Inorganic Chemistry Answers

I have point group D2h ,, for 1-4 dichlorobenzene , I want to reduce the 3N representation for this

Can electrolysis be performed on aluminium oxide without the presence of carbon at its melting point?

-5.95g of cobalt(II) carbonate were added to 40cm3 of hydrochloric acid, concentration 2.0mol/dm3
.
I] Calculate the maximum yield of cobalt(II) chloride-6-water and show that the cobalt(II) carbonate was in excess.

CoCO3 + 2HCl → CoCl2 + CO2 + H2O
CoCl2 + 6H2O → CoCl2.6H2O

} maximum yield:
} number of moles of HCl used =
} number of moles of CoCl2 formed =
} number of moles of CoCl2.6H2O formed =

} mass of one mole of CoCl2.6H2O = 238g
}maximum yield of CoCl2.6H2O = …………………………………………………..…..…g
to show that cobalt(II) carbonate is in excess:
number of moles of HCl used = ……………………….……… (use your value from above)

mass of one mole of CoCO3 = 119g

number of moles of CoCO3 in 5.95g of cobalt(II) carbonate = …………………………

(ii) Explain how these calculations show that cobalt(II) carbonate is in excess.

What if I have dissolved 10g of Hydroxyapatite in propanol and I want to adjust pH by adding nitric acid, then will the particles of Hydroxyapatite react with acid in this case? I have a doubt that it might depend on the mass of particle.

calculate the no. of unpaired electrons in O2- and O2^2- ions by drawing molecular orbital diagram.

Question 16 : Which of these is not a component of lead-acid battery?
lead chloride
Tetraoxosulphate(VI) acid
lead oxide
spongy lead

Question 17 : Flourine has all but one of these properties
it is the strongest oxidising agent in the whole group
The oxidation state of is -1
The size is larger than the other halogens
It can oxidise all the other halide ions to their respective elements

Question 18 : Fluorine reacts with alkalies to yield------------
the hypohalite
the salt
the oxide
the acid

Question 19 : Nitrogen is obtained commercially from
coke
water vapour
rock
air

Question 20 : Which of these halogens does not form oxoacids ?
Flourine
Iodine
Bromine
Chlorine

Question 11 : PVC pipes are manufactured using
Flourine
Iodine
Bromine
Chlorine

Question 12 : Which of these statements is not true of halogens ?
They are only one electron short of the noble gas configuration
Fluorine is the strongest oxidising agent in the whole group
They form the cation X+
The bond in interhalogen compounds is polar

Question 13 : Compounds formed by the interaction of one halogen with other halogens are called ------------
pseudo halogens
polyhalogens
interhalogens
Polyhalides

Question 14 : Which of these halogen oxides is useful in the estimation of CO
Flourine
Chlorine
Iodine
Bromine

Question 15 : Which of these statements is not true of group V elements ?
antimony is a metalloid
Nitrogen exists as a diatomic molecule
Phosphorus exits both in gaseous and solid forms
bismuth is predominantly non- metallic in nature

Question 6 : Which of these is not a group V element?
Calcium
Nirogen
Arsenic
Phosphorus

Question 7 : Halogen means-------------
reducing agent
oxidizing agent
bleaching agent
salt producer

Question 8 : Nitrogen is used for all but one of the following
freezing of foodstuffs
freeze grinding of normally soft and rubbery materials
in making fire works
in the packaging of processed foods

Question 9 : Deficiency of one of these leads to goitre in humans
Flourine
Iodine
Chlorine
Bromine

Question 10 : One of these statements is not true of oxides of halogen.
All oxides of halogens have positive free energies of formation
Chlorine oxides are used as bleaching agents
Except for that of iodine all oxides tend to be explosive
The higher oxides tend to be more stable than the lower

Question 1 : Teflon is form from a derivative of-------------
Chlorine
Iodine
Bromine
Flourine

Question 2 : The thermal stability of hydrogen halides-------------------
has no fix pattern across the group
is constant across the group
decreases from HF to HI
increases from HF to HI

Question 3 : Which of these halogens shows no basic properties
Flourine
Bromine
Chlorine
Iodine

Question 4 : A derivative of ------------- is used in making photographic plates
Flourine
Iodine
Bromine
Chlorine

Question 5 : One of these is not a pseudo halogen.
Teflon
selenocyanogen
cyanogen
thiocyanogen

Question 16 : Which of these is true of interstitial carbide?
they are non stoichiometric compound
they are soluble compounds
They are binary compounds
they are amorphous compounds

Question 17 : Lead dioxide is used as ----
anti knock
dentoator
gun powder
bleach

Question 18 : Which of the group V oxoacids is manufactured by Ostwald process?
nitric acid
nitrous oxide
dinitrogen tetraoxide
nitrogen hydroxide

Question 19 : Which of the group V metals can not be obtained from its sulphide ore?
lead
Bismouth
phosphorus
Nitrogen

Question 20 : Which of the following is responsible for the easy hydrolysis of lead halides ?
availability of lone pair of electron in P orbital
completely filled d orbitals by electron
Availability of d-orbitals and low bond energy of Pb-H bond
availability of lone pair of electron in d orbital