(a) Three elements A, B and C have atomic numbers 8, 11 and 12 respectively.

(i) Write the formula of the compound formed by the chemical combination of A and B.

(ii) State which of the three elements belong(s) to the s-block of the Periodic Table. Give reason for your answer:

(b) List the component elements of bleaching powder.

A bar of initial length /₀ is heated through a temperature change \(\Delta\)t to a new length I. The linear expansivity, a, of the bar is

• A. \(\frac{/ - /_o}{/ \Delta t}\)
• B. \(\frac{/ - /_o}{/_o \Delta t}\)
• C. /_o(1 + \(\Delta\) t)
• D. \(\frac{/ - /_o}{/(1 + \Delta t)}\)

Which of the following gases is the most dangerous pollutant?

• A) Hydrogen sulphide
• B) Carbon (IV) oxide
• C) Sulphur (IV) oxide
• D) Carbon (II) oxide

In question below fill the gap with the appropriate option: A survey of opinions on how pupils feels about their teachers .... carried out

• A. has been
• B. have been
• C. are being
• D. is been

The diameter of a bicycle wheel is 42cm. If the wheel makes 16 complete revolution, what will be the total distance covered by the wheel? [Take \(\pi = \frac{22}{7}\)

• A. 672cm
• B. 1056cm
• C. 2112cm
• D. 4224cm

The delegation from Antioch to the Council of Jerusalem compromised

• A. Paul and Peter
• B. Peter and James
• C. Paul and Barnabas
• D. John and Silas

The figure “O O” is a representative of the figures “ X X”. How many such figures are between the numbers 10 and 100

• A. 0 0
• B. 90
• C. 9
• D. 19

Fill each gap with the most appropriate option from the list provided.

The reason why he was not offered admission was ...... his results could not be found?

• A. that
• B. when
• B. when C. owing to
• D. because

Find the mean deviation of these numbers 10, 12, 14, 15, 17, 19.

• A. 2.5
• B. 2.6
• C. 2.7
• D. 2.8

Which of the following is a perverted form of democracy?

• A. Feudalism
• B. Republicanism
• C. Monarchy
• D. Oligarchy