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Class 11th Block D and F Elements

Among the following oxides Cr₂O₃, V₂O₅, FeO, Mn₂O₇, ZnO, Cu₂O, MnO₂, CrO₃, NiO

If x = number of basic oxides

y = number of acidic oxides

z = number of amphoteric oxides

then the value of $\frac{(x + y)}{z}$ is

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Vishal Baghel

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Class 11th Chemistry

Consider the following orders given below.

(i) S > Se > Te > O (Electron Affinity)

(ii) $N^{- 3} > O^{2 -} > F^{-} > N a^{+} > M g^{2 +}$ (Ionic Size)

(ii) Fe²⁺ > Fe³⁺ > Fe⁴⁺ (Ionization Enthalpy)

(iv) H < B < P < C < Cl (Electronegativity)

(v) Na⁺ < Mg²⁺ < Al³⁺ (Extent of hydration)

(vi) Li > Na > K > Rb > Cs (Reducing Nature)

(vii) LiF(s) > LiCl(s) > LiBr(s) (Lattice Energy)

If x = number of correct orders

y = number of incorrect orders

then the value of $(1 + \frac{y}{x})$ is.

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Vishal Baghel

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Class 11th Chemistry

Nitric oxide is formed in the combustion of fuel. An internal combustion engine produces 600 ppm (600 mg L^-1) of NO was oxidized to NO₂. The NO₂ formed was dissolved in 10L of water. The pH of the resulting solution is

(log 2 = 0.30, log 3 = 0.48)

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Vishal Baghel

Contributor-Level 10

Moles of NO = $\frac{600 * 1 0^{- 3} * 100}{30} = 2$

$∴$ moles of NO₂ = 2

3NO₂ + H₂O -> 2HNO₃ + NO

$0.2 M \frac{0.4}{3} M o r p H = - l o g \frac{0.4}{3} = 0.88$

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Class 11th Chemistry

Find out the number of following orders which are INCORRECT against the mentioned properties:

(i) Ortho hydrogen > Para hydrogen (Stability at low temperature)

(ii) Ethanol > Glycerol (Viscosity)

(iii) D₂ < He (Boiling point)

(iv) HF > H₂O (Melting point)

(v) H₃BO₃ > BF₃ (Melting point)

(vi) NH₃ < SbH₃ (Boiling point)

(vii) H₂O₂ > H₂O (Strength of hydrogen bond)

(viii) H₂O < D₂O (Freezing point)

(ix) $H F_{2}^{Θ}$ < HF (Strength of hydrogen bond)

(x) D₂O < H₂O (Bond energy)

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Vishal Baghel

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Class 11th Chemistry

If x = Group number of Europium (atomic number 63)

y = Period number of Americium (atomic number 95)

z = Most stable oxidation state shown by Gadolinium (atomic number 64)

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Class 11th Physics Thermal Properties of Matter

Two rods of length d₁ and d₂ and coefficients of thermal conductivities K₁ and K₂ are kept touching each other. Both have the same area of cross?section, the equivalent thermal conductivity is

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Raj Pandey

Contributor-Level 9

When Two rods are connected in series

$Q = \frac{A (T_{1} - T_{2}) t}{\frac{d_{1}}{K_{1}} + \frac{d_{2}}{K_{1}}} = \frac{A (T_{1} - T_{2}) t}{(d_{1} + d_{2}) / K}$

$\frac{d_{1} + d_{2}}{K} = \frac{d_{1}}{K_{1}} + \frac{d_{2}}{K_{2}}$

$K = \frac{(d_{1} + d_{2})}{\frac{d_{1}}{K_{1}} + \frac{d_{2}}{K_{1}}}$

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Class 11th Physics

The diagram showing the variation of gravitational potential of earth with distance from the centre of earth is

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Raj Pandey

Contributor-Level 9

$V_{in} = \frac{- G M}{2 R} [3 - {(\frac{r}{R})}^{2}],$

$V_{s u r f a c e} = \frac{- G M}{R}, V_{out} = \frac{- G M}{r}$

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Class 11th Physics

A 20 kg block B is suspended from a cord attached to a 40 kg cart A. Find the ratio of the acceleration of block in cases (i) and (ii) shown in the figure immediately after the system is released from rest. (Neglect friction)