A solution of colourless salt H boiling with excess NaOH produces a non-inflammable gas. The gas evolution ceases after sometime. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salts (H) can be

The identity of the cation and anion in a salt are investigated using the experimental instructions and the following results are obtained:a colourless gas is evolved when the salt is treated with concentrated nitric acidno precipitate is obtained when the solution resulting from this is further treated with concentrated hydrochloric acidNo precipitate is obtained when the dissolved salt is reacted with 2-2'-bipyridine solution and no blood red solution forms on reaction with a thiocynate (SCN) solutionA flame test reveals a dull brick red colourWhat is the salt?Group of answer choicesFeCO3Ag2CO3CaCO3CaCl2

A colorless aqueous solution contains nitrates of two metals, X and Y. When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue P and a solution Q. The residue P was soluble in aq. NH3 and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are4 pointsAg and PbAg and CdCd and PbCd and Zn

Another student was given a pale violet solid. He was told that it contained two cations (positiveions) from this listLi+ Ca2+ Fe2+ NH+4 Fe3+He performed a flame test on the solid.He then dissolved a small sample of the solid in water, a yellow solution was formed.He added sodium hydroxide solution and then warmed the mixture.The table shows his observations.Test Observationflame test no positive resultadd sodium hydroxide solution and warm brown precipitatea pungent - smelling gas was evolvedthe gas turned damp red litmus paper blue(i) The flame test gave no positive result.State the two cations from the list that are not present in the solidand(ii) Identify the pungent - smelling gas given off and explain why the red litmus paper must bedamp before it is used.(iii) Identify the two cations present in the pale violet solidand5. Some iron (II) sulfate (FeSO4) is dissolved in water to make a solution.(a) A reaction takes place when sodium hydroxide solution is added to a solution of iron (ⅠⅠ) sulfate.(i) Complete the word equation to show this reaction(ii) State what you would observe in this reaction._______________________________________________________________________________________________________________(b) Barium chloride is used to test for sulfate ions.(i) Barium chloride solution is added to another solution of iron (ⅠⅠ) sulfate. A whiteprecipitate forms. Identify the white precipitate.________________________________________________________________________________________________(ii) In this test, another substance should be added to react with any carbonate ions thatmight be present. Identify this other substance and state one observation that would be madeif carbonate ions were present.Other substance ___________________________________Observation __________________________________________________________________________________(C) A compound with the formula (NH4 )2Fe(SO4)2 gives the same results in the tests in parts (a)and (b) as iron (ⅠⅠ) sulfate (FeSO4). Describe how you could show that a solution of (NH4)2Fe(SO4)2contains ammonium ions.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

The addition of dilute NaOH to a sample followed by heating evolved a gas, which turned redlitmus paper to blue. This reveals that the compound is likely to beA. an unknown compound of a gasB. an aldehydeC. an amideD. none of the aboveAn evolved gas that is neutral to litmus paper is likely to beA. carbon dioxide gasB. ammonia gasC. chlorine gasD. oxygenAn example of a choking gas is------------A. carbon monoxide gasB. oxygen gasC. nitrogen gasD. ammonia gasThe general formula for carboxylic acid isA. RCOB. RCOOC. RCOOOD. RCOOHEthanoic acid is the same as------------A. acetic acidB. methaneC. propaneD. acetoneEthanol is a compound that belongs to the family ofA. alkanoic acidsB. aldehydesC. alkanolsD. none of the aboveAkinade was given some ethanol in a small vial. She added 2 cm3 of ethanoic acid and a few dropsof concentrated H2SO4. On heating, he observedA. a pungent smellB. a choking smellC. no smell was given offD. a pleasant fruity smell

When concentrated H2SO4𝐻2𝑆𝑂4 is added to NaCI (s), the gas evolvedA. bleaches damp blue litmus paperB. forms a white preciptate with AgNO3(aq)C. forms a white precipitate with BaCI2(aq)D. turns moist red litmus paper blue