Hydrocarbons which react with ammoniacal copper (l) chloride solution conform to the general molecular formula

• A. C_nH_2n
• B. C_nH_2n+1
• C. C_nH_2n+2
• D. C_nH_2n-2

When the trioxonitrate (IV) salt of an alkali metal Y is heated, the formula of the residue is

• A. Y₂O
• B. YNO₂
• C. Y₂O₃
• D. Y (NO₂)₂

The least easily oxidized of the metals below is

• A. Ca
• B. Na
• C. Zn
• D. Al

Helium is preferred to hydrogen in filling balloons because hydrogen

• A. is inflammable
• B. is diatomic
• C. exhibits isotopy
• D. is a component of water

The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence in them of

• A. carbon (IV) oxide
• B. carbon (II) oxide
• C. soda
• D. glucose

The products of the electrolysis of dilute sodium chloride using carbon electrodes are

Anode Cathode

• A. chlorine and sodium.
• B. oxygen and hydrogen.
• C. chlorine and hydrogen.
• D. hydrogen and oxygen.

Wrought iron is obtained by heating cast iron in a furnace with?

• A. magnetite
• B. haematite
• C. carbon(ii)oxide
• D. calcium trioxosilicate(iv)

In the laboratory preparation of chlorine from concentrated hydrochloric acid in the presence of potassuim tetraoxomanganate(VII) the produced is dried by passing it through

• A) Concentrated tetraoxosulphate (VI) acid
• B) Anhydrous calcium chloride
• C) Calcium oxide
• D) Sodium hydroxide

A given mass of gas occupies 2dm³ at 300K. At what temperature will its volume be doubled keeping the pressure constant?

• A) 400K
• B) 480K
• C) 550K
• D) 600K

Isotopes are atoms if the same element with ________

• A) different protons
• B) mass above 50
• C) inter convertible masses
• D) different masses