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Chemistry NCERT Exemplar Solutions Class 12th Chapter Three

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2 months ago

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

Among the given oxides of nitrogen ; N₂O, N₂O₃, N₂O₄ and N₂O₅, the number of compound / (s) having N – N bond is:

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alok kumar singh

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

Among the following, basic oxide is:

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alok kumar singh

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CaO – Basic Oxide

SO₃ & SiO₂ – Acidic oxides

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

Hydrogen has three isotopes : protium (¹H), deuterium (²H or D) and tritium (³H or T). They have nearly same chemical properties but different physical properties. They differ in

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alok kumar singh

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Isotopes are the atom of same element with different atomic mass.

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Three Class 11th

In the metallurgical extraction of copper, following reaction is used:

FeO + SiO₂ ® FeSiO₃

FeO and FeSiO₃

FeO and FeSiO₃ respectively are.

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alok kumar singh

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In extraction of copper from copper pyrite (CuFeS₂).

FeS converted to FeO as;

$\underset{G a n g u e}{2 F e S} + 3 O_{2} \overset{Δ}{\to} \underset{G a n g u e}{2 F e O} + 2 S O_{2}$

Then FeO is removed as slag by given reaction

FeO + SiO₂ ® $\underset{S l a g}{F e S i O_{3}}$

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Three Redox Reactions

Match List – I with List – II:

List – I (Oxide) List – II (Nature)

(A) Cl₂O₇ &

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alok kumar singh

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· Cl₂O₇ being non-metallic oxide is acidic in nature.

· Na₂O being metallic oxide is basic in nature.

· Al₂O₃ is an amphoteric oxide

· N₂O is neutral oxide

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Three Class 11th

Match List – I with List – II:

List – I List – II

(a) Negatively charged sol

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alok kumar singh

Contributor-Level 10

Metallic suphides i.e CdS are negatively charged colloidal solution.

Starch colloid is macro molecular colloidal solution.

Fe₂O₃. xH₂O sol is positively charged colloidal solution.

Cheese is an example of gel.

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Three Electrochemistry

Which statement is not true with respect to nitrate ion test?

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Payal Gupta

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Brown ring is formed due to nitrosoferrous sulphate formation.

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Three Classification of Elements and Periodicity in Prop

An evacuated glass vessel weights 40.0g when empty, 135.0g when filled with a liquid of density 0.95 g mL^-¹ and 40.5 g when filled with an ideal gas at 0.82 atm at 250 K. The molar mass of the gas in g mo^-¹ is:

(Given: R = 0.082 L atm K^-¹ mol^-¹)

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Payal Gupta

Contributor-Level 10

Wt of liquid = 135 – 40 = 95 gm

Volume of liquid = $\frac{w t .}{d e n s i t y} = \frac{95}{0.95} = 100 m l$

Hence volume of vessel = 100 ml = 0.1 lit from ideal gas equation,

$M = \frac{d R T}{P} = \frac{0.5}{0.1} * \frac{0.0821 * 250}{0.82}$

$∴ M = 125 g / m o l$

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

The ionic radii of $O^{2 -}, F^{-}, {N a}^{+}$ and ${M g}^{2 +}$ are in the order:

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alok kumar singh

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$O^{2 -} > F^{-} > {N a}^{+} > {M g}^{2 +}$ . Greater the Zeff, smaller is size.

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

The elements with atomic numbers 101 and 104 belong to, respectively:

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alok kumar singh

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$Z = 101$ belong to actinoids

104 belong to group 4

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