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1.	Which of the following are ores of zinc?(a) Cobaltite(b) Erythrite(c) Marmatite(d) LithargeThis question was posed to me in exam.The origin of the question is Aircraft Steels topic in portion Aircraft Steels of Aerospace Materials & Processes
Answer» The correct choice is (c) Marmatite To elaborate: Zinc and most ELEMENTS are rarely found in their pure state, they are found in the form of ores. Zinc is ALSO found in the form of LIKE in like Marmatite, zinc sulphide (ZnS), Calamine, ETC. in different places.

2.	Zinc is an element that is being used fairly recently.(a) True(b) FalseI got this question during an interview.My doubt stems from Aircraft Steels topic in section Aircraft Steels of Aerospace Materials & Processes
Answer» Right OPTION is (B) False The BEST explanation: Zinc has been used extensively in the past and is being used in the present as well. Zinc was not produced on a BIGGER scale until the twelfth century but was used before that as well.

3.	Pure zinc in metallic form was discovered by a __________ chemist.(a) Persian(b) Indian(c) American(d) GermanI got this question during an interview.Origin of the question is Aircraft Steels topic in portion Aircraft Steels of Aerospace Materials & Processes
Answer» Correct choice is (d) German Explanation: Pure zinc in METALLIC form was discovered by a German-based CHEMIST. ANDREAS Sigismund Marggraf is the chemist that discovered zinc in a pure metallic state. The WORD ‘zinc’ is also DERIVED from the German word “Zinke”.

4.	The atomic number of zinc is ___________(a) 25(b) 13(c) 104(d) 30The question was posed to me during a job interview.This key question is from Aircraft Steels in section Aircraft Steels of Aerospace Materials & Processes
Answer» CORRECT ANSWER is (d) 30 Explanation: The atomic NUMBER of ZINC is 30. 25 is the atomic number of the element manganese. 13 is the atomic number of aluminium. RUTHERFORDIUM is the synthetic chemical element with an atomic number of 104.

5.	Zinc is alloyed with which of the following elements frequently?(a) Vanadium(b) Copper(c) Helium(d) RutherfordiumI had been asked this question by my college professor while I was bunking the class.My question is based upon Aircraft Steels in chapter Aircraft Steels of Aerospace Materials & Processes
Answer» The correct OPTION is (b) Copper To explain I would say: ZINC is often ALLOYED with the ELEMENT copper to obtain the metal alloy brass. It is used extensively for several purposes like decorative items. Zinc is ALSO alloyed with several elements like tin, aluminium etc.

6.	Zinc is a non-lustrous element.(a) True(b) FalseI got this question during an internship interview.My doubt is from Aircraft Steels in section Aircraft Steels of Aerospace Materials & Processes
Answer» CORRECT choice is (b) False The best I can explain: The above STATEMENT is incorrect. Zinc is an element that is LUSTROUS. It is solid at room temperature and is also slightly brittle in nature. Zinc is a post-transition element in the PERIODIC table.

7.	The melting point of zinc is __________(a) 1495°C(b) 1445°C(c) 787.1°C(d) 787.1°FThe question was posed to me in a job interview.I need to ask this question from Aircraft Steels topic in division Aircraft Steels of Aerospace Materials & Processes
Answer» Correct OPTION is (d) 787.1°F Explanation: The melting point of an ELEMENT is the point of TEMPERATURE at which the PHASE of the element changes. The melting point of zinc is 787.1°F. 1495°C is the melting point of the element cobalt.

8.	Zinc in the form of ores can be found in which of the following places?(a) Antarctica(b) Canada(c) Canada and Russia(d) Russia and AntarcticaI got this question in a national level competition.Enquiry is from Aircraft Steels topic in chapter Aircraft Steels of Aerospace Materials & Processes
Answer» Correct option is (c) Canada and Russia To EXPLAIN I would SAY: ZINC is found in the form of ores in various places across the world. It is FREQUENTLY found in countries like Canada, Russia, the United States of America, etc. The ore has to undergo several processes to OBTAIN pure zinc.

9.	Zinc is ___________ in colour.(a) black(b) yellow(c) bluish-silver(d) redThis question was posed to me in examination.The question is from Aircraft Steels in division Aircraft Steels of Aerospace Materials & Processes
Answer» CORRECT choice is (c) bluish-silver The BEST I can EXPLAIN: Zinc is an element that is typically bluish-silver in colour. Some elements that are black in colour are boron and carbon. The element bromine is RED in colour. Sulfur, CHLORINE, etc. are yellow in color.

10.	The density of Zinc is ____________ at room temperature.(a) 2.7 gram per cubic centimetre(b) 6.52 gram per cubic centimetre(c) 7.14 gram per cubic centimetre(d) 0.44 gram per cubic centimetreThis question was addressed to me in unit test.My question comes from Aircraft Steels in portion Aircraft Steels of Aerospace Materials & Processes
Answer» Correct OPTION is (c) 7.14 gram PER cubic CENTIMETRE To elaborate: The DENSITY of the element zinc is 7.14 gram per cubic centimetre. 2.7 gram per cubic centimetre is the density of aluminium. 6.52 gram per cubic centimetre is the density of the element ZIRCONIUM.