Answer: Defective metal blocks will not allow ultrasound to pass through it and reflect it back. This technique is used in detecting defects in metal blocks. Make a set up as shown in the figure with ultrasound being passed through one end and detectors placed on the other end of a metal block.

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The correct answer is Copper. Key Points Copper Copper was first used by man over 10,000 years ago. Hence, Option 4 is correct. A copper pendant discovered in what is now northern Iraq has been dated about 8700 B.C. For nearly five millennia copper was the only metal known to man, and thus had all the metal applications.

Aranmula metal mirror is a rare piece of craft that had existed even during the Vedic period of Indian history. The myth about the origin and secret of its composition makes it a truly fascinating craft. As traditional as the mirror-making technology is, the artisans’ belief that the composition of the metal mirror is divine and some.

Melting point of metals: Metals often have high melting and boiling points, but there are many exceptions to the melting point, like cesium, gallium, mercury, rubidium and tin which all have fairly low melting points. However, most boiling points are still quite high.

#acidsbasesandsalts #class10science Key Areas Covered in this session: 1. which gas is usually liberated when an acid reacts with a metal. illustrate with an.

Explanation: a) zinc metal is added to copper sulphate solution. When zinc is added to copper sulphate solution due to more reactivity of zinc, copper is replaced by zinc and forms zinc sulphate. During the process, the colour of the solution changes from blue to colourless. → (Zinc) (Copper sulphate) (Zinc sulphate) (Copper)

A substance X which is used as an antacid reacts with dilute hydrochloric acid to produce a gas Y which is used in one type of fire-extinguisher. Name the substance X and gas Y. Write a balanced equation for the chemical reaction which takes place. Medium Solution Verified by Toppr Substance X is Sodium Hydrogen Carbonate and Y is Carbon Dioxide.

Hydrogen gas is usually liberated when an acid reacts with a metal. Take few pieces of zinc granules and add 5 ml of dilute H 2 SO 4 and shake it. The gas produced is passed into a soap solution.

Solution 1 In the electrolytic refining of a metal M: Anode → Impure metal M Cathode → Thin strip of pure metal M Electrolyte → Solution of salt of the metal M Solution 2 In electrolytic refining of a metal, the electrolytic refining tank consists of: Anode: A bulky piece of impure metal (attached to positive terminal)

1Answer 0votes answeredAug 29, 2019by Durgesh01(71.8kpoints) selectedAug 29, 2019by Anirudh01 Best answer A metal can be extracted from its oxide by the process of redution. `2HgO(s)overset("Heat")rarr2Hg(I) +O2(g)` Please log inor registerto add a comment. ← Prev QuestionNext Question →

Q. (a) Explain why metals usually do not liberate hydrogen gas with dilute nitric acid. (b) Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid. Q. Name two metals which will displace hydrogen from dilute acids, and two metals which will not. Q.