Chapter 16

If \(\mathrm{BOD}\) of a river is high, it means that the river is (a) not polluted (b) very much polluted with inorganic chemicals (c) Very much polluted with organic chemicals, which are decomposed by micro- organisms (d) polluted with pesticides

Photochemical oxidant PAN is formed (a) by action of oxides of nitrogen on hydrocarbons in the presence of sunlight (b) by action of carbon dioxides on the hydrocarbons in the presence of sunlight (c) by action of hydrogen sulphide on hydrocarbons in the presence of sunlight (d) by the action of \(\mathrm{SO}_{2}\) and hydrocarbons

Gas released during Bhopal tragedy was (a) sodium isothiocyanate (b) ethyl isothiocyanate (c) sotassium isothiocyanate (d) methyl isothiocyanate

Which one is the bio-degradable pollutant? (a) Lead compounds (b) Mercuric salts (c) Pesticides (d) Domestic wastes

One of the metals used as a catalyst in automobiles catalytic converter is (a) palladium (b) copper (c) radium (d) iron

The co-ordination number of Fe in \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6} \mathrm{l}\right.\) is (a) four (b) three (c) six (d) ten

\(\mathrm{SO}_{2}\) and \(\mathrm{NO}_{2}\) produce pollution by increasing (a) alkalinity (b) acidity (c) neutrality (d) buffer action

In the complex ion \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{9} \mathrm{NO}\right]^{2+}\) (a) Fe is in the +l oxidation state, and NO coordinates as NO' (nitrosonium ion) (b) Fe is in the \(+1\) oxidation state, and NO coordinates as neutral NO (nitrosyl) radical (c) Fe is in the \(+3\) oxidation state and NO coordinates as NO (d) Fe is in the \(+2\) oxidation state and NO coordinates as NO'

COD refers to (a) chemical oxygen demand (b) chemistry of diamonds (c) catalyzed oxidation of dissolved salts

Co-ordination number and oxidation number of \(\mathrm{Cr}\) in \(\mathrm{K}_{3}\left[\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]\) are respectively (a) 4 and \(+2\) (b) 6 and \(+3\) (c) 3 and \(+3\) (d) 3 and 0

Minamata disease is due to pollution of (a) organie waste into drinking water (b) oil spill in water (c) industrial waste mercury into Fishing water (d) arsenic into the atmosphere

Which of the following is used in cancer-chemotherapy? (a) Cisplatin (b) Zeisse's salt (c) Both (a) and (b) (d) None of these Whic

Spraying of DDT produces pollution of the type (a) air and water (b) air (c) air, water and sail (d) air and soil

Which of the following is used in cancer-chemotherapy? (a) Cisplatin (b) Zeisse's salt (c) Both (a) and (b) (d) None of these Whic

Increasing skin cancer and high mutation rate are due to (a) acid rain (b) ouone depletion (c) CO pollution (d) \(\mathrm{CO}_{2}\) pollution

Stability constants for some copper complexes are given below \(\mathrm{Cu}^{+2}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{+2} \quad \mathrm{~K}=4.5 \times 10^{11}\) \(\mathrm{Cu}^{+2}+4 \mathrm{CN}^{-} \rightleftharpoons\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{-2} \quad \mathrm{~K}=2.0 \times 10^{2}\) \(\mathrm{Cu}^{+2}+2 \mathrm{sen} \rightleftharpoons\left[\mathrm{Cu}(\mathrm{en})_{2}\right]^{+2} \quad \mathrm{~K}=3.0 \times 10^{15}\) \(\mathrm{Cu}^{+2}+4 \mathrm{H}_{2} \mathrm{O} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{l}^{+2} \quad \mathrm{~K}=9.5 \times 10^{8}\right.\) Which is the strongest ligand? (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{CN}^{-}\) (c) en (d) \(\mathrm{H}_{2} \mathrm{O}\)

Drained sewage has \(\mathrm{BOD}\) (a) more than that of water (b) eess than that of water (c) equal to that of water (d) none of these

Which of the following complex ions violates the EAN rule ? (a) \(\left[\mathrm{Pu}\left(\mathrm{NH}_{3}\right)_{6} l^{4+}\right.\) (b) \(\left[\mathrm{Fe}(\mathrm{CO})_{5} \mid\right.\) (c) \(\left.\left[\mathrm{Fc}(\mathrm{CN})_{6}\right)\right]^{4}\) (d) \(\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\)

Which ameng the following is biodegradable pollutant? (a) Polythene (b) Asbestos (c) Sewage waste (d) Mercury

The pair \(\mid \mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{NO}_{3} \mathrm{SO}_{4}\) and \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{NO}_{3}\) will exhibit (a) hydrate isomerism (b) linkage isomerism (c) ionization isomerism (d) coordinate isomerism

Disease cauved by eatiag fish found in water contaminated with industrial waste having mercury is (a) Minamata discase (b) Bright's disease (c) Hashimoto's discase (d) osteosclerosis

Which of the following is not a soil pollutant? (a) Polythene bags (b) Pesticides (c) Derergents (d) Nitrate and phoxphate fertilisers

Eutrophication is process which irvolves (a) depletion of opone layer (b) increase in the concentration of owone in water (c) decrease in the conc. of dissolved oxygen in water by algae (d) decrease in the level of \(\mathrm{SO}_{2}\) in air

Most hayardous metal pollutant of automobile exhaust is (a) mercury (b) tin (c) cadmiam (d) lead

Depletion of ozone layer causes (a) blood cancer (b) lung cancer (c) skin cancer (d) breast cancer

