Answer:
option (d) is false.
Explanation:
Acid dissociation equilibrium of HCN is represented as-
Acid dissociation constant, 
, is represented as-
![K_{a}=\frac{[H^{+}][CN^{-}]}{[HCN]}](https://tex.z-dn.net/?f=K_%7Ba%7D%3D%5Cfrac%7B%5BH%5E%7B%2B%7D%5D%5BCN%5E%7B-%7D%5D%7D%7B%5BHCN%5D%7D)
where species inside third bracket represents equilibrium concentrations of respective species
So, evidently, presence of excess 
(or NaCN) in solution will combine with 
to produce HCN. Hence will be larger that it would be if only the HCN solution were present.
According to Le-chatlier principle, addition of HCN will shift equilibrium towards right and addition of NaCN will shift equilibrium towards left to keep constant value at a particular temperature.
NaOH gives acid-base reaction with HCN to produce NaCN and water. So, addition of NaOH will increase concentration of and decrease concentration of HCN
Answer is in the photo. I can only upload it to a file hosting service. link below!
linkcutter.ga/gyko
Explanation:
No of molecules=0.500×6.023×10²³=3.011×10²³ molecules
No, some impurities may alter the observed effects of a chemical reaction.. during a reaction other products may be produced, they may alter the MP or BP of the pure substance.
Answer:
He has two protons
Li electron has one electron in its outermost orbital.
Number of neutrons of nitrogen = seven neutrons
The second shell of boron: 3 electrons.
Explanation:
An atom is composed of electrons, protons and neutrons. The number of neutrons is determined by subtraction of the atomic number from the mass number.
The electronic configuration is already known for each of atoms in these questions according to standard tables.
