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

A gas evolved while applying heat to a chemical reaction, which turns blue litmus paper red islikely to be--------------A. carbon dioxide gasB. oxygen gasC. ammonia gasD. none of the above

Which of the following when put in water turns red litmus paper blue?A.KClB.NaNO33​ C.NaD.Na22​ SO44​

A compound P is taken in a flat bottomed flask as shown in figure. Dilute hydrochloric acid is added drop by drop. A gas Q is evolved which is then passed in a test tube containing R. A solid precipitate S is formed. R is frequently used in white washing. During white washing a layer of R is applied on the wall and it reacts with gas Q (present in air) to produce white shiny layer of S on the wall. P, Q, R and S respectively are :  P Q R S(1) Na2SO4 SO2 Ca(OH)2 CaSO4(2) Na2SO3 O2 Ca(OH)2 CaO(3) Na2CO3 O2 Ca(OH)2 CaCO3(4) Na2CO3 CO2 Ca(OH)2 CaCO31234

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

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.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________