Q. 575.0( 1 Vote )
Element X reacts with element Y to form a compound Z. During the formation of compound Z, atoms of X lose one electron each whereas atoms of Y gain one electron each. Which of the following property is not shown by compound Z? A. high melting point
B. low melting point
C. occurrence as solid
D. conduction of electricity in molten state
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Explain the following statements:
i. Most metal oxides are insoluble in water but some of these dissolve in water. What are these oxides and their solutions in water called?
ii. At ordinary temperature, the surface of metals such as magnesium, aluminium and zinc, etc. is covered with a then layer. What is the composition of this layer? State its importance.
iii. Some alkali metals can be cut with a knife.Xam idea - Science
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Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
(iv) KNCERT - Science Exemplar
Silver articles become black on prolonged exposure to air. This is due to the formation ofNCERT - Science Exemplar
State reasons for the following observations:
(a) The shining surface of some metals becomes dull when exposed to air for a long time.
(b) Zinc fails to evolve hydrogen gas on reacting with dilute nitric acid.
(c) metal sulphides occur mainly in rocks but metal halides occur mostly in sea and lake waters.Together With Science