1.Which gas is Used for Welding:
Answer:Acetylene
2.Which of the metal is found in free form in nature:
Answer:Gold
3.The pH Value of blood :
Answer:7.4
4.Metal is extracted from Sulphide ores by:
Answer:Froth floatation
5.Scheelite is the ore of:
Answer:Tungsten
6.Nitrating mixture contains Sulphuric acid and__________:
Answer:Niticacid
7.The impurities contained in ore is known as:
Answer:Gangue
8.The most abundant gas in the atmosphere of Mars:
Answer:CO2
9.Chalcopyrite is the most important _______________ore:
Answer:Copper
10.Which metal has the least resistance:
Answer:Silver
11.Pitchblende is the ore of:
Answer:Uranium
12.The gas Used in Cigarette Lighters:
Answer:Butane
13.When iron rusts its weight___________:
Answer:increases
14.the acid that cannot be kept in glass bottles:
Answer:hydrochloric acid
15.the year of Chemobyi disaster:
Answer:1986
