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

In metrology, measurement uncertainty is a non-negative parameter characterizing the dispersion of the value attributed to a measured quantity. All measurements are subjects to uncertainty and a measurement result is complete only when it is accompanied by a statement of the associated uncertainty.

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Difference between electron gain enthalpy and electronegativity

Posted by Alwin Shaji 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Ďãřşháñăã Yadav ? ? ? ✊ 7 years, 6 months ago

Electron gain enthalpy--> It is the measure of the tendency of an isolated gaseous atom to accept an electron, whereas Electronegativity------>is the measure of the tendency of an atom in a chemical compound to attract a shared pair of electrons towards itself.

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Calculate the molarity of 29m of CH3COOH is disolved in 4L

Posted by Helly Patel 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Give the main properties of canal ray experiment.

Posted by Ďãřşháñăã Yadav ? ? ? ✊ 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Aman Kumar 7 years, 6 months ago

Unlike cathode rays, canal rays depend upon the nature of gas present in the tube. It is because the canal rays are composed of positive ionized ions formed by the ioization of gas present in the tube...

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1 mole of nitrogen

Posted by Uttam Raghav 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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. . 7 years, 6 months ago

6.022×10^23 molecules of nitrogen Or 22.4 litre of nitrogen

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. In an inorganic compound , mass % of O =39.18, K = 3184 and Cl = 28.98. If molecular weight of the inorganic compound is 122.5, what is its molecular formula ? 19. 1.5 g of impure sodium sulphate on treating with excess of barium chloride solution gives 1.74 g BaSO4. What is the % purity of sodium sulphate in the sample? 20. Calculate the weight of Fe obtained by reducing 1 kg of ferric oxide. [Ans : 0.7 kg] 21. 10g sample of impure H2SO4. is treated with 7g chalk. The chalk left unreacted is 2.2 g. Calculate the % purity of H2SO4. 22. 1.2 g sample of impure sodium chloride on treatment with excess of AgNO3 solution gave 2.4g AgCl. Calculate the % purity of sodium chloride sample.

Posted by Lakshita Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Mass % in an inorganic compound is Na = 29.11, S = 40.51, O = 30.28 What is its empirical formula?

Posted by Lakshita Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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16. In an organic compound , the mass % of C = 85.8 and % H = 14.2. If vapour density of the compound is 28, what is its molecular formula?

Posted by Lakshita Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Ďãřşháñăã Yadav ? ? ? ✊ 7 years, 6 months ago

C6H12 is the molecular formula.

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. In an organic compound , C =4O%, H = 6.6 % and O = 53.4 %. If the VD of the organic compound is 30, what is its molecular formula ?

Posted by Lakshita Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Concentrated HNO3 is 69% by mass. What is the volume of the solution which contains 23g concentrated HNO3? Density of concentrated HNO3 is 1.41 g/cc.

Posted by Lakshita Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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What is hydrogen economy

Posted by Niraj Thakur 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Ďãřşháñăã Yadav ? ? ? ✊ 7 years, 6 months ago

Hydrogen economy is the use of liquid hydrogen as an alternate source of energy.

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Which element can have highest oxidation state ?.....

Posted by Ranjana Randhawa 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Aman Kumar 7 years, 6 months ago

Iridium has highest oxidation state.

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What is hund's rule

Posted by Jk Jha 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Aman Kumar 7 years, 6 months ago

Every orbital in a subshell must be occupied one electron with same spin and after filling of electrons in each orbital ,one more electron can be filled with opposite spin to each orbital...

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What is the individual oxidation state of the second carbon in C2H5OH

Posted by Anushka Gautam 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Ďãřşháñăã Yadav ? ? ? ✊ 7 years, 6 months ago

Here 6 hydrogen atoms are present, so +1*6 = +6. O = -2 Thus, +6-2 = +4 Here 2 carbon atoms are present in the equation. To reach oxidation state 2C = -4 C = -2. Hence,,, the oxidation number of C is -2

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Ďãřşháñăã Yadav ? ? ? ✊ 7 years, 6 months ago

The oxidation number of the two carbons together should be -4 . and each carbon is 2.

