The Halogens (Group VIIA) include fluorine, chlorine, bromine, iodine, and astatine, known for their high reactivity and tendency to form salts when combined with metals. The Noble Gases (Group VIIIA), such as helium, neon, argon, krypton, xenon, and radon, are colorless, odorless, and inert gases with a stable electron configuration, making them largely unreactive.
Chemistry Class 12 Chapter 5 Notes
The oxidation of NO in air produces: NO2
Laughing gas is chemically: N2O
Out of all the elements of groups VI-A the highest melting and boiling points is shown by the element: Po
Oxidation of NO in air produces: N2O4
Maximum number of unpaired electrons is in: O2
Out of all the elements of Group V-A the highest ionization energy is possessed by: N
Gold dissolves in “Aqua Regia” due to formation of Halide. Point out correct halide: AuCl3
The brown gas formed, when metal reduce HNO3: NO2
Which catalyst is used in contact process: V2O5
In group V-A elements the most electronegative elements is: N
Out of all the elements of group VA, the highest ionization energy is possessed by: N
The brown gas formed when metal reduces HNO3: NO2
Which metal is redered passive by HNO3due to formation of a film of metal oxide over the metal: CO
Which of the following is a reddish brown gas: NO2
What is %age of calcium phosphate in bone ash: 80
Which of the following gives acidic oxide: N
The most electronegative element of group V-A is: N
Which acid can not be stored in glass bottles: HF
_____ is use as a cooling medium for nuclear reactors:He
Stability of halogen molecules decreases from: Cl2 to I2
An element that has a high ionization energy and tends to be chemically inactive would most likely to be: A noble gas
XeF6 n hydrolysis produces: XeOF4
The anhydride of HCIO4 is: Cl2O7
Which one of the following uses is not correctly related with the halogen: Bromine —————PVC plastics
Colour of which halogen is not correctly related: F2 — colourless gas
Which one of the following acids acts as oxidizing agent but never a reducing agent: HCIO4
Iodine deficiency in diet is known to cause: Goiter
Important : Review all previous years’ 12 class past papers for comprehensive practice and better exam preparation.