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Ncert Solutions Chemistry Class 12th

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Ncert Solutions Chemistry Class 12th Class 12th

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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Ncert Solutions Chemistry Class 12th Class 12th

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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Ncert Solutions Chemistry Class 12th Class 12th

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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Ncert Solutions Chemistry Class 12th Class 12th

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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Ncert Solutions Chemistry Class 12th Class 12th

Incorrect order of Rate of Reduction among the following is:

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alok kumar singh

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DiBAL-H is electron deficient reducing agent as Burane and readily reduces electron rich sp.

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Ncert Solutions Chemistry Class 12th Class 12th

Choose the incorrect statement from the following:

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alok kumar singh

Contributor-Level 10

The slag formed is CaSIO₃ which is lighter and has less melting point.

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Ncert Solutions Chemistry Class 12th Class 12th

Incorrectly matched reaction among the following is:

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alok kumar singh

Contributor-Level 10

Ferdal Craft reaction not shown by Highly Activated Rings.

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Ncert Solutions Chemistry Class 12th Class 12th

In which of the following reaction amine is not obtained as a major product.

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alok kumar singh

Contributor-Level 10

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Ncert Solutions Chemistry Class 12th Class 12th

Which one is false in the following statements?

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alok kumar singh

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Fe acts a catalyst and Mo acts as promoter in Haber's process.

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Ncert Solutions Chemistry Class 12th Environmental chemistry

The BOD value of two samples of water are 4ppm and 18ppm, respectively and this indicates:

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Vishal Baghel

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BOD value less than 5ppm is considered as clean water and BOD value more than 10ppm is considered as polluted water.

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