When a solution of potassium ferricyanide is added to an aqueous solution of ferrous lulphate, a deep blue colour, known as Turnbull's blue, is produced. The formula of the compound responsible for this deep blue colour is (a) \(\mathrm{KFe}^{\mathrm{mI}}\left[\mathrm{Fe}^{\mathrm{Il}}(\mathrm{CN})_{6}\right]\) (b) \(\mathrm{Fe}_{4}^{\mathrm{m}}\left[\mathrm{Fe}^{\mathrm{II}}(\mathrm{CN})_{6} \mathrm{l}_{3}\right.\) (c) \(\mathrm{KFe}^{\mathrm{II}}\left[\mathrm{Fe}^{\mathrm{IH}}(\mathrm{CN})_{6}\right]\) (d) \(\mathrm{Fe}_{3}{\underline{\phantom{xx}}}^{\mathrm{II}}\left(\mathrm{Fe}^{\mathrm{II}}(\mathrm{CN})_{1} \mathrm{l}_{3}\right.\)

Minamata disease is because of pollution of (d) organic waste going into drinking water (b) oil spill in water (c) industrial waste containing mercury into fishing water (d) arsenic going into the atmasphere

Which of the following reacts with haemoglobin of blood and produce toxic effect? (a) Carbon dioxide (b) Carbon monoxide (c) Osygen (d) Carbon suboxide

When huge amount of sewage is dumped in a river, the BOD will (a) increase (b) remain unchanged (c) decrease (d) increase or decreases

Which of the following is not an air pollutant? (a) \(\mathrm{CO}\) (b) \(\mathrm{SO}_{2}\) (c) NO (d) \(\mathrm{N}_{2}\)

Which is not a \(\pi\)-bonded complex (a) Zeise's salt (b) Ferrocene (c) Dibenzene chromium (d) Tetraethyl lead

Ozone is formed in the upper atmosphere from oxygen by the action of (a) ultraviolet (b) cosmic rays (c) free radicals (d) aitrogen oxides

Which of the following statements is correct ? (a) The \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) ion has a tetrahedral geometry and is diamagnetic (b) The \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) ion has a square planar geometry and is paramagnetic (c) The \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right\\}^{2-}\) ion has a square planar geometry and is diamagnetic (d) The \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2-}\) ion has a tetrahedral geometry and is diamagnetic

The oxidation state of Fe in \(\left[\mathrm{Fc}\left(\mathrm{H}_{2} \mathrm{O}\right){ }_{5} \mathrm{NO}\right] \mathrm{SO}_{4}\) is (a) \(+1\) (b) \(+2\) (c) \(+3\) (d) \(+4\)

The greenhouse effect is cauied by (a) \(\mathrm{NO}_{2}\) (b) NO (c) \(\mathrm{CO}\) (d) \(\mathrm{CO}_{2}\)

When rain is accompanied by a thunderstorm, the collected rainwater will have a pH value (a) slightly higher than that when the thunderstorm is not there (b) uninfluenced by the occurrence of thunderstorm (c) which depends upon the amount of dust in air (d) slightly lower than that of rainwater without thunderstorm

\(\mathrm{CuSO}_{4}\) reacts with KCN solution and forms (a) \(\mathrm{Cu}(\mathrm{CN})\) (b) \(\mathrm{Cu}(\mathrm{CN})_{2}\) (c) \(\mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{CN})_{4} \mid\right.\) (d) \(\mathrm{K}_{4}\left[\mathrm{Cu}(\mathrm{CN})_{6}\right]\)

About \(20 \mathrm{~km}\) above the earth there is an ozone layer, which one of the following statements about ozone and ozone layer is true? (a) Ozone layer is beneficial to us because ozone cuts out the ultraviolet radiation of the sun (b) The conversion of ozone to oxygen is an endothermic reaction (c) Ozone has a triatomic linear molecule (d) Ozone layers is harmful to us because it cuts out a radiation useful for photosynthesis

Which one of the following shows maximum paramagnetic character? (a) \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6} \mathrm{l}^{3+}\right.\) (b) \(\left[\mathrm{Fe}(\mathrm{CN})_{6} \mathrm{l}^{4+}\right.\) (c) \(\mid \mathrm{Fe}(\mathrm{CN})_{6} l^{3+}\) (d) \(\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\)

Which of the following is a secondary pollutant? (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{CO}_{2}\) (c) \(\mathrm{SO}_{3}\) (d) \(\mathrm{NH}_{3}\)

Which kind of isomerism is exhibited by octahedral \(\left[\mathrm{Co}\left(\mathrm{NH}_{2}\right)_{4} \mathrm{Br}_{2}\right] \mathrm{Cl} ?\) (a) Geometrical and ionization (b) Geometrical and optical (c) Optical and ionization (d) Cicometrical only

The secondary pollutants which is formed by dissolution is (a) \(\mathrm{SO}_{3}\) (b) NO (c) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (d) none of these

Which of the following pollutants can cause blue baby syndrome? (a) sulphate (b) fluoride (c) nitrate (d) lead

Co-ordination compounds have great importance in biological systems, in this conick which of the following statements is incorrect? (a) Chlorophyll is a green pigment in plants and contains calcium (b) Haemoglobin is the red pigment of blood and contains iron (c) Cyanocobalamin is \(\mathrm{B}_{12}\) and contains cobalt (d) Carboxypeptidase \(\mathrm{A}\) is an enzyme and contains zinc

Freons are harmful for ozone layer because on absorbing photons of wavelengths between \(175 \mathrm{~nm}\) and \(220 \mathrm{~nm}\), they release atoms which destroy ozone molecules (a) hydrogen (b) fluorine (c) chlorine (d) carbon