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10 (i) 1.15g of metallic Na react with excess of water . How many moles of H2 are formed and what volume of H2 is formed at S.T.P ? (II) How many moles of Pb(NO3)2 are required to produce 48 g of O2 ? (III) Calculate amount of KCLO3 needed to supply sufficient O2 for the burning of 112L of CO2 at N.T.P ?

Posted by Rihaan Shadaf 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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9 A welding fuel gas contains C and H only. Burning a small sample of it in O2 gives 3.38g of CO2 , .690g of H2O and no other product . A volume of 10 L (measured at N.T.P ) of this welding gas is found to weighs 11.6g. Calculate (i) empirical formula (ii) molecular mass (iii) molecular formula of the welding gas ?

Posted by Rihaan Shadaf 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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8. The % composition of a substance is P =32.63 , 0 =16.82 & S = 50.55. The V.D of substance is 190. Find the molecular formula of the substance .

Posted by Rihaan Shadaf 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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8. The % composition of a substance is P =32.63 , 0 =16.82 & S = 50.55. The V.D of substance is 190. Find the molecular formula of the substance . 9 A welding fuel gas contains C and H only. Burning a small sample of it in O2 gives 3.38g of CO2 , .690g of H2O and no other product . A volume of 10 L (measured at N.T.P ) of this welding gas is found to weighs 11.6g. Calculate (i) empirical formula (ii) molecular mass (iii) molecular formula of the welding gas ? 10 (i) 1.15g of metallic Na react with excess of water . How many moles of H2 are formed and what volume of H2 is formed at S.T.P ? (II) How many moles of Pb(NO3)2 are required to produce 48 g of O2 ? (III) Calculate amount of KCLO3 needed to supply sufficient O2 for the burning of 112L of CO2 at N.T.P ?

Posted by Rihaan Shadaf 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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5 20 cc of 1N HCL , 30 CC of 0.5N H2SO4 and 50CC of 0.2 N HNO3 are mixed together .What will be the normality of the final solution ?

Posted by Rihaan Shadaf 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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What is ion electron method.....???

Posted by Naira(奈拉)..... ?️⚡?️⚡ ??? 4 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years, 11 months ago

Write the skeletal equation and indicate the oxidation number of all the elements which occur in skeletal equation
Find out the species that are oxidized and reduced.
Split the skeletal equation into two half reactions: oxidation half reaction and reduction half reaction
Balance the two-half equation separately by rules described below:

In each half reaction first balance the atoms of element that has undergone a change in oxidation number.
Add electrons to whatever side is necessary to make up the difference in oxidation number in each half reaction.
Balance the charge by adding H⁺ ions, if the reaction occurs in acidic medium .For basic medium, add OH^- ions if the reaction occurs in basic medium.
Balance oxygen atoms by adding required number of water molecules to the side deficient in oxygen atoms
In the acidic medium, H atoms are balanced by adding H ⁺ ions to the side deficient in H atoms.
However, in the basic medium H atoms are balanced by adding water molecules equal to number to H atoms deficient.
Add equal number of OH^- ions to opposite side of equation.
The two half reactions are then multiplied by suitable integers .so that the total number of electrons gained in half reaction becomes equal to total number of electrons lost in another half reaction.
Then the two half reactions are added up.
To verify the balancing, check whether the total charge on either is equal or not.

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what is 1molal solution ✍️ pls? ans me ????

Posted by Yogita Ingle 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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Yogita Ingle 4 years, 11 months ago

Molality is defined as the “total moles of a solute contained in a kilogram of a solvent.”
A molal solution is one that contains 1 mol of a solute in 1000g or kg of the solvent.
Molality (m)=Moles of solute / Mass of solvent in kg

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Explain the formation of H2 molecule on the basis of valance bond theory

Posted by Harsh Sharma 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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Name an animal having organ level of organization, bilaterally symetrical, acoelomate

Posted by Ashrita Naik 4 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Khushi Dahiya 4 years, 11 months ago

Flatworms

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If the kinetic of an electron increased by 44% find the %change on its de broglie wavelength

Posted by Dolfi Guleria 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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Tomorrow is my chemistry exam... Feeling nervous?..love u..?

Posted by Sadul Sharma 4 years, 11 months ago

CBSE > Class 11 > Chemistry

5 answers

Yash Rai 4 years, 11 months ago

Mera bhi hai bhai , best of luck

1Thank You

Nayma Majied 4 years, 11 months ago

Best of luck

1Thank You

V Harini 4 years, 11 months ago

?all the best

2Thank You

Maahi ......♾ 4 years, 11 months ago

All the best for tomorrow ??

2Thank You

Ganika Arora 4 years, 11 months ago

Best of luck ??

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Convert the Following.. Alkanes to Alchol Alkanes to higher alkanes Alkanes to alkynes Alkanes to alkenes Alkanes to Aldehyde Alkanes to ketones Alkanes to benzene Alkanes to cyclohexane Fir someone special..Mr.Aadya Singh Others can also give answers ??

