Tags Ncert Solutions Chemistry Class 12th

Ncert Solutions Chemistry Class 12th

Get insights from 2.6k questions on Ncert Solutions Chemistry Class 12th, answered by students, alumni, and experts. You may also ask and answer any question you like about Ncert Solutions Chemistry Class 12th

Follow Ask Question

2.6k

Questions

Discussions

Active Users

Followers

New answer posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

Consider the following sulphur based oxoacids.

H₂SO₃, H₂SO₄, H₂S₂O₈ and H₂S₂O₇.

Amongst these oxoacids, the number of those with peroxo (O-O) bond is______________.

0 Follower 3 Views

Payal Gupta

Contributor-Level 10

Only H₂S₂O₈ has per-oxo bond.

0 0

New answer posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

Assuming 1 $μ g$ of trace radioactive element X with a half life of 30 years is absorbed by a growing tree. The amount of X remaining in the tree after 100 years is __________* 10^-1 $μ g$

[Given: In 10 = 2.303; log 2 = 0.30]

0 Follower 8 Views

Payal Gupta

Contributor-Level 10

$λ t = l n \frac{N_{o}}{N_{t}}$

$\frac{0.693}{t_{1 / 2}} * t = l n \frac{1}{N_{t}}$

Or $\frac{0.693 * 100}{30} = l n \frac{1}{N_{t}}$

$\frac{1}{N_{t}} = 10$

$∴ N_{t} = \frac{1}{10} = 0.1$

Or N_t = 1 * 101 $μ g$

0 0

New answer posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

1.80g of solute A was dissolved in 62.5cm³ of ethanol and freezing point of the solution was found to be 155.1 K . The molar mass of solute A is __________g mol^-1.

[Given: Freezing point of ethanol is 156.0 K. Density of ethanol is 0.80 g cm^-3. Freezing point depression constant of ethanol is 2.00 K kg mol^-1]

0 Follower 3 Views

Payal Gupta

Contributor-Level 10

$Δ T_{f} = K_{f} * m$

$(156 - 155.1) = 2 * \frac{1.8}{M W} * \frac{1000}{(62.5 * 0.8)}$

0.9 = $\frac{2 * 1.8 * 1000}{M W * 50}$

$∴ M W = 80 g m / m o l$

0 0

New question posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

If O₂ gas is bubbled through water at 303 K, the number of millimoles of O₂ gas that dissolve in 1 litre of water is______________. (Nearest integer)

(Given: Henry’s Law constant for O₂ at 303 K is 46.82 k bar and partial pressure of O₂ = 0.920 bar)

(Assume solubility of O₂ in water in too small, nearly negligible)

0 Follower

New answer posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

Ionic radii of cation A⁺ and anion B^- are 102 and 181 pm respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for B^-. A⁺ is present in all octahedral voids. The edge length of the unit cell of the crystal AB is________ pm.

(Nearest integer)

0 Follower 2 Views

Payal Gupta

Contributor-Level 10

$d = \frac{Z M}{N_{A} a^{3}} = \frac{4 * 58.5}{6.02 * 1 0^{23} * a^{3}}$

$43.1 = \frac{4 * 58.5}{6.02 * 1 0^{23} * a^{3}}$

$∴ a = 2.08 * 1 0^{- 8} c m$

$∴ r_{N a^{+}} + r_{C l^{-}} = 1.04 * 1 0^{- 10}$ m

0 0

New answer posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

The disproportionation of $M n O_{4}^{2 -}$ in acidic medium resultant in the formation of two manganese compounds A and B. If the oxidation state of Mn is B is smaller than that of A, then the spin-only magnetic moment $(μ)$ value of B in BM is___________.

