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

The salt of carbonic acids are called carbonates and are characterized by the carbonate ion, CO32-. The carbonate ion is the simplest oxocarbon anion, consisting of one carbon atom surrounded by three oxygen atoms in a trigonal planar arrangement.

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How to calculate oxidation numbers

Posted by Suhana Naaz 3 years, 10 months ago

CBSE > Class 11 > Chemistry

3 answers

Harsh Madhesiya 3 years, 9 months ago

Question- (C)O2 - We have to find the oxidation no. Of (C) ???????? Answer- let the oxidation no. Of (C) be(x). Now, X + 2(-2) =0 X-4=0 (X=+4)Ans. So, the oxidation no. Of (C) is (+4).

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Mannu Dahiya 3 years, 10 months ago

First u hace to leran or read the rules given in book

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Suhana Naaz 3 years, 10 months ago

Please send answer later

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if isotopic distribution of C12 and C1= is 98.0%and 2.0%respectively ,then the no. of C12 atoms in 12 g of carbon is

Posted by Harman Dhillon 3 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Anjan Karthi 3 years, 11 months ago

12 g of carbon would contain 6.022 × 10^23 atoms. Therefore, no of carbon-12 atoms in 12 g of carbon = 98/100 × 6.022 × 10^23 = 590.156 × 10^21.//

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write the formulas for calculating the radii and energy of stationary states?

Posted by Divansh Jamwal 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Sia ? 3 years, 11 months ago

The Bohr's energy of a stationary state of the hydrogen atom is given as En=n2h2−2πme4.

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Dikshant Sharma 3 years, 11 months ago

-2π^4me^4/n^2h^2

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write the formulas for calculating the radii and energy of stationary states

Posted by Divansh Jamwal 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Sia ? 3 years, 11 months ago

The Bohr's energy of a stationary state of the hydrogen atom is given as En=n2h2−2πme4.

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Dikshant Sharma 3 years, 11 months ago

-2π^2me^4/n^2h^2

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Calculate the mass per cent of different elements present in sodium sulphate

Posted by Himanshi Sharma 3 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 3 years, 11 months ago

Calculations:
Mass% of an element in a compound is calculated using the relation,
= {tex}\frac{\text { Mass of that element in the compound }}{\text { Molar mass of the compound }} \times{/tex}100
Now the molar mass of
Na₂SO₄ = 2(23.0) + 32.0 + 4 {tex}\times{/tex} 16.0
= 142 g mol^-1
So, Mass per cent of sodium
= {tex}\frac{46}{142} \times{/tex}100
= 32.39%
Similarly,
Mass per cent of sulphur
= {tex}\frac{32}{142} \times{/tex}100
= 22.54%
Mass per cent of oxygen
= {tex}\frac{64}{142} \times{/tex}100
= 45.07%

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Vasper siddhabt

Posted by Naman Bisht 3 years, 11 months ago

CBSE > Class 11 > Chemistry

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Chapter 9

Posted by Dropdi Devi 3 years, 11 months ago

CBSE > Class 11 > Chemistry

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The number of electrons,protons and neutrons in a species are equal to 18 , 16 and 16 respectively. Assign the proper symbol of the species.

Posted by Ayush Prasad 3 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Swayam Gupta 3 years, 11 months ago

S-²

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A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number os protons emitted per second by the bulb.

Posted by Karan Khan Khan 3 years, 11 months ago

CBSE > Class 11 > Chemistry

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A solution contains 40g of sodium chloride which is dissolved in sufficient amount of water to make the total mass of the solution 250g calculate the concentration in term of mass by volume percentage of the solution (density of resulting solution =1.5g/mol)

Posted by Arpita Singh 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Anjan Karthi 3 years, 11 months ago

Mass of solution W = 250 g. Density of solution D = 1.5 g/mol. Therefore, volume of solution = W / D = 250 / 1.5 = 166.6 cm^3. Hence, W / V% = 40 × 100 / 166.67 = 23.99 %. //

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Yaswanth Varma 3 years, 11 months ago

Jjj

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Caffeine has the following percent composition:carbon 49.48%,hydrogen 5.19%,oxygen 16.48% and nitogen 28.85%. Its molecular weight is 194g/mol. what is its empirical formula?What is the molecular formula?

Posted by Himshika Bista 3 years, 11 months ago

CBSE > Class 11 > Chemistry

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Which of the following has highest boiling point NO2 PH3 H2s H2o

Posted by Kalpna Kumari Preeti 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Utkarsh Anand 3 years, 11 months ago

Hay

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Gunasekaran Duraisamy 3 years, 11 months ago

No2

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An electron cannot exist in the nucleus whose radius is 10^-15 meter . Why ?

