Science Practice Quiz 15

Q1.What is the general reaction between a metal oxide and an acid?

A. Metal oxide + Acid → Salt + Water B. Metal oxide + Acid → Salt + Hydrogen C. Metal oxide + Acid → Base + Water D. Metal oxide + Acid → Carbon dioxide + Water

Q2.When dilute hydrochloric acid is added to copper oxide, what is the observed colour of the resulting solution?

A. Red-brown B. Colourless C. Blue-green D. Yellow

Q3.The blue-green colour observed when copper oxide reacts with dilute hydrochloric acid is due to the formation of which compound?

A. Copper(I) oxide B. Copper(II) chloride C. Copper hydroxide D. Copper sulfate

Q4.What happens to the effect of a base when an acid is added to it?

A. It is enhanced B. It is nullified C. It remains unchanged D. It becomes acidic

Q5.In the activity described, if phenolphthalein solution is added to dilute NaOH solution, and then dilute HCl is added drop by drop, what is the sequence of colour changes observed for the phenolphthalein?

A. Pink to colourless B. Colourless to pink C. Pink to blue D. Blue to pink

Q6.What is the nature of metallic oxides?

A. Acidic B. Basic C. Amphoteric D. Neutral

Q7.When metallic oxides react with acids, what are the products formed?

A. Salt and hydrogen gas B. Salt and oxygen gas C. Salt and water D. Acid and base

Q8.What is the nature of non-metallic oxides?

A. Basic B. Acidic C. Neutral D. Amphoteric

Q9.What is produced when a non-metallic oxide reacts with a base?

A. Acid and water B. Salt and hydrogen gas C. Salt and water D. Base and oxygen

Q10.Which of the following is identified as a base in the provided text?

A. Carbon dioxide B. Hydrochloric acid C. Calcium hydroxide D. Sulphuric acid

Sign in with Email

Science Practice Quiz 15