Question 1 : The possible bond holding precipitation together when inorganic precipitating reagents are added include�?�..?
A. Covalent bond
B. Induced dipole-dipole force
C. London force of attraction
D. Ionic bond
Answer is D Ionic Bond
Question 2 : Which of the statements best define charcoal?
A. Charcoal is an energy source for cooking
B. Charcoal is a purifying agent
C. Charcoal is a fossil fuel
D. An amorphous carbon form from the incomplete combustion of animal or vegetable matter
Answer is D. An amorphous carbon form from the incomplete combustion of animal or vegetable matter
Question 3 : Give two common examples of inorganic precipitating agent
A. Silver nitrate and chloride ions
B. Barium chloride and ammonia hydroxide
C. Potassium and barium chloride
D. Silver nitrate and barium chloride
Answer is D. Silver nitrate and barium chloride
Question 4 : During recrystallization, the blockage of the filter funnel can be avoided by
A. Dissolving the crude solid into the solvent in the normal way
B. Filtering only hot solution
C. A further adding a small quantity of solvent.
D. None of the above
Answer is C. A further adding a small quantity of solvent.
Question 5 : Gravimetric analysis can be generalized into�?�..?
A. Precipitation and volatization
B. Precipitation and titration
C. Volatilization and ionization
D. Volatilization and titration
Answer is A. Precipitation and volatization
Question 6 : The volatile combustible matter (VCM) of a charcoal indicates�?�?
A. The coke yield on the carbonation process
B. Bases for purchasing or selling quality of the charcoal
C. The combustion characteristic of the material
D. All of the option above
Answer is C. The combustion characteristic of the material
Question 7 : The weight loss of charcoal upon heating is its�?�?
A. Absorption capacity
B. Moisture content
C. Water content
D. Water of hydration
Answer is B. Moisture content
Question 8 : On heating a copper sulphate crystal, a colour change from blue to white was observed and the blue colour reappears again upon cooling the crystals in an open container. Which of these best describes what happen to the crystals?
A. The blue crystal is purified on heating
B. The crystal was disintegrated into copper ions and sulphate ions
C. The water of hydration of the crystal was lost during heating and gained on cooling
D. The white crystal is the impure form of the copper sulphate crystal
Answer is C. The water of hydration of the crystal was lost during heating and gained on cooling
Question 9 : Which one of these substances is use as drying agent?
A. Hydrates substances
B. Hygroscopic substances
C. Efflorescence substances
D. Deliquescence substances
Answer is B. Hygroscopic substances
Question 10 : What are hydrates?
A. Amorphous substances that are bonded by water molecules
B. Crystalline salt that are bonded to water molecule in definite proportion
C. Substances that contain water bound to their structure
D. Crystalline salt that bonded to water molecules in indefinite proportion
Answer is B. Crystalline salt that are bonded to water molecule in definite proportion
Question 11 : A very important property of fuel is ..?
A. Its octane number
B. Its heat of combustion
C. Its density
D. Source of the fuel
Answer is B. Its heat of combustion
Question 12 : What is the name of a ring like product formed between a multi-dentate ligand and a cation?
Answer is C. Chelate
Question 13 : Mention one precaution to be taking when using activated charcoal.
A. The charcoal must be finely powdered
B. Only a small quantity of the charcoal should be used
C. The solution must be cold before adding the charcoal
D. The solution must be allowed to boil with the charcoal
Answer is C. The solution must be cold before adding the charcoal
Question 14 : Apart from their representation of large proportion world energy, fossil fuel are also used for manufacturing �?�..?
A. Plastics medicines and steel
B. Plastics rubber and ceramics
C. All fabrics and medicine
D. Plastics, synthetic fabrics and medicines
Answer is D. Plastics, synthetic fabrics and medicines
Question 15 : Sodium tetraphenylborate can be used to precipitate the following except�?�..?
A. Cecium ions
B. Sulphate ions
C. Potassium ions
D. Chloride ions
Answer is D. Chloride ions
Question 16 : The percentage of hydrated water can be calculated as, %H2O= (num. H2O molecules) molecular mass of hydrate divided by molecular mass of water X 100. True or false?
C. Incomplete equation
Answer is A. False
Question 17 : The bond formed between organic precipitating agent that contain carboxylic group and metallic ions solution is�?��?�?
A. London force of attraction
B. Ionic bond
C. Electrovalent bond
D. Covalent bond
Answer is D. Covalent bond
Question 18 : The products of precipitation are �?�?
Answer is B. salts
Question 19 : Indicate which one of these substances act similar to hydrates?
A. Deliquescence substance
B. Activated charcoal
D. Sodium chloride salt
Answer is A. Deliquescence substance
Question 20 : The weakly bonded water molecules are known as �?�?
A. Moisture content
B. Water of hydration and crystallization
C. Water of reaction
D. Hygroscopic content
Answer is B. Water of hydration and crystallization