Posted by Harsha Shreya 3 years, 11 months ago

CBSE > Class 11 > Chemistry

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Isotope of hydrogen?

Posted by Akansha Rajput 3 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Anjan Karthi 3 years, 11 months ago

1) Protium (H with A = 1 and Z = 1.) 2) Deuterium (H with A = 2 and Z = 1.) 3) Tritium ( H with A = 3 and Z = 1)

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Explain isomerism.

Posted by Revanshi Grewal 3 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Ankit ............ 3 years, 11 months ago

Phenomenon in which more than one compound have same chemical formula but different chemical structure is different

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All masses of atom

Posted by Sid Gohiya 3 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Bhuvanesh Saraswat Pandit 3 years, 11 months ago

Same

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Need of atom

Posted by Sid Gohiya 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Anjan Karthi 3 years, 11 months ago

Every atom combines with other atoms to lower it's inbuilt ionisation energy and thereby, attain stability. This is the BASIC need for all atoms (Noble gases from Kr)

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G J 3 years, 11 months ago

Need of atom

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Which is the basic theme of organisations in the periodic table

Posted by Fiddusur Rahman 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Harshit Meena 3 years, 11 months ago

Atomic number

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Anjan Karthi 3 years, 11 months ago

1) Similar physical and Chemical properties of elements down the group. 2) Increasing order for atomic number by 1 unit across every period. 3) Similarity in electronic configuration of atoms down a group.

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Change of protons Charge of neutrons Charge of electrons

Posted by Akash Malsa 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Anjan Karthi 3 years, 11 months ago

Charge of protons = + 1.6 × 10 ^-19 C. Charge of electron = - 1.6 × 10^ -19 C. Charge of neutron = 0

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Akash Malsa 3 years, 11 months ago

Fast

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Which of the following hydrides are generally nonstochiometric in nature?

Posted by Ajitesh Kanojia 3 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Umang Gupta 3 years, 11 months ago

Saline hydrides

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How every elements of 1 mol(6.022×10^23 particles) have same volume,irrespective of their different masses?

Posted by Ritiya Kumari 3 years, 11 months ago

CBSE > Class 11 > Chemistry

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How to define electronic configuration

Posted by Uday Kumar Giri 3 years, 10 months ago

CBSE > Class 11 > Chemistry

2 answers

Saurabh Kumar 3 years, 11 months ago

The electron configuration is the distribution of electron of an atom or molecule in atomic or molecular orbitals.

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Jèôñ Āmbìkā 3 years, 11 months ago

The arrangement of electrons in energy levels around an atomic nucleus...is defined as electronic configuration...

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Find the orbital or electron for the given quantum number:- 1.n=2 , l=0 2.n=3 , l=2 , m=0 , s=1/2 3.n=4 , l=0 , m=0 , s=-1/2 4.n=6 , l=3 , m=-3 , s=-1/2

Posted by Paro ... 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Ashok Kumar 3 years, 10 months ago

1.2s 2. 3d³ 3.4s² 4.6f^8 I hope it helps u...

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Sanchita Meena 3 years, 11 months ago

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Name the alkines

Posted by Kisan Salunke 3 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Ankit ............ 3 years, 11 months ago

NaOH, KOH

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Find the conjugate of the complex numbers (i) -i√5

Posted by Anubhuti Chhetri 3 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Ashok Kumar 3 years, 10 months ago

i√5 ok.na

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Anurag Singh 3 years, 11 months ago

change of iorta sign

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Hemang Dubey 3 years, 11 months ago

Root 5 plus iorta

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Calculate all the four quantum no. Of last electron of Cr

Posted by Anjali Vasistha 3 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Anjan Karthi 3 years, 11 months ago

Cr = 1s2 2s2 2p6 3s2 3p6 3d5 4s1. Therefore, last electron is in 3d orbital. Quantum numbers are :- n = 3. l = 2. ml = 2. ms = 1/2.

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How to learn chemistry?? Especially GOC..

Posted by Mukul Kumar 3 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Sameer Kumar Tagore 3 years, 11 months ago

First you go through concept of organic chemistry in NCERT Book. Then make question by itself and answer if fell confident ,then make exercise question and internal question also ,finally you fell something I know about what actually organic chemistry after that you go on goc side book.

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Hemang Dubey 3 years, 11 months ago

Also be confident

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Harsh Singh 3 years, 11 months ago

By revising again and again and by doing lots of question practice

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