\(^{226}_{88}Ra\) → \(^x_{86}Rn\) + alpha particle
226
220
227
222
Correct answer is D
\(^{226}_{88}Ra\) → \(^x_{86}Rn\) + \(^4_{2}He\)
\(^4_{2}He\) = alpha particle
considering the summation of the mass number
226 = x + 4
x = 226 - 4
x = 222
When ΔH is negative, a reaction is said to be
endothermic
exothermic
reversible
ionic
Correct answer is B
When ΔH is negative, heat is liberated to the surrounding and it connotes an exothermic reaction.
ΔH = −ve
The ideal gas laws and equations are true for all gases at
low pressures and lower temperatures
low temperatures and high pressures
high pressures and high temperatures
low pressure and high temperatures
Correct answer is D
At high temperature and low pressure, the vanderwaal equation is reduced to ideal gas equation.
i.e, [P + \(\frac{a}{v^2}\)] [v - b] = RT is reduced to PV = nRT
Generally, a gas behaves more like an ideal gas at higher temperature and lower pressure as the potential energy due to intermolecular forces, it becomes less significant compared with the particles kinetic energy and the size of the molecules, then it becomes less significant compared to the empty space between them.
The salt formed from a weak acid and a strong base hydrolyzes in water to form
A saturated solution
an acidic solution
a buffer solution
an alkaline solution
Correct answer is D
This is a solution formed from the hydrolyses of an alkali in water.
Incomplete oxidation of ethanol yields
CH3COOH
CH3COCH3
CH3CH2OCH2CH3
CH3CHO
Correct answer is D
C2H5OH → CH3CHO → CH3COOH
Ethanol.....oxidation Ethanal........Ethanoic Acid
Primary alcohol oxidises to aldehyde and later to carboxylic acid.
Secondary alcohol oxidises to ketones.
Ethanol is an example of primary alcohol and primary alcohol can be oxidised to aldehyde and carboxylic acid. Wherein, incomplete oxidation of primary alcohol yields aldehyde also known as alkanal while complete oxidation of primary alcohol yields carboxylic acid.