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This is a Short Answers Type Questions as classified in NCERT Exemplar

Ans: The colloidal impurities present in water get coagulated by added alum, thus making water potable.

This is a Short Answers Type Questions as classified in NCERT Exemplar

Ans: It is a 4% solution of nitrocellulose in a mixture of alcohol and ether.

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.

This is a multiple choice answer as classified in NCERT Exemplar

Option (ii)

BaO₂ -8H₂O

Hydrogen peroxide is produced by acidifying barium peroxide and eliminating excess water by evaporation under low pressure.

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.

Yes, candidates need to have a valid score in INICET for admission in MS programme of AIIMS Raebareli. All India Institute of Medical Sciences (AIIMS) Delhi conducts the INICET  for admission to PG courses. The test is conducted twice in a year at national-level in computer-based mode. Candidates need to participate in INICET counselling after the test to get a seat in MS programme of AIIMS Raebareli.

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

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.

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.

The RRB JE 2025 CBT 2 result will be released zone-wise in the form of a PDF. It will consist of the roll numbers of candidates shortlisted for document verification & medical examination.

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.

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.

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.

Aspirants targeting AIIMS Raebareli for MBBS programme must follow the below steps to increase their chance of getting admission:

• Fill as many choices as possible in counselling
• Keep AIIMS Raebareli higher than other colleges
• Participate in Round 2 or Mop-up rounds as many studebts leave their seats for other AIIMS or private options

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.

This is a Long Answers Type Questions as classified in NCERT Exemplar

Ans: This method is used for removing gangue from sulphide ores. In this, a suspension of powdered ore is made with water. To which both the collectors and froth stabilisers are added. Collectors for example pine oils, fatty acids, xanthates enhance non-wettability of the mineral particles and froth stabilisers such as cresols, aniline stabilise the froth.

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Option (ii)

LiH < NaH < KH < RbH < CsH

In ionic hydride as it is formed by the s-Block element, down the group, electropositive character increases.

This is a Long Answers Type Questions as classified in NCERT Exemplar

Ans:  (i) Separation of inert gases: Due to a difference in the degree of adsorption of gases by charcoal, a mixture of noble gases can be separated by adsorption on coconut, a charcoal at different temperatures.

(ii) Adsorption indicators: Surfaces of certain precipitates such as silver halides have the property of adsorbing some dyes like eosin, fluorescein, and so produce a characteristic colour at end point.

(iii) Chromatographic analysis: It is based on the phenomenon of adsorption and has a number of applications in analytical and industrial fields.

This is a multiple choice answer as classified in NCERT Exemplar

option (iv)

Loss of an electron from a hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to its small size it cannot exist free.

Loss of the electron from hydrogen atom results in nucleus size (H⁺) of 1.5 × 10^-3. This is extremely small as compared to normal atomic and ionic sizes of 50 to 200 pm. As a consequence, H⁺ does not exist freely and is always associated with other atoms or molecules.