Brass an alloy and Brass gets discoloured in air because of the presence of which of the following gases in air?
Liquid state is one of the physical state of matter in which the matter is less compactly packed in comparision to solid and more than gas. A liquid metal at room temperature with silvery lusture is Mercur,y. Name the only non metal which is liquid at room temperature:
A well known green pigment called Chlorophyll is a coordination chelate compound. The compound helps plants to prepare there reserve food. In chlorophyll the chelation of organic part is with a well known metal ________________.
A lead pencil is used to make the marks and writings on the paper. The pencil is embeded with a black thin cylindrical rod in a wooden cylinder. Name the black substance
Amalgamation leads a history for creating a series of alloy with wide range of application. The process of amalgamation founds its application in dentestry. The silver amalgam is used for filling of carries. Name the essential metal which is used for amalgamation:
Electric Bulb created the history in the work field of Science and its Blessings. The electric bulb have filament of tungsten due to its high melting point etc. with a gas to provide the inert atmosphere:
Quartz crystals normally used in quartz clocks etc. is chemically
The variety of coal in which the deposit contains recognisable traces of the original plant material is
Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
C. Tube light
D. Cooking gas
Coinage metal find its application and is mentioned in the pages of history. The process called parting is used for the separation of coinage metal from coins:
Which of the following does not contain a coinage metal?
A. Silver and Gold
B. Zinc and Gold
C. Copper and Silver
D. Copper and Gold