1). Brass gets discoloured in air because of the presence of which of the following gases in air?
ANS: B - Hydrogen sulphide
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2). Which of the following is a non metal that remains liquid at room temperature?
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3). Chlorophyll is a naturally occurring chelate compound in which central metal is
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4). Which of the following is used in pencils?
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5). Which of the following metals forms an amalgam with other metals?
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6). Chemical formula for water is
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7). The gas usually filled in the electric bulb is
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8). Washing soda is the common name for
ANS: A - Sodium carbonate
What is the scientific name for washing soda?
Scientific name for baking soda?
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9). Quartz crystals normally used in quartz clocks etc. is chemically
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10). Which of the gas is not known as green house gas?
In order, the most abundant greenhouse gases in Earth's atmosphere are:
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11). Bromine is a
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12). The hardest substance available on earth is
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13). The variety of coal in which the deposit contains recognisable traces of the original plant material is
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14). Tetraethyl lead is used as
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15). Which of the following is used as a lubricant?
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16). The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
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17). The gases used in different types of welding would include ANS: D - oxygen and acetylene
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18). The property of a substance to absorb moisture from the air on exposure is called
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19). In which of the following activities silicon carbide is used?
ANS: C - cutting very hard substances
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20). The average salinity of sea water is
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21). When an iron nail gets rusted, iron oxide is formed
ANS: C - with increase in the weight of the nail
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22). Galvanised iron sheets have a coating of
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23). Among the various allotropes of carbon,
ANS: C - diamond is the hardest, graphite is the softest
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24). The group of metals Fe, Co, Ni may best called as
ANS: A - transition metals
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25). Heavy water is
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26). The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
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27). The element common to all acids is
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28). Non stick cooking utensils are coated with
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29). Monazite is an ore of
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30). Carbon, diamond and graphite are together called
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31). Potassium nitrate is used in
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32). Permanent hardness of water may be removed by the addition of
ANS: A - sodium carbonate
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33). Soda water contains
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34). The most important ore of aluminium is
Bauxite is an aluminium ore and is the main source of aluminium.
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35). Most soluble in water is
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36). Which of the following was to be discovered first in the chromospheres of the sun?
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37). Which of the following is in liquid form at room temperature?
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38). Sodium metal is kept under
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39). Which of the following are the ingredients of gun metal?
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40). From which mineral is radium obtained?
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41). What is laughing gas?
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42). Actinides are the elements with atomic numbers from
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43). The two elements that are frequently used for making transistors are
ANS: B - silicon and germanium
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44). The filament of an electric bulb is made of
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45). Diamond is an allotropic form of No answer description available for this question.
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46). In fireworks, the green flame is produced because of
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47). Permanent hardness of water can be removed by adding
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48). Marsh gas is No answer description available for this question.
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49). LPG consists of mainly ANS: D - methane, butane and propane
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50). Air is a/an
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51). Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
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52). Balloons are filled with
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53). Which of the following does not contain a coinage metal?
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54). Which metal pollute the air of a big city?
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55). Bell metal is an alloy of
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56). Water is a good solvent of ionic salts because
ANS: C - it has a high dipole moment
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57). Which of the following is not an isotope of hydrogen?
http://en.wikipedia.org/wiki/Isotopes_of_hydrogen
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58). The main constituents of pearls are
ANS: B - calcium carbonate and magnesium carbonate
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59). Amalgams are
ANS: B - alloys which contain mercury as one of the contents
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60). Which of the following is the lightest metal?
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61). Which of the following metals remain in liquid for under normal conditions?
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62). Potassium Permanganate is used for purifying drinking water, because ANS: D - it is an oxidising agent
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63). Which of the following is an element?
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