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find the magnitude of charge present in 2.4g Mg 2+

Posted by Rajesh Kumar 6 years, 6 months ago

1 answers

Sia ? 6 years, 6 months ago

No of moles of Mg⁺² ion = given weight/molar weight
here,
given weight = 2.4 g
molar weight = 24 g/mol
No of moles of Mg⁺² ion = 2.4/24
= 0.1 mol
we can see that in one mole of Mg⁺² ion , 0.1 mole electrons occur
so, in two moles of Mg⁺² ions = 0.1×2 moles of electrons occur .

now, no of electrons = no of mole of electrons× Avogadro's constant
= 0.2 × 6.023 × 10²³ = 1.2046 × 10²³
we also know, charge of one electron = 1.6× 10^-19 C
so, charge by total electrons = 1.2046 × 10²³ × 1.6 × 10^-19 C
= 1.92736 × 10⁴ C

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When 18.04g of a non volatile solute is dissolved in 100g of water. The vapour pressure of latter was lowered from 17.535mm Hg to 17mmHg at 20°C . Calculate molar mass of substance?

Posted by Ganga Sudheer 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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We can get 2nd hand refresher

Posted by Adarsh Jain 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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How are 0.50 moles NaCo3 and 0.50M are different

Posted by Storm Shadow 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Which of the following is correct? (a) Mole fraction of I + Mole fraction of II= 1 (b) Mole fraction of I/Mole fraction of II = mole of I/Mole of II (c) Mole fraction of solute = Moles of solute/ Moles of solute+ moles of solvent (d) All of the above

Posted by Nisha Solanki 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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8mole of water in number of particle

Posted by J Roshan 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Limiting reagents

Posted by Sanjay Singh 6 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 6 months ago

The limiting reagent in a chemical reaction is the substance that is totally consumed when the chemical reaction is complete.

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Calculate the thermometer using different temperature scales

Posted by Jennifer Khuinamei 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Whats are atom

Posted by Shreya Singh 6 years, 6 months ago

CBSE > Class 11 > Chemistry

2 answers

Adarsh Dwivedi 6 years, 6 months ago

Atoms are those particle or element which can no be divisible

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A D 6 years, 6 months ago

Atom is pure form of elements consist of same element. Eg.ca atoms consist only calcium as element.

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If 1 dm^3 of a gas weighs 2.5 g at STP, then what will be its gram molecular weight? ( I want complete solution..plzz)

Posted by .. .. 6 years, 6 months ago

CBSE > Class 11 > Chemistry

3 answers

Esha Pal 6 years, 6 months ago

Hii

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.. .. 6 years, 6 months ago

Ya hello

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Esha Pal 6 years, 6 months ago

Hii gungun do u remember me .????

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To calculate the mass of a single atom of sodium 23 g calcium 40 g

Posted by Manohar Atal 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Why electron gain enthalpy of metal is low while of non metal is high

Posted by Vinit Gupta 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Deepak Tippan 6 years, 6 months ago

Because metal can easily lose electron as compared to non metals

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The first ionisation energy of Na,Mg and Si are 496,737 and 786 KJ mole-1 respectively. The ionisation potential of Si will be closer to the first ionisation energy of which above elements.Why?

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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In which of the following compounds the ionic radius of Cr is minimum? K2CrO4,CrF3,CrO2,CrCl3

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

2 answers

Bhjana Ram 6 years, 6 months ago

Bhad mein jayo

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Sangita Sharma 6 years, 6 months ago

Pata nahii,???

3Thank You

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Why are Heg of Be and Mg positive?

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Among the elements B,Al,C and Si:- (a)Which element has the lightest first ionisation energy? (b)Which element has the most mettalic character?Justify.

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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What are the values of n,l,mand s for 19 e- in Cr? (Atomic number=24)

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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How many atomic orbitals are there in fourth energy level of an atom?

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Ionisation Energy of He+ is 19.6×10-18J atom-1.The energy of first stationary state of Li2+ will be___________.

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Calculate the accelerating potential that must be applied on a proton beam to give it an effective wavelength 0.005Nm

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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In H-atom the energy of electron in n orbit is given by En+1-En=13.6×2/n3ev for large values of 'n'.

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Two particles A and B are moving with same velocity but wavelength of A is found to be double than that of B.What do you conclude?

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 6 months ago

The magnitude of the relative velocity will remain same, i.e., no effect on its magnitude.

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The radius of first Bohr orbit of H-atom is 0.59A°.What will be the radius of third orbit of He+ ion?

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Which of the following transition will have minimum wavelength? (a)n4 to n1 (b)n2 to n1 (c)n4 to n2n2 (d)n3 to n1

Posted by Bhjana Ram 6 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

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Define average atomic mass

Posted by Blessy Bency 6 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Thakur Nobody 6 years, 6 months ago

The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).

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What is Paradox of fractional oxidation number?

Posted by Rugved Khune 6 years, 6 months ago

CBSE > Class 11 > Chemistry

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Numericals on ch1 on all the concept

Posted by Yash Bagri 6 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

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Question based on wavelength both theory and numerical

Posted by Rohit Nagar 6 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

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Write 5 vharacteristics of 1. S block elements 2. P block elements 3. D block elements 4. F block elements

Posted by Prateek Thakur 6 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

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what is vital force theory

Posted by Ram Rokaya 6 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

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