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Class 12th Physics Magnetism and Matter

A paramagnetic sample shows a net magnetisation of $12 A / m$ when placed in an external magnetic field of $0.6 T$ at a temperature of $4 K$ . When the same sample is placed in an external magnetic field of $0.2 T$ at temperature of 16 k, the net magnetisation will be $A / m$ .

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Raj Pandey

Contributor-Level 9

$M = χ_{m} H$ and $_{} \frac{}{}$ $χ_{m} = \frac{C}{T} ($ Curie law $)$ ,

$M = \frac{C H}{T}$ or $\frac{M_{1}}{M_{2}} = \frac{C H_{1} / T_{1}}{C H_{2} / T_{2}} = (\frac{H_{1}}{H_{2}}) (\frac{T_{2}}{T_{1}})$ $\frac{_{}}{_{}} \frac{_{}_{}}{_{}_{}} (\frac{_{}}{_{}}) (\frac{_{}}{_{}})$

$M_{2} = M_{1} (\frac{H_{2}}{H_{1}}) (\frac{T_{1}}{T_{2}}) = 12 (A / m) [\frac{0.2 T}{0.6 T}] [\frac{4 K}{16 K}]$

$= 1 A / m$

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Class 12th Chemistry

In white phosphorous (P₄) if x is total number of triangle y is total number of plane of symmetry z is total number of P-P bond then calculate value of $\frac{(y + z)}{x} .$

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alok kumar singh

Contributor-Level 10

x = 4

y = 6

z = 6

Ans. (3)

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Class 12th Chemistry

One mole ideal monoatomic gas is heated in two different processes according to path AB and AC. If temperature of state B and state C are equal. Calculate $\frac{q_{A C}}{q_{A B}}$

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alok kumar singh

Contributor-Level 10

$C_{v} = \frac{3 R}{2}$

AC polytropic P $\propto$ V

$\Rightarrow P . V^{- 1} = c o n s t a n t$

$C_{A C} = C_{V} + \frac{R}{1 - (- 1)} = 2 R$

AB isobaric

$C_{A B} = C_{P} = \frac{5 R}{2}$

$∴ \frac{Q_{A C}}{Q_{A B}} = \frac{C_{A C}}{C_{A B}} [? Δ T s a m e f o r b o t h]$

$= \frac{2 R}{(\frac{5 R}{2})} = \frac{4}{5} = 0.8$

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Class 12th Chemistry

How many of the following reagent/s will liberate at least one oxide of nitrogen as a product?

(i) Ag + conc. HNO₃

(ii) Sn + dil., HNO₃ (20%)

(iii) Cu + conc. HNO₃

(iv) C + conc. HNO₃

(v) Zn + conc. HNO₃

(vi) Zn + dil. HNO₃ (20%)

(vii) P₄ + conc. HNO₃

(viii) S₈ + conc. HNO₃

(ix) Cu + dil. HNO₃ (20%)

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alok kumar singh

Contributor-Level 10

(i) give NO₂ (ii) NH₄NO₃ (iii) gives NO₂ (iv) Give NO₂ (v) give NO₂ (vi) Given N₂O

(vii) Gives NO₂ (viii) Gives NO₂ (ix) Gives NO

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Class 12th Coordination Compounds

Which of the following is not an example of σ-bonded organometallic complex?

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Vishal Baghel

Contributor-Level 10

σ bonded organometallic compound ⇒ M – C
σ-bond
and in π – bonded organo metallic compound
M – C
π bond
In ferrocene, there is π-bond

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Class 12th Solutions

What volume in ml of 5 M H₂SO₄ should be added to 150ml of 1 M H₂SO₄ to obtain a solution of molarity = 2.5 M, if upon mixing volume of solution decreases by 10%?

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alok kumar singh

Contributor-Level 10

Let V ml is taken

$\frac{5 * V + 1 * 150}{(V + 150) + 0.9} = 2.5$

5V + 150 = 2.25 V + 337.5

$V = \frac{187.5}{2.75} = 68.18 m l$

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Class 12th Physics Magnetism and Matter

A circular loop of radius R = 20 cm is placed in a uniform magnetic field B = 7 T in x-y plane as shown in figure. The loop carries a current $i = 1.0 A$ in the direction shown in figure. The magnitude of torque acting on the loop is__ N.m. Take $π = \frac{22}{7}\}$

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Raj Pandey

Contributor-Level 9

Kindly consider the following Image

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New question posted

a year ago

Class 12th Physics Magnetism and Matter

A circular loop of radius R= 20cm is placed in a uniform magnetic field b= 7 T in x-y plane as shown in figure. The loop carries a current $i = 1.0 A$ in the direction shown in figure. The magnitude of torque acting on the loop is__ N.m. Take $π = \frac{22}{7}\}$

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a year ago

Class 12th Biomolecules

Select the incorrect statement.

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alok kumar singh

Contributor-Level 10

Kiliani Fischer method is for upgradation of C-chain.

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Class 12th Chemistry

Which of the following cation produces ppt. with only one of the given condition

(I) In aqueous solution produce ppt with dil. HCl

(II) In acidic aqueous solution produce ppt with H₂S

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alok kumar singh

Contributor-Level 10

A, B and C can be precipitated by HCl as well as H₂S as their insoluble chlorides and sulphides.

(D) Sn⁺² can be precipitated by H₂S but not by HCl

$S n^{+ 2} + 2 H C l \to S n C l_{2} (s o l u b l e)$

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