na₂SO₄) and barium chloride (BaCl₂) solutions results in the formation of a white precipitate. This reaction is classified as a:

The process of decomposition of a substance by passing electricity through it is known as:

When lead nitrate (Pb(NO₃)₂) is heated, it decomposes to form lead oxide, nitrogen dioxide, and oxygen. What is the color of the nitrogen dioxide gas evolved?

What happens when an iron nail is placed in a copper sulphate solution?

Which of the following processes is endothermic in nature?

The reaction CaO(s) + H₂O(l) → Ca(OH)₂(aq) is an example of which type of reaction?

Silver articles turn black after some time when exposed to air because they react with:

When aqueous solutions of lead(II) nitrate and potassium iodide are mixed, what is the color of the precipitate formed?

What is the chemical formula for rust?

Which gas is flushed into packets of chips to prevent rancidity?

The chemical reaction used in black and white photography is: