Which one of the following processes involve chemical reactions? Mark as favorite Copy Link Keeping petrol in a china dish in the open Heating copper wire in presence of air at high temperature Liquefaction of air Storing of oxygen gas under pressure in a gas cylinder Check Answer
In the reaction Hg2Cl2 + Cl2 -> 2HgCl2 The reducing agent is? Mark as favorite Copy Link HgCl2 Cl2 Both Cl2 and HgCl2 Hg2Cl2 Check Answer
Which one of the following processes involve chemical reactions? Mark as favorite Copy Link Keeping petrol in a china dish in the open Heating copper wire in presence of air at high temperature Liquefaction of air Storing of oxygen gas under pressure in a gas cylinder Check Answer
A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation? Mark as favorite Copy Link KMnO4 is an unstable compound and de-composes in presence of FeSO4. to a colourless compound KMnO4 is an oxidising agent, it oxidises FeSO4 The colour disappears due to dilution; no reaction is involved FeSO4 acts as an oxidising agent and oxidises KMNO4 Check Answer
The brown gas evolved on heating of copper nitrate is? Mark as favorite Copy Link O2 NO2 N2 NO Check Answer
Name the products formed when iron filings are heated with dilute hydrochloric acid? Mark as favorite Copy Link Fe (II) chloride and hydrogen gas Fe (III) chloride and hydrogen gas Fe (II) chloride and water Fe (III) chloride and water Check Answer
MnO2 + 4HCl -> MnCl2 + H2O + Cl2 The oxidising agent is? Mark as favorite Copy Link Ag + Zn(NO3)3 MnCl2 MnO2 HCl Check Answer
A student added dilute HCl to a test tube containing zinc granules and made following observations? Mark as favorite Copy Link a gas evolved which burnt with a pop sound the solution becomes green in colour the zinc surface became dull and black the solution remained colourless Check Answer
A compound used for whitewashing is? Mark as favorite Copy Link Limestone Blue vitriol Slaked Lime Quick lime Check Answer
Lead nitrate Pb(NO3)2 on heating forms Lead oxide (PbO) solid and Nitrogen dioxide gas. What are the color of lead oxide and nitrogen dioxide? Mark as favorite Copy Link Yellow, Brown Yellow, Colourless White, Brown White, Colourless Check Answer