What is mortar /
how to do heavy metal test for colour sample?
Why does a match-stick burn, when struck against the match-box surface
Why does a freely supended magnetic needle always point North and South ?
Why does a rose appear black when the light of any other colour except red is made to fall on it ?
Why is ammonia-ammonium chloride buffer added?
What is the composition of ferroin?
Why is the total eclipse of the earth a rare phenomenon ?
Why ph scale range is 14?
How can the iron sheets be prevented from rusting ?
What is Acidity of a base ?
Does domestic/household used kerosene oil which is available in blue color (In India) can change its color over the due course of time say 8-10 years if keeping in plastic bottle? If so, in which color it will be turned to change, yellow or transparent or any other color. Please provide me the reply with strong technical approach. Since it has been asked during an interview. Please reply fast. I will be thankful to you if anyone can provide the supporting journals/write-ups/reference to favour of response.
What is the colour of diamond, when pure ?