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Class 11th Chemistry

Number of lone pair(s) of electrons on central atom and the shape of BrF₃ molecule respectively.

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Class 11th Units and Measurement

In a vernier calipers, each cm on the main scale is divided into 20 equal parts. If tenth vernier scale division coincides with nineth main scale division. Then the value of vernier constant will be__________* 10^-²mm.

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Raj Pandey

Contributor-Level 9

Let 'x' he the value of one division of main scale

$x = \frac{1}{20} c m = 0.05 c m$

Let y be value of one division on venire scale given

10 y = 9 x

$y = \frac{9 x}{10}$

Least count = $x - \frac{9 x}{10} = \frac{x}{10} = \frac{0.05}{10}$

= 0.005 cm

= 5 * 10^-2 mm

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Class 11th Chemistry

Amongst baking soda, caustic soda and washing soda, carbonate anion is present

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Vishal Baghel

Contributor-Level 10

Baking soda = NaHCO₃

Washing soda = Na₂CO₃. 10H₂O

Caustic soda = NaOH

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Class 11th Chemistry

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.

Assertion (A) : The first ionization enthalpy for oxygen is lower than that of nitrogen

Reason (R) : The four electrons in 2p orbitals of oxygen experience more electron electorn repulsion.

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

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Vishal Baghel

Contributor-Level 10

1^st ionization energy of N>O in oxygen atom, 2 electrons out of 4 electron of 2p orbital resulting in an increased electron repulsion.

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Class 11th Physics Mechanical Properties of Solids

The elongation of a wire on the surface of the earth is 10^-⁴m. The same wire of same dimensions is elongated by 6 * 10^-⁵ m on another planet. The acceleration due to gravity on the planet will be__________ms^-². (Take acceleration due to gravity on the surface of earth = 10 ms^-²)

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Raj Pandey

Contributor-Level 9

$Δ L$ (change in length) $= \frac{F l}{A E} = \frac{m g l}{A E}$

$Δ l \propto g$

$\frac{Δ l_{1}}{g_{1}} = \frac{Δ l_{2}}{g_{2}} \Rightarrow \frac{1 0^{- 4}}{10} = \frac{6 * 1 0^{- 5}}{g_{1}}$

$g_{1} = \frac{6 * 1 0^{- 4}}{1 0^{- 4}} =$ 6 m/sec²

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Class 11th Equilibrium

4.0 moles of argon and 5.0 moles of PCl₅ are introduced into an evacuated flask of 100 litre capacity at 610 K. The system is allowed to equilibrate. At equilibrium, the total pressure of mixture was found to be 6.0 atm. The K_p for the reaction is

[Given R = 0.082 L atm K^-1 mol^-1]

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Vishal Baghel

Contributor-Level 10

Moles of PCl₅ = 5 mol

Moles of Ar = 4 mol

Total no of moles = 9 moles

$P_{T o t a l} = \frac{n R T}{V} = \frac{9 * 0.0821 * 610}{100} = 4.5 a t m$

$P_{P C l_{5}} = X_{P C l_{5}} * P_{T} = \frac{5}{9} * 4.5 = 2.5 a t m$

$P_{A r} = X_{A r} * P_{T} = \frac{4}{9} * 4.5 = 2 a t m$

$P C l_{5} \overset{}{?} P C l_{3} + C l_{2}$

2.5 0 0

2.5 - P P P

$P_{T o t a l} = 2.5 - P + P + P + P_{A r} = 6$

P = 1.5

...more

Moles of PCl₅ = 5 mol

Moles of Ar = 4 mol

Total no of moles = 9 moles

$P_{T o t a l} = \frac{n R T}{V} = \frac{9 * 0.0821 * 610}{100} = 4.5 a t m$

$P_{P C l_{5}} = X_{P C l_{5}} * P_{T} = \frac{5}{9} * 4.5 = 2.5 a t m$

$P_{A r} = X_{A r} * P_{T} = \frac{4}{9} * 4.5 = 2 a t m$

$P C l_{5} \overset{}{?} P C l_{3} + C l_{2}$

2.5 0 0

2.5 - P P P

$P_{T o t a l} = 2.5 - P + P + P + P_{A r} = 6$

P = 1.5 atm

$K_{P} = \frac{1.5 * 1.5}{1} = 2.25$

less

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Class 11th Physics Mechanical Properties of Solids

The elastic behavior of material for linear stress and linear strain, is shown in the figure. The energy density for a linear strain of 5 * 10^-⁴ is __________KJ/m³. Assume that material is elastic upto the linear strain of 5 * 10^-⁴.

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Raj Pandey

Contributor-Level 9

$Y = \frac{σ}{\in} = \frac{20}{1 0^{- 10}},$ Y → young's modules of elasticity.

Stress $(σ)$ at strain $(\in)$ 5 * 10^-4

$σ = \in Y$

$= 5 * 1 0^{- 4} * 20 * 1 0^{10}$

= $1 0^{2} * 1 0^{6}$

= 10⁸

$U_{d} (E n e r g y d e n s i t y) = \frac{1}{2} σ \in$

$= \frac{1}{2} * 1 0^{8} * 5 * 1 0^{- 4}$

$\begin{array}{l} = 2.5 * 1 0^{4} \\ = 25 * 1 0^{3} = 25 k J / m^{3} \end{array}$

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Class 11th Chemistry Chemical Bonding and Molecular Structure

Consider the species CH₄, $N H_{4}^{+} a n d B H_{4}^{-} .$ Choose the correct option with respect to the there species

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Class 11th Chemistry Organic Chemistry

Given below are two statements:

Statement I: In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.

Statement II: If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to given NaCN and Na₂S.

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

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alok kumar singh

Contributor-Level 10

Regarding Lassaigne's Test, both statement are correct.

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Class 11th Structure of Atom

Which of the following is the correct plot for the probability density $ψ^{2} (r)$ as a function of distance 'r' of the electron from the nucleus for 2s orbital?

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Vishal Baghel

Contributor-Level 10

For 2S, number of radial moles = $n - l - 1 = 2 - 0 - 1 = 1$ and $Ψ^{2} (r)$ will always be positive

$∴ o p t i o n (B) i s c o r r e c t ?$ it has one radial node and it is positive.

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