Time left 1 Which of the following is used in pencils? Graphite Silicon Charcoal Phosphorous 2 Which of the following is a non metal that remains liquid at room temperature? Phosphorous Bromine Chlorine Helium 3 Chlorophyll is a naturally occurring chelate compound in which central metal is copper magnesium iron copper 4 Brass gets discoloured in air because of the presence of which of the following gases in air? Oxygen Hydrogen sulphide Carbon dioxide Nitrogen 5 Inhibitors are used along with sanitizer to improve their action to prevent corrosion both (a) and (b) none of these 6 Sanitizers used for rubber made equipments are strong acids strong alkalis combination of both none of these 7 The common methods used for disinfection in waste water treatment plants are chlorination UV light both (a) and (b) Phenolic solvent 8 Sanitizer used specifically for vitreous enamel are strong alkalis strong acids weak alkali with sodium silicate none of these
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