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Iodine could be separated from the mixture of iodine and Calcium chloride by
Which of the following elements is a metalloid?
If acidified K\(_2\)Cr\(_2\)O\(_7\) acts as an oxidizing agent, the colour changes from
The nucleus of a hydrogen atom consists of
If a gas occupies a volume of 400cm\(^3\) at a temperature of 400K and a pressure of 1 atm, at what temperature and pressure would its volume be 200cm\(^3\)?
Both Na\(^+\) and K\(^+\) have
Which of the following gases is used in fire extinguishers?
Aluminum is extracted by
Nickel is used in the hydrogenation of alkenes because it
Which of the following pairs of gases cannot be collected by downward delivery?
The 5\(^{th}\) member of an alkyne series is
The reaction above illustrated is
After breathing in a test tube that contains acidified K\(_2\)Cr\(_2\)O\(_7\), a man noticed a change in the colour of the acidified K\(_2\)Cr\(_2\)O\(_7\) from orange to green. This suggests the presence of
Find the hydrogen ion, H\(^+\) concentration and hydroxide ion, OH\(^-\) concentration in 0.06 moldm\(^{-3}\) solution of H\(_2\)SO\(_4\).
Bronze is used in making
In welding and cutting of metals, the organic gas commonly used in the heating process is
Freons pollution in the air are released from
What is the product obtained at the anode in the electrolysis of concentrated sodium chloride using graphite electrode?
How many molecules are there in 4.0 moles of glucose?
[Avogadro's number = 6.02 x 10\(^{23}\)]
In the equation above, the expression for the equilibrium constant, k\(_c\) is