Chemistry
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New answer posted
9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: Ice creams are emulsions which get stabilised by emulsifying agents like gelatin.
New answer posted
9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: Clouds are colloidal in nature and carry charge. Spray of silver iodide, an electrolyte, results in coagulation leading to rain.
New answer posted
9 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (ii)
An oxidizing agent in (A) and reducing agent in (B)
H2O2 acts as an oxidising agent in A as it oxidized iodine from -1 to 0, while in B it acts as reducing agent as it reduced chlorine from +1 to -1
New answer posted
9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: Gold sol is a lyophobic sol. Addition of gelatin stabilises the gold sol.
New answer posted
9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: At lower concentration soap forms a normal electrolytic solution with water. After a certain concentration called critical micelle concentration, colloidal solution is formed.
New answer posted
9 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (iii)
Tritium
The tritium concentration is about one atom per 1018 atoms of protium. Of these isotopes, only tritium is radioactive and emits low energy beta particles.
New answer posted
9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: Chemisorption involves formation of bond between gaseous molecules/atoms and the solid surface for which high activation energy is required. Thus it is referred to as activated adsorption.
New answer posted
9 months agoContributor-Level 10
This is a Short Answers Type Questions as classified in NCERT Exemplar
Ans: It is important to have clean surface as it facilitates the adsorption of desired species.
New answer posted
9 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (iv)
CH4
These hydrides have the required number of electrons to write their conventional Lewis structures.
New answer posted
9 months agoContributor-Level 10
This is a Long Answers Type Questions as classified in NCERT Exemplar
Ans: Catalytic reaction which depends on the pore structure of catalyst and size of the reactant, product molecules is known as shape-selective catalysis. Zeolites are considered as good shape-selective catalysts due to their honeycomb-like structures. They are aluminosilicates with three-dimensional network of silicates wherein some of the silicon atoms are replaced by aluminium atoms giving Al-O-Si frame work. The reactions taking place in zeolites depends upon size and shape of reactant and product molecules, the pores and cavities of the zeolites also. They are fo
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