Related InterviewSolutions

• Analyse the above diagrams and answer the following questions. (a) Identify the test tube (s) in which new substance (s) is`//`are formed. (b) Does the composition change in all the test tubes ? Give reasons . (C ) Identify the colour changes associated with the relevant physical change given.
• Match the following
• Match the following
• Give two example for the followingA. fast changesB. Desirable changesC. non- periodic changesD. Physical changes
• Which among the following molecules possesses the maximum number of oxygen atoms?A. Carbon dioxideB. Nitric acidC. Sulphuric acidD. Calcium oxide
• What type of change is formation of coal ? A. `A-e,B-d,C-a,D-c,E-b`B. `A-c,B-d,C-e,D-b,E-a`C. `A-b,B-e,C-a,D-c,E-d`D. `A-c,B-d,C-b,D-e,E-a`
• Identify the incorrect formulae among the following : (A) `CaO_(2)` (B) `Na_(2)O` (C ) `Mg_(3)S_(2)` (D) `Mg_(2)O`A. A,B,DB. A,C,DC. C,D,ED. B,C,D
• A desirable change is always associated with an undesirable change. Give as example.
• The formula of a compound of a metal with oxygen is written as MO and that of another metal is written as `M_(2)O` .Give reason. What are the formulae of the compounds of the above metals with chlorine ?
• Burining of cracker is a `"______"` and `"______"` changeA. physical ,fastB. chemical , fastC. chemical ,slowD. physical, slow