Sadhana Devi Vidyapith, Samastipur ASSIGNMENT -1, (2012-13) Sub. – Chemistry, Class IX Chapter: Matter in our surrounding NOTE : Q 1 to 15 carries 2 marks each & Q 16 to 25 carries 3 marks each Q.1 Some substances cannot exist in the gaseous state, other cannot exist in the liquid state, and some cannot exist either in the gaseous or the liquid state. Giving suitable examples. Justify the above statement? Q.2 A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was filled with pungent irritating smell. The students immediately opened the windows and doors and switched on the exhaust fans. After sometime, student got relief. Explain what did actually happen? Q.3 Carbon dioxide which is a gas under normal conditions of temperature and pressure can be liquefied by compressing it to 70 atm at ordinary temperature. What happens when...
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