CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

In order to determine the hybridization of sulfur tetrafluoride, you have to first understand its Lewis structure and the number of valence electrons that are present. The SF4 molecule consists of a total of 34 valence electrons. Here 6 will come from sulfur and each of the four fluorine atoms will have 7 electrons.

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What is the oxidising state of K in ko2

Posted by Subhash Kumar 6 years ago

CBSE > Class 11 > Chemistry

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Abhi Singh 6 years ago

In kO2 oxidation state of each oxygen is -1/2. let oxidation state of k in KO2 be x x+2(-1/2)=0 x=+1 hence, oxidation state of k is +1

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Why is the general configuration of f orbital (n-2)f1-14 (n-1)d 0-1 ns2

Posted by Praneetha Mudumba 6 years ago

CBSE > Class 11 > Chemistry

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Devil ? 6 years ago

Electrons are filled acc to their energy by using hunds pauli afbhau principle ...

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Difference between hard and soft water

Posted by Lalita Devi 6 years ago

CBSE > Class 11 > Chemistry

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Devil ? 6 years ago

Hard water contain calcium and magnesium choride and sulphate Soft water only contain calcium and magnesium hydroxide

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Abhi Singh 6 years ago

Hard water... is water that contains an appreciable quantity of dissolved minerals (like calcium and magnesium). Soft water... is treated water in which the only ion is sodium.

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Except which two elements the compound formed by s-block elements are predominently ionic in nature?

Posted by Tiyasha . 6 years ago

CBSE > Class 11 > Chemistry

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Manisha Tiwari 6 years ago

Lithium and Magnesium

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An electrochemical cell is a device that generates a potential difference between electrodes using chemical reactions. Galvanic cells and electrolytic cells are examples of electrochemical cells. A galvanic cell is constructed by using Zn and Cu electrodes such that the reduction potential (E0) of Zn and Cu are -0.76V and +0.34V. 1. Construct the above galvanic cell diagrammatically. 2. Write the anodic and cathodic reaction taking place. 3. Calculate the emf of the cell so constructed. 4. Write two functions of salt bridge. 5. What is the direction of flow of electron and current in the external circuit?

Posted by Aj Ranjan 6 years ago

CBSE > Class 11 > Chemistry

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Wgat is quantum number

Posted by Mubarak Hussain 6 years ago

CBSE > Class 11 > Chemistry

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Mubarak Hussain 6 years ago

*what

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Types of salt

Posted by Sujan Selva 6 years ago

CBSE > Class 11 > Chemistry

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Yogita Ingle 6 years ago

Salts can be classified into the following types:

a) Normal salt

A salt that does not contain any replaceable hydrogen ions is a normal salt. It is obtained by replacing all the hydrogen ions of an acid by metal ions or ammonium ions. Examples: NaCl, Na₂SO₄, Na₃PO₄, NH₄Cl, K₂CO₃, CuSO₄ etc.

b) Bisalts or Acid salts

A bisalt, or an acid salt contains replaceable hydrogen ions in association with the acidic radicals. It is obtained by the incomplete replacement of hydrogen ions by metal ions or ammonium ions.

Examples: NaHCO₃, NaH₂PO₄ and Na₂HPO₄.

Since such salts also contain hydrogen ion, the term 'bi' or acid can be substituted by hydrogen, e.g. sodium bicarbonate or sodium acid carbonate is also called sodium hydrogen carbonate.

When bisalts or acid salts dissociate in water, they yield hydrogen or hydronium ions.

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Very Important question of ch 1 and 2

Posted by Parshuram Singh 6 years ago

CBSE > Class 11 > Chemistry

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Gurmandeep Singh 6 years ago

Rutherford model,Bohr model,Rutherford scattering experiment, Aufbau principl,difference between atomic & emission spectra. Numerical of molality, molarity, normality.

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Effect of temperature on G(gibbs)

Posted by Sandeep Malviya 6 years ago

CBSE > Class 11 > Chemistry

1 answers

Manisha Tiwari 6 years ago

As gibbs free energy is equal to Enthalapy - temperature multiplied by entropy therefore if we increase the temperature value of gibbs free energy decreases or becomes negative or in simpler terms the reactions move towards spontaneity

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52 moles. Of Ar

Posted by Sahil Soni 6 years ago

CBSE > Class 11 > Chemistry

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Test for NaCl

Posted by Ujjawal Rana 6 years ago

CBSE > Class 11 > Chemistry

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Explain quantum numbers

Posted by Yashwant Shriwas 6 years ago

CBSE > Class 11 > Chemistry

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Yogita Ingle 6 years ago

Quantum numbers: Quantum numbers are numbers that designate and distinguish various atomic orbitals and electrons present in an atom.
Four quantum numbers are used to define the state of an electron completely, namely principal quantum number, azimuthal quantum number, magnetic quantum number and spin quantum number.

