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Which of the following statement about butane is correct? The IUPAC name of butane is also butane. But its common name is n-butane. 
In a village 50% of the villagers produce rice, 40% of the villagers produce apples and 50% of the villagers produce vegetables, 20% of the villagers produce rice and apples both, 25% of the villagers produce apples and vegetables both, 20% of the villagers produce rice and vegetables both and 10% of the villagers produce all three. Find the percentage of villagers who do not produce anything.
When pure carbon is burned in air, some of it oxidizes into CO2 and some to CO. The molar ratio of N2 to O2 is 7.18 and the ratio of CO to CO2 is 2.0 in the product gas. What is the percent excess air used? The exit gases contain only N2, O2, CO and CO2.
For the given chemical reaction C6H14 + 19/2 O2 → 6 CO2+ 7 H2O 7. If the required amount of CO2 is 440 kg/hour then how much kg of C6H14 should be burned per hour?
In a village there are 300 people. They produce different crops, out of all people 190 people produce paddy, 160 people produce wheat and 100 people produce both paddy and wheat. Find the number of people who neither produce paddy nor wheat. 
Pentane is burnt to produce carbon dioxide 40% of which can be converted into carbon monoxide, how much Butane must be burnt to produce 176 grams of carbon monoxide?
How many grams of C2H6 are required to produce 88 grams of CO2 when it is burned in the excess of oxygen?
If the average number of calories burned by B on Thursday, Friday and Saturday together is 125, what was the number of calories burned by B on Saturday?
If the number of calories burned by A and B increased by 10% and 20% respectively from Friday to Saturday, what was the total number of calories burned by them together on Saturday?
জলজ উদ্ভিদে সালোকসংশ্লেষণের হার বেশি কারণ-i. পানিতে CO2 এর পরিমাণ 0.3%ii. সকল অঙ্গ CO2, শোষণ করতে পারেiii. CO2, ও O2, এর পরিমাণ সমাননিচের কোনটি সঠিক?