SUBJECT:CHEMISTRY MARKS: 25
CLASS:10-O Level TIME: 35 min.
Solve all three questions on answer sheet . Neat presentation would be appreciated. Q.No.1:
The figure below represents a section of catalytic converter. Catalytic converters are used in car exhaust to reduce air pollution.
(a) (i)name substance X.
(ii) What is the purpose of putting X in the catalytic converter? (b)Y contains a mixture of gases. Name three gases present in Y which are (i)affected by X.
(ii)not affected by X.
(c)Z contains another mixture of gases. Name two gases in Z which are produced by chemical reaction as Y passes through the catalytic converter. (d)Write word equations for the two reactions that take place in catalytic converter.
Carbon dioxide is a greenhouse gas. Carbon dioxide is given a greenhouse factor of 1. Other gases are given a greenhouse factor that compares their effect with carbon dioxide. The greenhouse effect increases as the factor value increases. The table gives the information about four different gases.
|gas |Greenhouse |Percentage of gas in atmosphere | | |factor | | |CO2 |1 |0.036 | |CH4 |30 |0.0017 | |N2O |160 |0.00030 | |CCl3F |21000 |0.000000028 |
a) State one possible consequence of greenhouse effect.
b) Why is an increase in the percentage of methane more worrying than the same percentage...