✕
  1. Tardigrade
  2. Question
  3. Chemistry
  4. Which pair of molecules has same reason of non-existance ? (I) IF32 - (II) H4Se (III) XeF42 - (IV) NCl5

Q. Which pair of molecules has same reason of non-existance ?
(I)
(II)
(III)
(IV)

NTA AbhyasNTA Abhyas 2020 Report Error

Solution:

are present at so it is unstable and does not exist. due to the absence of d-orbital contraction
Se can not form bond with hydrogen in its excited state.

Questions from NTA Abhyas 2020

1. Which reaction is suitable for preparing -Chloroacetic acid?

2. A mixture of methane and ethene in a molar ratio of has an average molecular mass of . The mean molar mass when they are mixed in the molar ratio of will be -

Some Basic Concepts of Chemistry

3. For a given reaction, energy of activation for forward reaction is and . A catalyst lowers to . The ratio of energy of activation for reverse reaction before and after addition of catalyst is:

Chemical Kinetics

4. 3 Faradays of electricity was passed through an aqueous solution of iron (II) bromide. The weight of iron metal (at. wt. = 56) deposited at the cathode (in g) is

Electrochemistry

5. Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E and compound E on further treatment with aqueous KOH yields compound F. Then compound F is

Aldehydes Ketones and Carboxylic Acids

Chemistry Most Viewed Questions

1. If for a certain reaction is at , the value of (in for which the same reaction will be spontaneous at the same temperature is

NEET 2020

2. If of a non-electrolyte solute is dissolved in of n-octane to reduce its vapour pressure to , the molar mass (in of the solute is [Given that molar mass of n-octane is

NEET 2020 Solutions

3. An organic compound contains (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of is is ]

NEET 2021 Some Basic Concepts of Chemistry

4. At standard conditions, if the change in the enthalpy for the following reaction is Given that bond energy of and is and , respectively, what is the bond energy (in of ?

NEET 2020

5. The density of 2 M aqueous solution of NaOH is 1.28 g/cm. The molality of the solution is
[Given that molecular mass of NaOH = 40 g mol]

NEET 2019 Some Basic Concepts of Chemistry

Latest Updates