Related InterviewSolutions

• `2HOCl to2HCl+O_(2)` is a ____________ decomposition reaction.
• Formation of clouds , mist and fog are the examples of ____________.A. chemical combination of `O_(2)and H_(2)O`.B. physical change which involves condensation of water vapourC. physical change which involves sublimation.D. chemical change which involves absorption of huge amounts of energy.
• Magnesium attains octet configuration by ____________ electrons.
• Which among the following reactions is not balanced ?A. `2KClO_(3) to2KCl+3O_(2)`B. `2Fe(OH)_(3)+4H_(2)SO_(4)toFe_(2)(SO_(4))_(3)+6H_(2)O`C. `2Pb(NO_(3))_(2)to2PbO+4NO_(2)+O_(2)`D. `2KNO_(3)+FeSO_(4)toFeSO_(4)toK_(2)SO_(4)+Fe(NO_(3))_(2)`
• Which of the following is a physical change ?A. Dissolution of lime in water.B. Dissolution of `CO_(2)` in water at high pressure.C. Dissolution of concentrated acid in water.D. Electrolysis of water.
• Which among the following is not a characteristic of a physical change?A. The change is temporary.B. No new substance is formed.C. Molecular formula of a compound changes.D. Change of state of matter takes place without any change in molecular composition.
• Which of the following involves only physical change ?A. Dissolution of lime in water.B. Dissolution of carbon dioxide in water at high pressure.C. Dissolution of concentrated acid in water.D. Electrolysis of water.
• If the formula of respective chlorides of X and Y are `XCl_(3) and Ycl_(4)` respectively , then the valencies of X and Y areA. 3 and 2B. 3 and 4C. 1 and 1D. 1 and 4
• `CuSO_(4)+XtoXSO_(4)+Cu,CuSO_(4)+YtoYSO_(4)+Cu,` `XSO_(4)+YtoNo` reaction , `CuSO_(4)+ZtoNo` reaction, Arrange Cu , X, Y and Z in the ascending order of reactivity.A. X, Y, Z, CuB. Cu , Y , X , ZC. Cu , X, Z, YD. Z , Cu , Y , X
• Arrange the following sequence in order to derive the formula of zine oxide. (a) The valencies of ions formed by zine and oxygen are written below without positive and negative sign. (b) The positive ion that is `Zn^(+2)` followed by the negative ion , that is oxide `(O^(-2)` ion are written with ther charges. (c ) The valencies of zinc and oxide ion have common factors and hence they are divided by their highest common factor. (d) The magnitude of valencies of the ions should be interchanged and written as subscripts on right side of the respective ions.A. badcB. abcdC. bacdD. cabd