Halogens generally react with metals to form

• A. alkalis
• B. acids
• C. bases
• D. salts

Calculate the mass of copper deposited if a current of 0.45A flows through CuSO₄ solution for 1hour 15mins. [Cu=64.0, S= 32.0, O =16.0, 1F= 96500C]

• A. 6.40g
• B. 0.67g
• C. 0.64g
• D. 0.45g

Potassium Chloride solid does not conduct electricity because

• Potassium Chloride solid does not conduct electricity because A. it is a covalent compound
• B. strong cohesive forces make its ions immobile
• C. strong cohesive force makes its molecule immobile
• D. each of potassium and chlorine structures contain noble gas structure

Chemical reactions occurs when the colliding reactants have energy that is

• A. less than the activation energy
• B. greater than the activation energy
• C. greater than the energy of the product
• D. less than the energy of effective collision

The purity of a solid sample can best be determined by its

• A. boiling point
• B. melting point
• C. conductivity
• D. solubility

When water was added to a white anhydrous substance X, the colour changed to blue. X is

• A. CuSO₄
• B. FeSO₄
• C. Na₂SO₄
• D. PbSO₄

The following glasswares are used to measure the volume of liquids EXCEPT

• A. graduated beaker
• B. pipette
• C. test tube
• D. burette

The property of a chemical reaction that is affected by the presence of a catalyst is

• A. activation energy
• B. free energy
• C. equilibrium position
• D. enthalpy change

The number of atoms present in 2.5moles of a triatomic gas is equivalent to [1mole = 6.02×10²³]

• A. 2.5×10²³
• B. 1.5×10²³
• C. 1.5×10²⁴
• D. 2.5×10²⁴

The condensation of two units of glucose will produce a dissacharide with the formula C12H22O11 which is

• A. sucrose
• B. maltose
• C. galactose D. mannose C. galactose
• D. mannose