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7 months ago

Class 11th Physics Motion in Straight Line

If the velocity-time graph has the shape AMB, what would be the shape of the corresponding acceleration-time graph?

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alok kumar singh

Contributor-Level 10

For part AM, slope of v – t graph is constant but negative. For part MB, slope of v – t graph is constant but positive.

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7 months ago

Class 11th Physics Thermal Properties of Matter

Each side of a box made of metal sheet in cubic shape is 'a' at room temperature 'T', the coefficient of linear expansion of the metal sheet is 'a'. The metal sheet is heated uniformly, bya small temperature $Δ T,$ so that its new temperature is T + $Δ T .$ Calculate the increase in the volume of the metal box.

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alok kumar singh

Contributor-Level 10

$γ = 3 α$

$Δ V = γ V Δ T = 3 α . a^{3} . Δ T$

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7 months ago

Class 11th Chemistry

For a chemical reaction A + B $?$ C + D

$(Δ_{r} H^{Θ} = 80 k J m o l^{- 1})$ the entropy change $Δ_{r} S^{Θ}$ depends on the temperature T (in K) as $Δ_{r} S^{Θ} = 2 T (J K^{- 1} m o l^{- 1}) .$

Minimum temperature at which it will become spontaneous is-------------K. (Integer)

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Payal Gupta

Contributor-Level 10

$Δ_{r} H^{o} = 80 k J m o l^{- 1}$

$Δ_{r} S^{o} = 2 T k J m o l^{- 1}$

For a reaction to be spontaneous;

$Δ_{r} S^{o} > \frac{Δ_{r} H^{o}}{T}$

$T > \frac{Δ_{r} H^{o}}{Δ_{r} S^{o}}$

$T > \frac{80 * 1 0^{3}}{2 T}$

$T^{2} > 40000 K$

$T > 200 K$

So, minimum T at which reaction will be spontaneous is 200 K.

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7 months ago

Class 11th Chemistry Some Basic Concepts of Chemistry

The number of significant figures in 50000.020 * 10^-3 is………………

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Payal Gupta

Contributor-Level 10

50000.020 * 10^-3

The significant figure in the given number is 8.

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7 months ago

Class 11th Chemical Equilibrium

An homogeneous ideal gaseous reaction $A B_{2 (g)} ? A_{(g)} + 2 B_{(g)}$ is carried out in a 25 litre flask at 27°C. The initial amount of AB₂ was 1 mole and the equilibrium pressure was 1.9atm. The value of K_p is x * 10^-2. The value of x is-----------. (Integer answer).

[R = 0.08206 dm³ atm K^-1 mol^-1]

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Payal Gupta

Contributor-Level 10

$A B_{2} (g) ? A (g) + 2 B (g)$

Initial1 mole -

At equilirbium 1-x mole x mole2x mole

V = 25 L and

T = 300 K.

At equilibrium, P = 1.9 atm

Total moles at equilibrium, n = 1 + 2x

V = 25 L

T = 300 K

Using, PV = nRT

1.9 * 25 = (1 + 2x) * 0.08206 * 300

x = 0.465

Now;Partial pressure of AB2 at equilibrium = $\frac{0.535}{1.93} * 1.9 a t m$

Using ; $K_{p} = \frac{P_{A} . P_{B}^{2}}{P_{A B_{2}}}$

$K_{p} = \frac{(\frac{0.465 * 1.9}{1.93}) {(\frac{2 * 0.465}{1.93} * 1.9)}^{2}}{\frac{0.535}{1.93} * 1.9}$ = 0.728

K_P = 0.73

K_p = 73 * 10^-2

So; x = 73

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7 months ago

Class 11th Chemistry

A certain gas obeys $P (V_{m} - b) = R T .$ The value of ${(\frac{\partial z}{\partial P})}_{T} i s \frac{x b}{R T} .$ The value of x is------------.

(Integer answer) (Z : compressibility factor)

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Payal Gupta

Contributor-Level 10

$P (V_{m} - b) = R T$

$\frac{P V_{m}}{R T} - \frac{P b}{R T} = 1$

$Z = 1 + \frac{P b}{R T}$

${(\frac{\partial z}{\partial P})}_{T} = \frac{b}{R T}$

So, comparing with $\frac{x b}{R T}$

x = 1

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7 months ago

Class 11th Chemistry

Statements about heavy water are given below

(a) Heavy water is used in exchange reaction for the study of reaction mechanisms.

(b) Heavy water is prepared by exhaustive electrolysis of water

(c) Heavy water has higher boiling point than ordinary water.

(d) Viscosity of H₂O is greater than D₂O.

Choose the most appropriate answer from the options given below:

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Payal Gupta

Contributor-Level 10

Heavy water (D₂O) is used in organic reaction to know the kinetics of reaction

Heavy water D₂O is obtained by repeated electrolysis of H₂O.

Heavy water has b.pt 101.4°C and ordinary water has b.pt 100°C

(b.pt of D₂O > b.pt of H₂O)

D₂O has more molecular mass than H₂O, so greater degree of association and hence greater b.pt and viscosity.

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7 months ago

Class 11th Structure of Atom

The orbital having two radial as well as two angular nodes is

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Payal Gupta

Contributor-Level 10

Radial node = n $l -$ 1 (5d)

= 5 – 2 – 1 = 2

Angular node = $l$

= 2

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7 months ago

Class 11th Chemistry

Which of the following vitamin is helpful is delaying the blood clotting?

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Payal Gupta

Contributor-Level 10

Vitamin E is helpful in delaying blood clotting while vitamin K help blood clotting.

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7 months ago

Class 11th Chemistry

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

Assertion A : Dipole – dipole interactions are the only non- covalent interaction, resulting in hydrogen bond formation.

Reason R : Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical.

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

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Payal Gupta

Contributor-Level 10

Not all dipole – dipole interactions are responsible for hydrogen bonding, so assertion A is false. F is most E. N atom and also hydrogen bonds in HF are symmetrical.

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