Particle size of CuO(s)
Concentration of H2SO4(aq)
Temperature of the reacting mixture
Pressure of reaction system
Correct answer is D
The reaction rate between a solid and liquid will not be affected by pressure. Pressure majorly affects the reaction rate for gases.
A spot of oil paint on a shirt can best be removed using?
brine
detergent
kerosine
warm water
Correct answer is C
To remove oil paints, the use of chemicals is usually required, including turpentine, acetone, kerosene, and various paint thinners.
The hydrolysis of NH\(_4\)CI gives
an acidic solution
an alkaline solution
a buffer solution
a neutral solution
Correct answer is A
When you dissolve ammonium chloride crystals in water (H\(_2\)O), the ammonium chloride compound decomposes into its component ions: NH\(_4 ^+\) and Cl\(^-\). The reaction of these ions with water gives an acidic solution.
Which of the following pH values indicates that a solution is a strong base?
1
5
9
13
Correct answer is D
No explanation has been provided for this answer.
On heating, the following trioxocarbonate (IV) salts decompose to give solid residue except
ammonium trioxocarbonate (IV)
calcium trioxocarbonate (IV)
lead (ll) trioxocarbonate(IV)
zinc trioxocarbonate (IV)
Correct answer is A
Ammonium trioxocarbonate (IV) is an unstable compound. It decomposes on heating to yield ammonia, carbon (IV) oxide and water. All of these are gases.