Principal quantum number:
Principal quantum number determines the energy shell in which an electron revolves around the nucleus.
Principal quantum number is also known as the major energy level.
Principal quantum number is denoted by the symbol n.
Principal Quantum Number (n) = 1, 2, 3, …….

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NH3 is larger then NF3

Posted by Jigmat Dorjay 6 years ago

CBSE > Class 11 > Chemistry

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Mr. Badmash 6 years ago

Dipole moment of NH3 is more than NF3

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What is the preparation method of sodium carbonate (washing soda) with reactions?

Posted by Bhaven Kumar 6 years ago

CBSE > Class 11 > Chemistry

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Gaurav Seth 6 years ago

Preparation :
When we heat baking soda then hydrogen gas released and sodium carbonate left.
When water is added to sodium carbonate then it becomes washing soda.
Equation :
2Nahco3 = Na2CO3 +h2O+co2
Na2CO3 +10h2O =Na2CO3.10H2O

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Prove that :-?h=?U+P?V

Posted by Sankhala Payal 6 years ago

CBSE > Class 11 > Chemistry

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E andZ confurgation

Posted by Radha Krishna 6 years ago

CBSE > Class 11 > Chemistry

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What is valence bond threory?

Posted by Vishesh Raja 6 years ago

CBSE > Class 11 > Chemistry

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Write the general electronic configuration of d-block elements?

Posted by Vishal Kumar 6 years ago

CBSE > Class 11 > Chemistry

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Yogita Ingle 6 years ago

Generally, the electronic configuration of these elements is (n-1) d ^1–10ns^1–2. The (n–1) remains for the inward d orbitals which may have one to ten electrons and the peripheral ns orbital may have one or two electrons. The d–block involves the middle area flanked by s– and p– blocks in the periodic table. The very name "transition" given to the elements of d-block is simply because of their position amongst s– and p– block elements. The d–orbitals of the penultimate energy level in their atoms get electrons leading to the three columns of the transition metals, i.e., 3d, 4d and 5d. The fourth line of 6d is still inadequate

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Explain electronic configuration in detail

Posted by Ishfaq Wani 6 years ago

CBSE > Class 11 > Chemistry

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Aryan Borasi 6 years ago

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s² 2s² 2p⁶, using the notation explained below.

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Gaurav Seth 6 years ago

Electronic configuration is defined as the distribution of electrons into various orbitals of an atom by using three principles.

Aufbau principle states that in the ground state of the atoms the orbitals are filled in order of their increasing energies. Electrons first occupy the lowest-energy orbital and then enter into successive higher energy orbitals. The electrons enter into various orbitals in an increasing order of (n+l).

Pauli's Exclusion Principle states that: An orbital can have maximum two electrons with opposite spin.

Hund's Rule of Maximum Multiplicity states that: Electron pairing in p, d and f orbitals cannot occur until each orbital of a given sub-shell contains one electron each or is singly occupied.

We can represent the electronic configuration of atoms in two ways.
Orbital diagram method
nlx method

Electronic configuration of the first ten elements - Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, and Neon given in following table.

After filling the 2p orbitals, the electrons fill into the 3s and then the 3p orbitals.

The electronic configurations of most of the elements can be write in a simplified manner or condensed form.

The eleventh electron in Sodium will enter the 3s orbital. Therefore, the electronic configuration of Sodium can also be written in a condensed form as [Ne] 3s¹.

Following table gives condensed form for elements from Sodium to Potassium.

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What happen when to lattice enthalpy of chloride of alkali metal down the group and why

Posted by Aakash Rajput 6 years ago

CBSE > Class 11 > Chemistry

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Why is benzene extra ordinarily stable through it contains three double bonds?

Posted by Debajyoti Mistri 6 years ago

CBSE > Class 11 > Chemistry

2 answers

Muskaan ? 6 years ago

Bond lngth longer

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Muskaan ? 6 years ago

Cyclic resonance

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what is BHC ? state it's uses ?

Posted by Neha Likhitkar 6 years ago

CBSE > Class 11 > Chemistry

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Tell me the difference between orbit and orbital.

Posted by Jugal Solanki 6 years ago

CBSE > Class 11 > Chemistry

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Sunita Kumari 6 years ago

Orbit -1 It is a well defined circular path where the electrons revolve 2 It represents the planar motion of electrons around the nucleus 3 The number of electrons present is 2nsquare electrons Orbital -1 It is a 3-D region

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State the main advantage of molality over molarity as the unit of concentration

Posted by Ashish Bhardwaj 6 years ago

CBSE > Class 11 > Chemistry