Q)What is used for heating small amounts of solids at a high temperature? a) Mortar and pestle b) Evaporating dish c) Crucible and cover d) Clay triangle
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Q)What is used for heating small amounts of solids at a high temperature?
a) Mortar and pestle
b) Evaporating dish
c) Crucible and cover
d) Clay triangle
Q)Which of the following is used in separation techniques?
a-Rubber policeman
b-Graduated cylinder
c-Volumetric flask
d-Filter paper
Q)Which of the following describes a centrifugate?
a-Always clear
b-Supernatant liquid
c-Discarded via decantation only
d-Solid particles
QThe inward force that pulls substances towards its center is called .
a-Gravitational force
b-Centrifotal shift
c-Continental shift
d-Centrifugal force
QA "slippery floor" is considered a .
a-hazard
b-risk
c-flash point
d-toxicant
Q)Mrs. Lily Potter is 24 weeks pregnant. She was exposed to a chemical while making a potion. What is the type of the chemical she should be avoiding?
a-neurotoxicant
b-asphyxiant
c-teratogen
d-carcinogen
Q)Which of the following should be observed when handling liquid nitrogen?
a-Use special gloves in handling the chemical
b-Store at room temperature
c-Only those with proper training should handle it
d-Should be stored together with the cryoscopics
Q)What is/are the advantage/s of using the tapered test tubes in the ion analysis over an ordinary tube?
a-It is durable and cheaper
b-It magnifies the size of the precipitate
c-It is used for quantitative test rather than qualitative
d-It has a 5 ml capacity
Q)The reduction in volume by heating a solution is best accomplished by using
a-crucible with cover
b-conical test tube
c-watch glass
d-porcelain casserole
Q)The complete precipitation of Cations I is carried out by adding which chemical/s?
a)3F Hydrochloric acid
b)diluted HCl
c)3N Hydrochloric acid
d)Potassium hydroxide
Q)After the treatment of an acid to an unknown solution of cations, a few drops of NH3 was added after centrifugation. A black precipitate indicates the presence of which ion?
a-Lead ion
b-Mercuric ion
c-Mercurous ion
d-Silver ion
Q)A complete separation of lead chloride from the group precipitation is effected with the utilization of .
a-evaporation of the solution
b-hot water bath
c-introduction to cold environment
d-addition of ammonia
What is the ratio of the acid for the preparation of Aqua Regia?
3 parts HCl: 3 parts of HNO3
1 part HCl: 1 part of HNO3
3 parts HCl: 1 part HNO3
1 part HCl: 3 parts HNO3
ese are the composition of potassium stannite that forms a white gelatinous precipitate after preparation.
few drops of stannous chloride
6F potassium hydroxide
few drops of 3F stannic chloride
diluted potassium hydroxide
This label on a chemical container signifies that
the chemical is safe
the hazard can cause serious injury
users have to be careful when using, handling and storing of chemicals
the chemical is highly flammable
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