Which of the following group is NOT Dobereiner Triads?
The only non-metal which is liquid at room temperature is
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If a solution turns blue litmus red, its pH is likely to be
Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic table?
Non-metal oxides are usually
Which of the following processes will take place the slowest for the same quantity of liquid?
The percentage of carbon in CO2 is
A/an ___ flame is produced when the oxygen supply is sufficient.
In the modern periodic table, which of the two periods contain 8 elements each?