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Anushka Gautam 7 years, 6 months ago

Please anyone post the solution of this question fast as today is my exam

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what is planks constant?

Posted by Jk Jha 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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. . 7 years, 6 months ago

Planck's constant is h

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Aman Kumar 7 years, 6 months ago

Plank constant= M^1L^2T^-1 j/s

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Ďãřşháñăã Yadav ? ? ? ✊ 7 years, 6 months ago

The Plancks constant (h) can be defined as a proportionality constant that relates the energy (E) of a photon to the frequency (ν) of its associated electromagnetic wave.

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Anushka Gautam 7 years, 6 months ago

6.6×10^-34

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Manpreet Kaur 7 years, 6 months ago

Do you want defination

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What is the valency of hydride 1 or -1

Posted by Anushka Gautam 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Aman Kumar 7 years, 6 months ago

It has valency 1

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If an electron is travelling at 200m/s within 1m/s uncertainty what is the theoretical uncertainty in its position in micrometer. a)14.5 b)29 c)58 d)114. Please guys find o5 out and tell me it won't take much time

Posted by Tripti Sharma 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Ďãřşháñăã Yadav ? ? ? ✊ 7 years, 6 months ago

a) 14.5

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Although molecular mass of BeCl2 is less but BeCl2 is solid....Why

Posted by Minar Saxena 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Energy equivalent to 1cm-1 in joules

Posted by Anshul Choudhary 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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why water is liquid where as h2se is gas

Posted by Sahil Shah 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

this is because,, The presence of hydrogen bonding in water, results in more molecules per unit volume. Hence H2O is liquid. No such hydrogen bonding is seen in H2S.

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How is diboren prepared

Posted by Ajay Gautam 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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What is boiling point?

Posted by ब्राहम्ण Boy 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Aman Kumar 7 years, 6 months ago

In simple language, Boiling point is a point at which the substance's intermolecules rapidly moves and get easily boiled...This point is called boiling point. 2) Different substance has different boiling points.

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ब्राहम्ण Boy 7 years, 6 months ago

Maybe...?

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

ohhh seriously.. ?

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ब्राहम्ण Boy 7 years, 6 months ago

You are right?

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

The boiling point is the temperature at which the vapour pressure of the liquid is equal to the atmospheric pressure of the liquid and the liquid is converted to vapour.

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What is the oxigen

Posted by Akshaydamor Akshay 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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ब्राहम्ण Boy 7 years, 6 months ago

Hey your spelling means an online wallet like paytm.

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

it's oxygen... it is life supporting element of the air.

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12.Calculate the number of molecules of crystalline oxalic acid (H2C2O4 .2H2O) in 100 mL of 0.2M oxalic acid solution.

Posted by Lakshita Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

2 answers

Gaurav Kumar 7 years, 6 months ago

no. of mole = MV so,no of mole =0.1*0.2=1/50 so,1/50*6.023*10^23 =1.2046*10^22

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ब्राहम्ण Boy 7 years, 6 months ago

Maybe. 6.022 * 10^21...

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The mole fraction of H2SO4 in sulphuric acid solution is 0.15. What is the molality of the solution ?

Posted by Lakshita Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

molality of the solution is =9.8 I think

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What is the mole fraction of the urea in 2.5 m aqueous solution ?

Posted by Lakshita Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

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Aman Kumar 7 years, 6 months ago

2.5 m means , 2.5 moles of urea present in 1000 g of solvent.... No.of moles of urea= 2.5/60=1/24=0.041... No.of moles of water= 1000/18=55.5...... Therefore, Mole fraction= 0.041/0.041+55.5=0.041/55.541=0.0007... Ans

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ब्राहम्ण Boy 7 years, 6 months ago

Maybe 0.043

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Hydrogen bonding

Posted by Vinod Kumar 7 years, 6 months ago

CBSE > Class 11 > Chemistry