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Amalgam : • Alloy obtained after mixing mercury with another metal is called Amalgam. • All metals but Iron, Platinum, Tungsten and Tantalum form Amalgam with mercury. • Siver and gold amalgams are used to fill tooth cavities in dentistry. • Metallic bonds (arising out of electrostatic forces) hold the metals together in amalgam. Mercury : Mercury is a transition metal present in period 6 and group 12 of the periodic table with 80 as the atomic number. • Mercury is the only metal, which is liquid at room temperature. • When placed in a tube meniscus of mercury is convex, opposite to concave meniscus of water. • It is used in clinical thermometers because of the property of its proportional expansion with increasing temperature. • Elemental mercury is toxic to living beings and Minamata disease is associated with its consumption.
115% of 40 + 3 × 4 = ? × 11 – 8
(5.6 + 2.4 + 13.8 – 2.8) × 5 = ? × (12.5 – 7.5)
Find the value of 5342.5 +543.45+54.345 +5.4345+0.54345.
182 + 10 × 12 - ? = 312
180 % of 45 + √144 × 8 = ?2 + 80 % of 70
√1764 + 35 × 8 + 39 = ?2
690 ÷ (75% of 460) = ? ÷ (50% of 160)
√ [? x 11 + (√ 1296)] = 16
63- [22-{24 ÷ 3-(9-15 ÷ 5) ÷ 6}]=?
1231 + 1312 + 2113 – 3211 = ?
