Q. Match List I with List II and select the correct answer using the codes given below the Lists :
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List I
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List II
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I. German Silver
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(A) Tin
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II. Solder
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(B) Nickel
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III. Bleaching Powder
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(C) Sodium
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IV. Hypo
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(D) Chlorine
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Codes:
Answer:
I-B, II-A, III-D, IV-C
Notes: German silver varies in composition, the percentage of the three elements ranging approximately as follows: copper, from 50% to 61.6%; zinc, from 19% to 17.2%; nickel, from 30% to 21.1%. The proportions are always specified in commercial alloys.
A type of lead-free solder made from tin and copper. SnCu is a commonly used type of lead-free solder. A metal alloy, with a melting point or melting range below 840°F (450°C), which is melted to join metallic surfaces. Powdered solder alloy formed into small spheres and coated with a layer of flux.
Calcium hypochlorite is an inorganic compound with formula Ca(ClO)₂. It is the main active ingredient of commercial products called bleaching powder, chlorine powder, or chlorinated lime, used for water treatment and as a bleaching agent.
Hyponatremia is the term used to describe low sodium levels in the bloodstream (hypo=low + natr=sodium + emia=blood). Acute hyponatremia describes the situation in which sodium levels drop quickly, while chronic hyponatremia describes situations with a gradual fall in the sodium concentrations over days or weeks.