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Question Number 23294 Answers: 1 Comments: 2

Question Number 23288 Answers: 1 Comments: 3

A uniform chain of mass M and length L is hanging from the table. The chain is in limiting equilibrium when l length of chain over hangs. It is slightly disturbed from this position. Find the speed of the chain just after it completely comes off the table.

$A uniform chain of mass M and length$ $L is hanging from the table . The chain$ $is in limiting equilibrium when l length$ $of chain over hangs . It is slightly$ $disturbed from this position . Find the$ $speed of the chain just after it completely$ $comes off the table .$

Question Number 23274 Answers: 0 Comments: 2

Assertion: Both N_2 and NO^+ are diamagnetic substances. Reason: NO^+ is isoelectronic with N_2 .

$Assertion : Both N_{2} and {NO}^{+} are$ $diamagnetic substances .$ $Reason : {NO}^{+} is isoelectronic with N_{2} .$

Question Number 23272 Answers: 1 Comments: 1

Question Number 23270 Answers: 1 Comments: 0

The reaction CH_4 (g) + Cl_2 (g) → CH_3 Cl(g) + HCl(g) has ΔH = −25 kcal and bond dissociation energy of C − Cl, H − Cl, C − H and Cl − Cl is given as 84 kcal/mol, 103 kcal/mol, x kcal/mol and y kcal/mol respectively. Given x : y = 9 : 5, then bond energy of Cl − Cl bond in kcal/mol is

$The reaction {CH}_{4} (g) + {Cl}_{2} (g) \to {CH}_{3} Cl (g)$ $+ HCl (g) has Δ H = - 25 kcal and bond$ $dissociation energy of C - Cl, H - Cl,$ $C - H and Cl - Cl is given as 84 kcal / mol,$ $103 kcal / mol, x kcal / mol and y kcal / mol$ $respectively . Given x : y = 9 : 5, then$ $bond energy of Cl - Cl bond in kcal / mol$ $is$

Question Number 23237 Answers: 0 Comments: 6

Question Number 23224 Answers: 0 Comments: 4

Consider the system shown in the figure. Initially the system was in rest. (i) Find the acceleration of block if man climbs the rod with acceleration a (w.r.t. rod) (ii) If the man climb to the top of the rod then find the distance moved by the block.

$Consider the system shown in the$ $figure . Initially the system was in rest .$ $(i) Find the acceleration of block if man$ $climbs the rod with acceleration a (w . r . t .$ $rod)$ $(ii) If the man climb to the top of the$ $rod then find the distance moved by the$ $block .$

Question Number 23205 Answers: 0 Comments: 0

thank u.....

$t h a n k u . . . . .$

Question Number 23187 Answers: 0 Comments: 0

plz anyone answer the question 23181...plz plz plz...

$p l z a n y o n e a n s w e r t h e q u e s t i o n$ $23181 . . . p l z p l z p l z . . .$

Question Number 23181 Answers: 0 Comments: 2

show that the curve with parametric equcations x=t^2 −3t+5, y=t^3 +t^2 −10t+9 intersect at the point (3,1).

$s h o w t h a t t h e c u r v e w i t h p a r a m e t r i c$ $e q u c a t i o n s x = t^{2} - 3 t + 5,$ $y = t^{3} + t^{2} - 10 t + 9 i n t e r s e c t a t t h e$ $p o i n t (3, 1) .$

Question Number 23215 Answers: 0 Comments: 0

Assertion: The element with electronic configuration [Xe]^(54) 4f^1 5d^1 6s^2 is a d- block element. Reason: The last electron enters the d- orbital.

$Assertion : The element with electronic$ $configuration {[Xe]}^{54} 4 f^{1} 5 d^{1} 6 s^{2} is a d -$ $block element .$ $Reason : The last electron enters the d -$ $orbital .$

Question Number 23146 Answers: 0 Comments: 5

Square planar complex is formed by hybridisation of which atomic orbitals? (1) s, p_x , p_y , p_z (2) s, p_x , p_y , d_z^2 (3) s, p_x , p_y , d_(x^2 −y^2 ) (4) s, p_x , p_y , d_z^3

$Square planar complex is formed by$ $hybridisation of which atomic orbitals ?$ $(1) s, p_{x}, p_{y}, p_{z}$ $(2) s, p_{x}, p_{y}, d_{z^{2}}$ $(3) s, p_{x}, p_{y}, d_{x^{2} - y^{2}}$ $(4) s, p_{x}, p_{y}, d_{z^{3}}$

Question Number 23135 Answers: 1 Comments: 0

The standard enthalpy of formation of gaseous H_2 O at 298 K is −241.82 kJ mol^(−1) . Estimate its value of 100°C given the following values of the molar heat capacities at constant pressure: H_2 O(g) : 35.58 JK^(−1) mol^(−1) , H_2 (g) : 28.84 J mol^(−1) K^(−1) and O_2 (g) : 29.37 J mol^(−1) K^(−1) . Assume heat capacity to be independent of temperature.

