Past Questions And Answers
Which of the following features could be used to determine the growth of a seedling?
- A. Number of flowers
- B. Number of leaves
- C. Length of flowers
- D. Length of radicle
Which of the following statements is/are true for finding a median? I. Always search for the middle number II. Always arrange in increasing or decreasing order before searching for the middle number III. Once arranged, if the set has an even number, just take the two middle numbers and subtract them and divide by two IV. Once arranged, if the set has an even number, just take the two middle numbers and add them and divide by two
- A. II, III
- B. I only
- C. II, IV
- D. I, II, IV
A market in which a single price obtains for a product is known as
- A. a product market
- B. a capital price market
- C. an imperfect market
- D. a perfect market
The part of the kidney where each tubule begins is called
- A) Capsule
- B) Cortex
- C) Glomerulus
- D) Urether
Jesus selected the twelve disciples in order to
- A. Represent the Church
- B. Make them his bodyguards
- C. Act like other Jewish teachers
- D. Train them to carry on after his departure
a. Starting with calcium chloride, describe briefly how a solid sample of calcium trioxocarbonate (IV) can be prepared in the laboratory.
b. With relevant equations outline the procedure for the purification of impure copper.
c. Copper reacts with concentrated trioxonitrate (V) acid: i. write a balanced chemical equation for the reaction;
ii. state what would be observed in the reaction,
iii. state why the copper is oxidized;
iv. an excess of copper is added to 25.0 \(cm^3\) of 16.0 mol \(dm^3\) \(HNO_3\). Calculate the volume of the gas formed at s.t.p. [H=1.0, N=14.0, O= 16.0, Cu=63.0; Molar volume of gas at .s.t.p.=22.4 \(dm^3\)]
di. Pure \(HNO_3\), is a colourless liquid but when exposed to air, it turns yellowish-brown in colour. Explain briefly this observation.
ii. Write a balanced equation for the laboratory preparation of hydrogen trioxonitrate (V) acid.