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.
A substance L reacts with NH\(_4\)NO\(_{3(aq)}\) to generate ammonia gas. L is likely to be
HCl
NaOH
CH3COOH
CaSO4
Correct answer is B
The reaction between NH\(_4\)NO\(_{3(aq)}\) and any metal hydroxide produces ammonia, water and an alkali metal nitrate.
The energy evolved when magnesium burns in air is in the form of
heat
heat and sound
light and heat
sound
Correct answer is C
When a piece of magnesium ribbon is ignited, light and heat are produced.The reaction is an exothermic reaction, as well as one that produces light energy.
CI2
H2
He
O2
Correct answer is A
According to Graham's law of diffusion and effusion,
r \(\propto\) \(\sqrt{\frac{1}{M}}\).
Therefore, the more the molar mass, the less the rate of diffusion and effusion.