Question : What is the correct formula for calcium hydroxide?
Option 1: CaOH
Option 2: Ca(OH)4
Option 3: Ca(AlOH)4
Option 4: Ca(OH)2
Correct Answer: Ca(OH)2
Solution : The correct option is Ca(OH)2.
The correct chemical formula for calcium hydroxide is Ca(OH)2. It has one calcium (Ca) ion and two hydroxide (OH-) ions. In this ionic compound, the calcium ion has a positive two charge (Ca2+), and each hydroxide ion carries a negative one charge (OH−). The combination of one calcium ion and two hydroxide ions results in a neutral compound.
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Question : What is the chemical formula for the aldehyde group?
Option 1: –COOH
Option 2: –OH
Option 3: –CH2O
Option 4: –CHO
Question : What is the name of the 1,3-isomer (or meta-isomer) of benzenediol with the chemical formula C6H4(OH)2?
Option 1: m-Cresol
Option 2: Resorcinol
Option 3: Catechol
Option 4: Glycerol
Question : What is the chemical formula of "quartz"?
Option 1: SiO3
Option 2: SiO5
Option 3: SiO
Option 4: SiO2
Question : Which of the following is the formula of barium peroxide?
Option 1: Ba2O2
Option 2: BaSO4
Option 3: BaO
Option 4: BaO2
Question : Copper substances when exposed to air, gain a green coating due to the formation of:
Option 1: CuO
Option 2: CuCO3.Cu(OH)2
Option 3: CuSO4
Option 4: Cu(NO3)2
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