Post Utme Chemistry Questions
Question 216:
The \(pH\) of lour solutions \(W , X , Y , Z\) are \(4,6,8,10\), respectively therefore
- A None of these solutions is acidic
- B The \(pH\) of \(Y\) is made more acidic by addition of distilled water
- C \(Z\) is the most acidic solution
- D \(W\) is the most acidic solution
- E \(X\) is neutral
Question 217:
Which of the following contains two amphoteric oxides?
- A Sodium oxide, Zinc Oxide, Magnesium oxide
- B Aluminum oxide, calcium oxide, Zinc oxide
- C Potassium oxide, lithium oxide, Carbon dioxide
- D Silver oxide, Lead oxide, Sodium oxide
- E Sulphur dioxide. Aluminum oxide, Carbon monoxide
Question 218:
\(50 cm ^{3}\) of hydrogen are sparked with \(20 cm ^{3}\) of oxygen at \(100^{\circ} C\) and 1 atmosphere. <br/>The total volume of the residual gases is ____________
- A \(50 cm ^{3}\)
- B \(10 cm ^{3}\)
- C \(40 cm ^{3}
- D 30 cm ^{3}\)
- E \(70 cm ^{3}\)
Question 219:
When ammonium, potassium and Calcium carbonates are each separately heated
- A Non of them will decompose
- B Each of them will decompose to give carbondioxide and the respective oxide
- C Ammonium carbonate and potassium carbonate will not decompose
- D Only ammonium carbonate and calcium carbonate will decompose to carbon dioxide and the respective oxide
- E Ammonium carbonate will decompose to glycocarbon dioxide, water and ammonia
Question 220:
\(500 cm ^{3}\) oxygen was collected over water at \(30^{\circ} C\) and \(752 mmHg\) pressure. What is the volume of dry oxygen at STP? <br/>(Vapour pressure of water at \(30^{\circ} C =32 mmHg\) )
- A \(475 cm ^{3}\)
- B \(415 cm ^{3}\)
- C \(586 cm ^{3}\)
- D \(500 cm ^{3}\)
- E \(427 cm ^{3}\)