1.) Which of the following metals forms an amalgam with other metals?

A. Tin                                B. Mercury

C. Lead                              D. Zinc

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2.) Water gas is prepared by passing __

(A) Steam over white hot coke
(B) Air over red hot coke
(C) Methane over red hot coke
(D) Steam over heated sulphur

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3.) Heavy water is ___

(A) Tritium oxide                   (B) Deuterium oxide
(C) Rain water                     (D) Water at 4°C

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4.) The gases used in different types of welding would include __

(A) Oxygen & Hydrogen        (B) Oxygen, acetylene & argon
(C) Oxygen & acetylene       (D) Oxygen, hydrogen & nitrogen

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5.) Which of the following gases is lighter than air?

(A) Carbon dioxide               (B) Oxygen
(C) Ammonia                        (D) Chlorine

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6.) What is laughing gas?

(A.) Nitrous Oxide               (B.)     Carbon monoxide

(C.) Sulphur dioxide            (D.)    Hydrogen peroxide

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