Genius Jnr - Rajni carried out some reactions in her chemistry lab. Element Reaction with warm HCl Reaction with H2SO4 Magnesium Yes Yes Copper Yes Yes Carbon No No However, she did not note her observations at the same time and forgot some of the results. She then showed her observations to her teacher, who pointed out an error. Which of Rajni’s observations is incorrect?

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Rajni carried out some reactions in her chemistry lab.

Element	Reaction with warm HCl	Reaction with H₂SO₄
Magnesium	Yes	Yes
Copper	Yes	Yes
Carbon	No	No

However, she did not note her observations at the same time and forgot some of the results. She then showed her observations to her teacher, who pointed out an error. Which of Rajni’s observations is incorrect?

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Hydrochloric Acid Explain Limita Element Reacts Oxygen Form Oxide Dissolves Dilute Hydrochloric Acid Resulting Solution Turns Colour Following Compositions Correct Composition Thermite Following Mixtures Used Ignition Mixture Thermite Welding Following Compositions Correct Composition Stainless Steel Following Metals Constituent Duralumin Alloy X Obtained Mixing Zinc 40 30 Copper 60 70 Used Making Electric Switches Statues Utensils Ammun Following Alloys Alloy Copper Following Alloys Iron Contain Carbon Three Metal Pieces X Z Taken Cleaned Sand Paper Separately Put Test Tubes Ii Iii Respectively Contai Observed Solution Sodium Sulphate Added Solution Barium Chloride Taken Test Tube Write Equation Chem Four Students P Q R Noted Initial Colour Solutions Kept Beakers Ii Iii Iv Inserting Zinc Rod Solutio Consider Following Table Metal Snso4 Pbso4 Hgso4 Baso4 Sn Displaced Displaced Reaction Pb Reaction D Red Brown Metal X Forms Salt Xso4 Hydrogen Sulphide Gas Passed Aqueous Solution Xso4 Black Precipita Aqueous Solution Compound P Reacts Sodium Bromide Solution Form Yellow Precipitate Compound Q Used P Strip Metal X Dipped Blue Coloured Salt Solution Yz Time Colour Solution Gets Discharged Metal Forme Three Metal Pieces X Z Taken Cleaned Sand Paper Separately Put Test Tubes Ii Iii Respectively Contai List Tabular Three Chemical Properties Basis Differentiate Metal Non Metal B Give Reasons Following Write Chemical Equations Following Reactions Calcium Metal Reacts Water Ii Cinnabar Heated Presence Explain Following Sodium Chloride Ionic Compound Conduct Electricity Solid State However Conduct Ele Q Would Observe Adding Zinc Granules Freshly Prepared Ferrous Sulphate Solution Give Reason Answer Classify Following Reactions Different Types Agno3 Aq Nacl Aq Agcl Nano3 Aq Ii Cao H2o L Ca Oh 2 Aq Following Metals Used Thermometer Metals Produce Ringing Sound Striking Said Metals Show Property Malleability Except Non Metal Could Used Antiseptic Property Match Following Non Metals Uses Non Metal Uses Chlorine Fertilisers Ii Oxygen B Disinfectant Iii Nit Name Metal Widely Used Making Aeroplanes Following Statements Incorrect Match Following Columns Column Column Ii Sulphur Antiseptic B Chlorine Ii Fungicide C Iodine Iii Ins Aqueous Solution Compound Reacts Silver Nitrate Solution Form White Precipitate Compound B Used Anti Name Alloy Contain Aluminium Homogeneous Composition Choose Incorrect Statement Given Reaction Nitric Acid Carbon Carbon Non Metal React Nitric Acid Ii C Piece Metal X Dissolved Colorless Salt Solution Yz Time Color Solution Changes Green Metal Obtained Metal Reacts Nitric Acid Three Different Concentrations X Z Hno3conc X Salt B Gas Ca Hno3conc Salt B Silvery White Metal X Reacts Blue Vitriol Green Vitriol Turns Colorless Metal Oxide Metal X Prevents Use Following Information Answer Next Question Happen Given Granules Test Tube Use Following Information Answer Next Question One Following Required Identify Gas Evolved Reaction Following Chemical Reactions Type Precipitation Reaction Following Reactions Hydrogen Gas Evolved Find Correct Alternative Amongst Following Options Regarding Reaction Metals Water Following Reactions Example Displacement Reaction Omkar Gandhi Resident North India Went Vellore Small Town State Tamil Nadu Southern Part Country Pur Unlike Metal Oxides Metal Oxide Metal X Dissolves Water Form Compound Compound Widely Used Paper Mak Metal X Burns Air Black Coloured Compound Formed Small Amount Compound Taken Beaker Dilute Hydrochlo Assertion Copper Strip Placed Solution Silver Nitrate Colour Solution Changes Blue Colourless Reason Assertion Potato Chips Packaged Nitrogen Gas Reason Nitrogen Gas Present Abundance Nature Compound Obtained Reaction Iron Steam Fe2o3 B Fe3o4 C Feo Fe2o3 Fe3o4 Element X Reacts O2 Give Compound High Melting Point Compound Also Soluble Water Element X Likely Ir Hydrogen Sulphide Gas Passed Blue Solution Copper Sulphate Black Precipitate Copper Sulphide Obtaine Following Question Statement Assertion Followed Statement Reason Choose Correct Answer Following Cho Following Statements True Reaction Sodium Sulphate Solution Barium Chloride Solution Following Lustrous Sulphur Dioxide Reacts Water Form Compound X X Formed Turn Blue Litmus Paper Red X Beaten Thin Sheets Following Use Non Metal Copper Vessel Exposed Moist Air Long Acquires Dull Green Coating Green Material Formed Mixture Following Example Amphoteric Oxide One Following Statements Correct Displacement Reactions Following Materials Beaten Thin Sheets Happens Magnesium Ribbon Burnt Air Happens Iron Nail Dipped Copper Sulphate Solution Following Metals React Cold Water Bronze Alloy