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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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6 months ago

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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6 months 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 $π = \frac{22}{7}\}$