Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
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Which of the following elements has the lowest melting point?
The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 3rd group and the 4th period?
Alpha particles are ___________.
Fe has 26 protons in its nucleus. What are the number of electrons in Fe2+ (II) ion?
The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.
Chemical formula for sulphurous acid is:
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