The presence of ammonia gas in a desiccator can exclusively be removed by
phosphorus (V) oxide
fused calcium chloride
calcium oxide
concentrated tetraoxosulphate (VI) acid
Correct answer is D
Ammonia gas can be removed from a dessicator by adding a conc. H2SO4 so as to neutralize it since ammonia gas is basic.
The collision theory explains reaction rates in terms of
size of the product
frequency of collision of the reactants
size of reactant
frequency of collision of the products
Correct answer is B
Collision theory is the theory used to predict the rates of chemical reactions, particularly for gases. The collision theory is based on the assumption that for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another.
The end products of burning a candle in the atmosphere are water and
carbon (II) oxide
sulphur (IV) oxide
carbon (IV) oxide
sulphur (VI) oxide
Correct answer is C
When we ignite a candle, the hydrocarbon reacts with oxygen (in excess) to produce carbon dioxide and water. The burning sets an air current which gives dome shape to candle flame and it helps to get complete combustion at the bottom and the outer surface of the flame.
CO\(_2\) is produced
left and equilibrium constant decreases
left and equilibrium constant increases
right and equilibrium constant increases
right and equilibrium constant decreases
Correct answer is A
This is typical of what happens with any equilibrium where the forward reaction is exothermic. Increasing the temperature decreases the value of the equilibrium constant. Where the forward reaction is endothermic, increasing the temperature increases the value of the equilibrium constant. Endothermic reaction has a Positive Enthalpy change. Exothermic reaction has a negative enthalpy change.
3.30
13.00
10.70
11.30
Correct answer is A
PH+POH=14
p\(^{H}\) = Log [H\(^+\)]
p[H\(^+\) ] = 2.0 X 10\(^{-11}\)moldm\(^{-3}\)
p\(^{H}\) = Log [2.0 X 10\(^{-11}\)]
p\(^{H}\) = 10.70
10.70+ p\(^{OH}\) =14
p\(^{OH}\) = 14 -10.70
= 3.30