Jamb 2017 Flashcards
Tincture solution are characterized by the presence of
Alcohol
Temporary hard water is formed when rain water
when rain water containing dissolved carbon(IV) oxide flows over deposits of CaCO3
CaCO3 + CO2 + H2O → Ca(HCO3)2
Permanent hardness in water=
Temporary hardness in water=
Permanent hardness in water= Mg & Ca Sulphate.
Temporary hardness in water= Mg & Ca Carbonate.
The acid anhydride that will produce weak acid in water is A. SO3 B. NO2 C. SO2 D. CO2
D
The process that occurs when two equivalent forms of a compound are in equilibrium is
Resonance
In the laboratory preparation of ethyl ethanoate, the water present in the mixture is removed using ?
Anhydrous CaCl2
When few drops of concentrated trioxonitrate(V) acid is added to an unknown sample and wanned an intense yellow colouration is observed. The likely functional group present in the sample is
A. NH2RCHCOOH
B. CHO
C. CO
D. CNH2
A
The ideal gas laws and equations are true for all gases at
Low pressure and high temperature
Tin is unaffected by air at ordinary temperature due to its
Lower melting point
Tin is relatively unaffected by both water and oxygen at room temperature due to its low melting point. It does not rust, corrode, or react in any other way. This explains one of its major uses: as a coating to protect other metals.
In the laboratory preparation of trioxonitrate (V) acid the nitrogen(iv) oxide formed as a by-product is removed by
Bubbling air through the acid solution
Due to the high reactivity of sodium, it is usually stored under
Paraffin
Paraffin is also known as Kerosene.
Na(sodium) is kept in kerosene to prevent it from coming in contact with oxygen and moisture. If this happens, it will react with the moisture present in air and form sodium hydroxide.
Ca(OH)2(s) + 2NH4Cl(s) → CaCl2(s) + 2H2O(l) + X. In the reaction above X is
Ammonia NH3
X(g) + 3Y(g) —- 2z(g) H = +ve. if the reaction above takes place at room temperature, the G will be
Negative