$The standard enthalpy of formation of$ $gaseous H_{2} O at 298 K is - 241.82 kJ$ ${mol}^{- 1} . Estimate its value of 100 ° C given$ $the following values of the molar heat$ $capacities at constant pressure :$ $H_{2} O (g) : 35.58 {JK}^{- 1} {mol}^{- 1}, H_{2} (g) :$ $28.84 J {mol}^{- 1} K^{- 1} and O_{2} (g) : 29.37 J$ ${mol}^{- 1} K^{- 1} . Assume heat capacity to be$ $independent of temperature .$

Question Number 23130 Answers: 0 Comments: 1

A baloon filled with helium rises against gravity increasing its potential energy. The speed of the baloon also increases as it rises. How do you reconcile this with the law of conservation of mechanical energy? You can neglect viscous drag of air and assume that density of air is constant.

$A baloon filled with helium rises against$ $gravity increasing its potential energy .$ $The speed of the baloon also increases$ $as it rises . How do you reconcile this$ $with the law of conservation of$ $mechanical energy ? You can neglect$ $viscous drag of air and assume that$ $density of air is constant .$

Question Number 23109 Answers: 0 Comments: 1

Concourse started in 24 November and takes 12 days. Which date ends Concourse?

$C o n c o u r s e s t a r t e d i n 24 N o v e m b e r a n d t a k e s 12 d a y s .$ $W h i c h d a t e e n d s C o n c o u r s e ?$

Question Number 23104 Answers: 1 Comments: 0

show tht the curve with parametric equcations x=t^2 ,y=t^3 −9t intersect at the point (9,0).

$s h o w t h t t h e c u r v e w i t h p a r a m e t r i c e q u c a t i o n s$ $x = t^{2}, y = t^{3} - 9 t i n t e r s e c t a t t h e p o i n t (9, 0) .$

Question Number 23073 Answers: 1 Comments: 1

Question Number 23069 Answers: 0 Comments: 0

Why ionic radii of^(35) Cl <^(37) Cl^− ?

$Why ionic radii of^{35} Cl <^{37} {Cl}^{-} ?$

Question Number 23066 Answers: 1 Comments: 7

A rocket accelerates straight up by ejecting gas downwards. In a small time interval Δt, it ejects a gas of mass Δm at a relative speed u. Calculate KE of the entire system at t + Δt and t and show that the device that ejects gas does work = ((1/2))Δmu^2 in this time interval (neglect gravity).

$A rocket accelerates straight up by$ $ejecting gas downwards . In a small$ $time interval Δ t, it ejects a gas of mass$ $Δ m at a relative speed u . Calculate KE$ $of the entire system at t + Δ t and t and$ $show that the device that ejects gas$ $does work = (\frac{1}{2}) Δ {m u}^{2} in this time$ $interval (neglect gravity) .$

Question Number 23049 Answers: 1 Comments: 0

A particle of mass m strikes on ground with angle of incidence 45°. If coefficient of restitution, e = (1/(√2)) , find the velocity after impact and angle of reflection.

$A particle of mass m strikes on ground$ $with angle of incidence 45 ° . If coefficient$ $of restitution, e = \frac{1}{\sqrt{2}}, find the velocity$ $after impact and angle of reflection .$

Question Number 23022 Answers: 1 Comments: 5

what are the conditions necessary for a body of mass mkg on an incline plane at angle θ to the horizontal to remain at rest?

$w h a t a r e t h e c o n d i t i o n s n e c e s s a r y$ $f o r a b o d y o f m a s s m k g o n a n i n c l i n e p l a n e$ $a t a n g l e θ t o t h e h o r i z o n t a l t o$ $r e m a i n a t r e s t ?$

Question Number 22999 Answers: 0 Comments: 0

ΔH_f ^o of N_2 O is 82 kJ/mol and bond energy for N_2 , N = N, O = O and N = O bonds are 946, 418, 498 and 607 kJ/mol respectively, then resonance energy of N_2 O is

$Δ H_{f}^{o} of N_{2} O is 82 kJ / mol and bond$ $energy for N_{2}, N = N, O = O and N = O$ $bonds are 946, 418, 498 and 607 kJ / mol$ $respectively, then resonance energy of$ $N_{2} O is$

Question Number 22990 Answers: 1 Comments: 0

A train weighing 100 metric ton is running on a level track with a uniform speed of 72 km h^(−1) . If the frictional resistance amounts to 0.5 kg per metric ton, find the power of the engine.

$A train weighing 100 metric ton is$ $running on a level track with a uniform$ $speed of 72 km h^{- 1} . If the frictional$ $resistance amounts to 0.5 kg per metric$ $ton, find the power of the engine .$

Question Number 22993 Answers: 2 Comments: 0

For which of the following, the hydration energy of Mg^(2+) is larger? (1) Na^+ (2) Al^(3+) (3) Be^(2+) (4) Cr^(3+) .

$For which of the following, the$ $hydration energy of {Mg}^{2 +} is larger ?$ $(1) {Na}^{+}$ $(2) {Al}^{3 +}$ $(3) {Be}^{2 +}$ $(4) {Cr}^{3 +} .$

Question Number 22941 Answers: 1 Comments: 3

Question Number 22883 Answers: 1 Comments: 1

The correct order of second ionisation energy in the following : (a) F > O > N > C (b) O > F > N > C (c) O > N > F > C (d) C > N > O > F

$The correct order of second ionisation$ $energy in the following :$ $(a) F > O > N > C$ $(b) O > F > N > C$ $(c) O > N > F > C$ $(d) C > N > O > F$

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