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6 months ago

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

CNG is an important transportation fuel. When 100g CNG is mixed with 208g oxygen in vechicles, it leads to the formation of CO₂ and H₂O and produces large quantity of heat during this combustion, then the amount of carbon dioxide produced in germs is ______.

(nearest integer)

[Assume CNG to be methane]

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Vishal Baghel

Contributor-Level 10

$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

Mole $\frac{100}{16} \frac{208}{32}$

$\begin{array}{l} ↓ ↓ \\ 6.25 6.5 (H e r e O_{2} i s t h e l i m i t i n g r e a g e n t) \end{array}$

Hence mole of CO₂ formed = $\frac{6.5}{2}$

And wt of CO₂ in gm = $\frac{6.5}{2} * 44 = 143 g$

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6 months ago

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

Which of the following is a water soluble vitamin, that is not excreted easily?

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Vishal Baghel

Contributor-Level 10

Vitamin B₁₂ is not water soluble chemical.

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6 months ago

Class 12th The S-block Elements

Which of the following sets are correct regarding polymer?

(A) Copolymer: Buna-S

(B) Condensation polymer: Nylon-6,6

(C) Fibres: Nylon-6,6

(D) Thermosetting polymer: Terylene

(E) Homopolymer: Buna-N

Choose the correct answer form given options below

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Payal Gupta

Contributor-Level 10

Buna-S is the copolymer of butadiene and styrene, Nylon-6, 6 is the condensation polymer of adipic acid and diamine and having fibrous nature.

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6 months ago

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

Which of the following in NOT an example of synthetic detergent?

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Vishal Baghel

Contributor-Level 10

CH₃ – (CH₂)₁₆ – COONa is the sodium salt of fatty acid used in soap is not synthetic detergent.

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6 months ago

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

The final product 'C' in the following series of reactions

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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6 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Ten

A water drop of radius $1 μ m$ falls in a situation where the effect of buoyant force is negligible. Co-efficient of viscosity of air is 1.8 * 10^-⁵ Nsm^-² and its density is negligible as compared to that of water 10⁶ gm^-³. Terminal velocity of the water drop is: