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6 months ago

Class 11th Physics Gravitation

The volume occupied by the molecules contained in 4.5Kg water at STP, if the intermolecular forces vanish away is :

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Raj Pandey

Contributor-Level 9

$\begin{array}{r} V = (no. of moles) (22.4 litre) \\ = \frac{mass}{molar mass} (22.4 * 10^{- 3} m^{3}) \\ = \frac{4.5 * 10^{3}}{18} * 22.4 * 10^{- 3} m^{3} \\ = 5.6 m^{3} \end{array}$

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6 months ago

Class 11th physics ncert solutions class 11th

Two pendulums of length 121cm and 100cm start vibrating in phase. At some instant, the two are at their mean position in the same phase. The minimum number of vibrations of the shorter pendulum after which the two are again in phase at the mean position is :

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Raj Pandey

Contributor-Level 9

(n) $(1.1) = (n + 1)$

$0.1 (n) = 1$

$n = 10$

Required number of oscillation $= n + 1 = 10 + 1 = 11$

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6 months ago

Class 11th Equilibrium

What mass of 95% pure CaCO₃ will be require neutralise 50 mL of 0.5M HCl solution according to the following reaction?
CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + 2H₂O(l) [Calculate upto second place of decimal point]

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Vishal Baghel

Contributor-Level 10

Moles of HCl = (50 / 1000) * 0.5 = 0.025 moles
So, moles of CaCO? used = 0.025 / 2 = 0.0125 moles = 1.25 g
95% (Total mass of CaCO? ) = 1.25 g
Total mass of CaCO? = 1.25 / 0.95 = 1.32 g

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6 months ago

Class 11th Physics Oscillations

A series LCR circuit with inductance $10 H$ , capacitance $10 μ F$ , resistance $50 Ω$ is connected to an ac source of voltage, $V = 200 s i n ? (100 t)$ volt. If the resonant frequency of the LCR circuit is $v_{0}$ and the frequency of the ac source is $v$ , then

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Raj Pandey

Contributor-Level 9

$ω = 100$

$v = \frac{ω}{2 π} = \frac{100}{2 π} = \frac{50}{π} H z$

Resonance frequency

$v_{0} = \frac{1}{2 π \sqrt[]{L C}} = \frac{1}{2 π} \sqrt[]{\frac{1}{10 * 10 * 10^{- 6}}}$

$= \frac{50}{π} H z$

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6 months ago

Class 11th Chemistry

Which one is not correct mathematical equation for Dalton's Law of partial pressure? Here p = total pressure of gaseous mixture.

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Vishal Baghel

Contributor-Level 10

p? = p? x? is not a correct form of Dalton's law of partial pressures.

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6 months ago

Class 11th Chemistry

Amongst the following which one will have maximum lone pair -lone pair' electron repulsions?

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Vishal Baghel

Contributor-Level 10

Maximum lone pair - lone pair repulsions are there in XeF?

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6 months ago

Class 11th Physics

A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q

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Raj Pandey

Contributor-Level 9

Resistance of P & Q should be approximately equal as it decreases error in experiment.

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6 months ago

Class 11th Structure of Atom

Identify the incorrect statement from the following.

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Vishal Baghel

Contributor-Level 10

Shapes of d? ²? ² and d? ² are not similar to each other.

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6 months ago

Class 11th Work, Energy and Power

A particle is released from height $S$ from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively:

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alok kumar singh

Contributor-Level 10

$U + K E = E$

$4 U = E = m g S$

$4 m g h = m g S$

$h = \frac{S}{4}$

$v = \sqrt[]{2 g (\frac{3 S}{4})} = \sqrt[]{\frac{3 g S}{2}}$

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6 months ago

Class 11th Chemistry

Given below are two statements:

Statement I:
The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group.

Statement II:
o-nitrophenol, m-nitrophenol and p-nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring.

In the light of the above statements, choose the most appropriate answer from the options given below:

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Vishal Baghel

Contributor-Level 10

At different positions -NO? affects acidic strength differently. The order of acidic strength is p-nitrophenol > o-nitrophenol > m-nitrophenol.

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