It is health which is real wealth, and not pieces of gold and silver comment.
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In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal.
Answer 2AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2Ag (s) Silver Nitrate + Copper → Copper Nitrate + Silver
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Give reasons (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil.
(a) Platinum, gold, and silver are used to make jewellery because they are very lustrous. Also, they are very less reactive and do not corrode easily. (b) Sodium, potassium, and lithium...
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A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?
One gram of gold sample will contain 90/100 =0.9g of gold Number of moles of gold = Mass of gold/ Atomicmass of gold ...
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A silver ornament of mass ‘m’ gram is polished with gold equivalent to 1% of the mass of silver.
Mass of silver = m g Mass of gold = m /100g Number of atoms of silver = Mass/ Atomic mass X NA ...
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Which zone of a flame does a goldsmith use for melting gold and silver and
A goldsmith uses the outer part of the candle flame for melting gold and silver because in this zone the temperature is the highest which helps to melt these metals...
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Mrs. Sharma has gone to the jewellers shop to buy gold jewellery. She asks the jeweller, if the jewellery is made of pure gold.
(i) No, he was wrong. Pure gold is very soft and is, therefore, not suitable for making jewelry. It is alloyed with either silver or copper to make it hard....
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What is 24-carat gold? How will you convert it into 18-carat gold?
24-carat gold is pure gold. Pure gold is very soft and not suitable for making jewellery. Therefore, to increase its hardness, it is allowed either with copper or silver. 18-carat gold is...
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Which of the following is an exothermic reaction? (A) Conversion of limestone to quick lime. (B) Conversion of silver bromide to silver
(C) Formation of compost from vegetable matter. Reactions given in option (A), (B) and (D) are examples of endothermic reactions and require energy in form of heat, light and electricity respectively....
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The mass of a box measured by a grocer’s balance is 2.300 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box.
Mass of grocer’s box = 2.300 kg Mass of gold piece I = 20.15g = 0.02015 kg Mass of gold piece II = 20.17 g = 0.02017 kg Total mass of the box...
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List two properties of gold and silver which make them most suitable for making ornaments according to our need.
Malleability and ductility are two properties. Malleability is the property of the metals to be hammered into thin sheets. Ductility is the ability of the metals to be drawn into...
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