(Nearest integer)

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

$M n O_{4}^{- 2} \to A + B$

Oxidation state of Mn in B < A

$M n O_{4}^{- 2} + H^{+} \to M n O_{4}^{-} + M n O_{2}$

B is MnO₂

$∴$ Oxidation state of Mn = +4

$∴_{25} M n^{+ 4} = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{0} 3 d^{3}$

$∴$ unpaired electron = 3

Spin only magnetic moment $(μ)$

$= \sqrt[]{n (n + 2)} = \sqrt[]{3 (3 + 2)} = \sqrt[]{15}$

$= 3.87 \approx 4$

0 0

New answer posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

The number of interhalogens from the following having square pyramidal structure is:

CIF₃, IF₇, BrF₅, BrF₃, I₂Cl₆, IF₅, ClF, ClF₅

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

$C l F_{3}$ -> T-shaped (sp³d)

IF₇ -> Pentagonal bipyramidal (sp³d³)

BrF₅ -> Square pyramidal (sp³d²)

BrF₃ -> T-Shaped (sp³d)

I₂Cl₆ -> Triangular bipyramidal (sp³d)

$I F_{5} \to$ Square Pyramidal (sp³d²)

ClF -> (sp³)

ClF₅ -> Square Pyramidal (sp³d²)

Br₅, IF₅ & ClF₅ -> Square Pyramidal

0 0

New answer posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

An element M crystallises in a body centred cubic unit cell with a cell edge of 300 pm. The density of the element is 6.0g cm^-3. The number of atoms in 180g of the element is_________* 10²³ (Nearest integer)

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

B.C.C structure

a = 300 pm = 300 * 10^-12 m

d = 6g/cm³

z = 2

$d = \frac{Z * M}{a^{3}}$

$6 = \frac{2 * A}{{(300 * 1 0^{- 10})}^{3}} = \frac{2 * A}{27 * 1 0^{- 24}}$

$∴ A t o m s o f M$ = 3.69 * 6.022 * 10²³

= 22.22 * 10²³

the nearest integer = 22

0 0

New answer posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

Number of grams of bromine that will completely react with 5.0g of pent-1-ene is_____________*10^-²g. (Atomic mass of Br = 80 g/mol) (Nearest Integer)

0 Follower 3 Views

Payal Gupta

Contributor-Level 10

Moles of Br₂= moles of C₅H₁₀= $\frac{5}{60 + 10} = \frac{5}{70}$

$∴ \frac{w}{160} = \frac{5}{70}$

$∴ w = \frac{5 * 160}{70} = \frac{80}{7} g$

$= 1142.8 * 1 0^{- 2} \approx 1143 * 1 0^{- 2} g$

0 0

New answer posted

3 months ago

Ncert Solutions Chemistry Class 12th Class 12th

If ${[C u {(H_{2} O)}_{4}]}^{2 +}$ absorbs a light of wavelength 600nm d-d transition, then the value of octahedral crystal field splitting energy for ${[C u {(H_{2} O)}_{6}]}^{2 +}$ will be_________* 10^-^21J. (Nearest Integer)

(Given: h = 6.63 * 10^-³⁴ Js and c = 3.08 * 10⁸ ms^-¹)

0 Follower 3 Views

Payal Gupta

Contributor-Level 10

$Δ_{t} = \frac{h c}{λ} = \frac{6.63 * 1 0^{- 34} * 3.08 * 1 0^{8}}{600 * 1 0^{- 9}}$

$= \frac{6.63 * 3.08 * 1 0^{- 17}}{600}$ J

$= 765.765 * 1 0^{- 21} J$

$? 766 * 1 0^{- 21}$ J

0 0

Get authentic answers from experts, students and alumni that you won't find anywhere else

On Shiksha, get access to

65k Colleges
1.2k Exams
679k Reviews
1800k Answers

Community GuidelinesUser Points System

QuestionsDiscussionsTags

Need guidance on career and education? Ask our experts

Your Question

Ncert Solutions Chemistry Class 12th

Questions

Discussions

Active Users

Followers

All

Discussions

Unanswered Questions

Share Your College Life Experience