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what is meant by covalency valence explain with example and oxygen has covalency of 2 while sulphur has covalency up to
in oxygen cylinder there is helium also filled with oxygen why not nitrogen is filled in place of
classify as to what type of chemical reaction each one belongs1 h2co3 rarr h2o co22 c6h1o6 rarr 12c 11 h2o3 cdcl2
in group 16 since the electronegativity decreases so tendency to exhibit -2 oxidation state decreases as we go down the
the process to remove chromate 3so2 2cro4 2- 4h 2 cr3 3so4 2- h2o in a completely mixed reactor has reached
are acetic acid ethyl alcohol vinegar sodium hydroxide ammonium hydroxide and hydrochloric acid soluble and flammable
why does the ionisation of two or more electrons from an atom of a transition element take place with the removal of s
a patient took some tablets containing magnesium oxide to relieve his gastric pain which was caused by excess
it is your first day of work in your new laboratory job you are asked to prepare 700 ml of pbs phosphate buffered
in the following neutralization reaction between an acid and base hydrochloric acid aq sodium hydroxide aq write the
a procedure similar to that described in this experiment can be used to precipitate cl- as agcl a sample containing
in a typical titration experiment a student titrates a 500ml sample of formic acid with 2659 ml of 01088 m naohat this
1 234g of sodium chloride was dissolved in 250cm3 of water what is the concentration of the sodium chloride solution in
calculate the equilibrium concentration of nh3cu2 cunh32 cunh322cunh332andcunh342 in a solution made by mixing 5000 ml
the chemical equation below shows the complete combustion of propane c3h8c3h8 g 5o2 g --gt 4h2og 3co2 gwhat is the
hydrochloric acid and magnesium carbonate react according to the following equation2hclmgco3--gt mgcl2h2oco2a when 084g
calculate the molar mass of a compound from the following information you find that the freezing point of benzene is 55
the enthalpies of combustion of ethene ethane and hydrogen are -1390 kj mol -1550 kj mol and -286 kj mol respectively
1the pages of a book are numbered 1 to 200 and each leaf is 010mm thickif each cover is 020mm thickwhat is the
when sulphur burns in air it produces sulphur dioxidei is this reaction an exothermic or endothermicii out of the
given the reaction18 g of 2-phenoxyaniline with 16g of 24-dimethoxybenaldehyde dissolved in 25 ml of ethanol and was
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a sample of kcio3 weighing 455g is strongly heated all of the oxygen gas given off is collected over water in a flask
a service laboratory has several chemicals available for the preparation of buffer solutions acetic acid barbituric
what volume of 200 m naoh must be added to 3000 ml of 100 m glycolic acid to produce a buffer solution having a ph of