Posted by Sadul Sharma 4 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Sadul Sharma 4 years, 11 months ago

Okk Miss. Aadya singh??

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🤟Royal Thakur 🤟 4 years, 11 months ago

? I think you should prefer YouTube for this........

3Thank You

Aadya Singh 4 years, 11 months ago

Sorry.... Haven't studied it yet ?...
aur Mr. nhi miss bolo?

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Which is the more stable mgcl2 or nacl

Posted by Vineet Gurjar 4 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Sadul Sharma 4 years, 11 months ago

NaCl

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If 4g of NaoH dissolves in 36g of H2O, calculate the mole fraction oeacheomponent in the solution, also determine the molarity of solution(specific gravity of solution 1g mL power -1

Posted by Vedha ..... 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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ANSWER

How many atoms in 2.3 gram sodium

Posted by Arushi Singh 4 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Mansi Jadhav 4 years, 11 months ago

Na= 23 2.3 gram No.of NA atom = 6.022×10^23×2.3/23=6.022×10^23

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ANSWER

Round up 1. 35.217 2. 11.4108 3. 0.5577 4. 2806

Posted by Vedha ..... 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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ANSWER

Scientific notation: 1. 0.0040 2. 243.000 3. 8008 4. 500.0

Posted by Vedha ..... 4 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years, 11 months ago

(i) 0.0040 can be written in scientific notation as 4.0×10⁻³.
(ii) 234,000 can be written in scientific notation as 2.34×10⁵.
(3 8008 can be written in scientific notation as 8.008×10^3.
(4) 500.0 can be written in scientific notation as 5.000×10².

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What is the difference between 104 cm and 104.0cm

Posted by Vedha ..... 4 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Prabhat Singh 4 years, 11 months ago

104cm has 3 significant figure and 104.0 cm had 4 significant figure

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How many moles are present in 8g of calcium

Posted by Vedha ..... 4 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Aarsh Muley 4 years, 11 months ago

0.2 moles

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Yogita Ingle 4 years, 11 months ago

1 mole of atoms = Gram atomic mass

So, 1 mole of Ca atoms=Gram atomic mass of Ca

=40g

Now, 40 g of calcium = 1 mole of calcium

So, 8 g of calcium =1/40×5 mole

=1/5 mole

=0.2 mole

Thus,there are 0.2 mole in 8 g of calcium.

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Prabhat Singh 4 years, 11 months ago

8 ×avagadro no.

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Give an example of molecular in six times of empirical formula

Posted by Vedha ..... 4 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years, 11 months ago

The compound is glucoe. Its molecular formula is C₆H₁₂O₆C₆H₁₂O₆ while empirical formula is CH₂O

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The body temperature of healthy person 300 degree Celsius. Calculate into Farenheit

Posted by Vedha ..... 4 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years, 11 months ago

F° = 1.8(°C) + 32

F° = 1.8(300) + 32

F° = 540+ 32

F° = 572

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Value of one mole

Posted by Vedha ..... 4 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Yash Rai 4 years, 11 months ago

6.022×10^-23

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Sheetla Dewangan 4 years, 11 months ago

1 mole = 6.022*10^23

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Yogita Ingle 4 years, 11 months ago

A mole is defined as that amount of substance which contains Avogadro's number of atoms if the substance is atomic or Avogadro's number of molecules if the substance is molecular. 1 mole of carbon atoms = 6.022 ×10²³ atoms of carbon.

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The amount of co2 gas produced by the combustion of 32 g of methane

Posted by Shranavi Yemulwar 4 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Vivek Kumar 4 years, 11 months ago

88 gms of CO2

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Parisha Dahiya 4 years, 11 months ago

89.6g co2

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Law of multiple proportion ...??

Posted by 🤟Royal Thakur 🤟 4 years, 11 months ago

CBSE > Class 11 > Chemistry

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If kinetic energy of an electron is increased four times, the de broglie wavelength associated with it will become??

Posted by Priyanshu Priyam 4 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Vivek Kumar 4 years, 11 months ago

If kinetic energy is increased by 4 times , velocity is increased by 2 times, ½mv² ×4 = ½ m(2v)² Put the value of v in de broglie eqn. λ = h/m(V) = h/m(2v) = ½ h/mv

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Priyanshu Priyam 4 years, 11 months ago

But how??

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Jyoti Sinha 4 years, 11 months ago

1/2 times

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What is absobe spectrum

Posted by Aayush Kumar 4 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years, 11 months ago

An absorption spectrum is constituted by the frequencies of light transmitted with dark bands when energy is absorbed by the electrons in the ground state to reach higher energy states.

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Hyberidization and shape geometry of H2SO4

Posted by Srushti Ubale 4 years, 11 months ago

CBSE > Class 11 > Chemistry