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Q25) Formula for tear gas is : [2005]



SOLUTION

Answer: (b)


Q26) A gas mixture contains O2 and N2 in the ratio of 1: 4 by weight. The ratio of their number of molecules is: [2006]



SOLUTION

Weight Ratio 1:4 thus
mole ratio 1/32 : 4/28
1/32: 1/7 or 7:32
Answer: (d)


Q27) Pure silicon doped with phosphorus is a: [2006]



SOLUTION

Silicon is semi-metal and phosphorus is penta-valent. Phosphorus will donate electrons. Thus it will be n-type semiconductor
Answer: (c)



Q28) A brown ring appears in the test for [2007]



SOLUTION

Brown ring is formed during the test is due to formation of [Fe(NO)]SO4 It detect the presence of Nitrate.
Answer: (a)


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