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Dec 31, 2014



Alumin...

Jul 18, 2014

####  Show the formation of Na2O and MgO by the transfer of electrons



Ans: Atomic number of Sodium (Na) – 11
Electronic configuration of Sodium – 1s2 2s2 2p6 3s1
It has one valence electron, it will lose one el...

Sep 24, 2014



THERMITE?????

Jan 19, 2015



Apr 25, 2015

#### When you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberates immediately with brisk effervescence. Name this gas. Describe the method of testing this gas



Sodium hydrogencarbonate on reaction with acetic acid releases c...

Jul 18, 2014

####  An element reacts with oxygen to give a compound with high melting point. This compound is also soluble in water. The element is likely to  be                                                          (a) Ca (b)C  (c)Si  (d) Fe



When carbon reacts with oxygen it forms carbon dioxide. this carbon dioxide is a gas. gases do not possess melting point. so option B is not correct
Silicon reacts with oxygen and forms silicon dioxide. ...

Jul 18, 2014

####  Why is sodium chloride soluble in water but not in kerosene or petrol?



Asked by Mr s n tiwari

Sep 11, 2014

#### A few drops of sulphuric acid are added into water before electrolysis. why?



Ans :Electrolysis of pure water is very low because water is an covalent compound so it can't ionize to release ions. To increase the conductivity of water a few drops of sulphuric acid is added .Being a st...

Jan 2, 2015

#### Why copper is added to pure gold for making ornaments?



Pure gold is very soft and it is not used for making jewellery. Copper or silver is added to pure gold to make it hard. Pure gold is called 24 carat go...