Q. The oxidation number of chromium in chromyl chloride is -
1) 0
2) +4
3) +2
4) +6
Q. Which among the following metals oxide provide amphoteric nature ?
1) Sodium
2) Silver
3) Aluminium
4) Calcium
Q. Old paintings can be restored through an oxidizing agent -
1) H2S
2) H2O2
3) H2PO4
4) H3O+
Q. What property stays the same during physical and chemical changes in a closed system ?
1) Density
2) Shape
3) Mass
4) Arrangement of particle
Q. Which radioactive element is used in heart pacemaker ?
1) Uranium
2) Deuterium
3) Plutonium
4) Radium
Q. Bleaching action of moist SO2 is because of its -
1) Reducing power
2) Oxidising power
3) Acidic property
4) Basic property
Q. In acid rain, the water and snow is contaminated by which of the following pollutants ?
i. Sulphur-di-oxide
ii. Nitrogen oxide
iii. Carbon-di-oxide
iv. Methane
1) Only i and ii
2) Only ii and iii
3) i, iii, and iv
4) I, ii, and iv
Q. The pollutant responsible for ozone holes is -
1) CO2
2) SO2
3) CO
4) CFC
Q. Which one of the following is biodegradable?
1) Plastic
2) Polythene
3) Mercury
4) Rubber
Q. The gas used for inflating the tyres of aeroplanes is -
1) hydrogen
2) helium
3) nitrogen
4) neon
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