Which one of the following is not a mixture?
Air
Mercury
Milk
Cement
Correct answer is B
A mixture is a material made up of two or more different chemical substances which are not chemically combined.
Mercury is a chemical element with the symbol Hg and atomic number 80.
A 'breath test' used by traffic police to check drunken driving uses?
Tumeric on filter paper
Silica gel coated with saliva nitrate
Potassium permanganate-sulphuric acid
Potassium dichromatic-sulphuric acid
Correct answer is D
The earliest developed breathalyzer was based on reaction of alcohol if present in the exhaled air with a cocktail of chemicals containing sulfuric acid, potassium dichromate, silver nitrate, and water. Silver nitrate catalyzes the reaction between alcohol and potassium dichromate in acidic medium.
What is the chemical name for the compound CuCO\(_{3}\)?
Copper (iii) carbonate
Copper (ii) carbonate
Copper (i) carbonate
Copper
Correct answer is B
Copper(II) carbonate or cupric carbonate is a chemical compound with formula CuCO\(_{3}\)
What is the IUPAC name for the following compound? HC\(\equiv\)CCH\(_{3}\)
Acetylene
Methyl acetylene
Butanol
Decanoic acid
Correct answer is B
Propyne (methylacetylene) is an alkyne with the chemical formula HC\(\equiv\)CCH\(_{3}\)
The scientist who stated that matter can be converted into energy is?
Boyle
Lavoiser
Avogadro
Einstein
Correct answer is D
The principle described by the physicist Albert Einstein's famous formula: E = mc^2, involves mass–energy equivalence.
I.e. the relationship between mass and energy.