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Question Number 22879 Answers: 1 Comments: 0

The Enthalpy of neutralization of acetic acid and sodium hydroxide is −55.4 kJ. What is the enthalpy of ionisation of acetic acid?

$The Enthalpy of neutralization of$ $acetic acid and sodium hydroxide is$ $- 55.4 kJ . What is the enthalpy of$ $ionisation of acetic acid ?$

Question Number 22884 Answers: 1 Comments: 0

A body of mass 0.3 kg is taken up an inclined plane of length 10 m and height 5 m, and then allowed to slide down to the bottom again. The coefficient of friction between the body and the plane is 0.15. What is the kinetic energy of the body at the end of the trip?

$A body of mass 0.3 kg is taken up an$ $inclined plane of length 10 m and$ $height 5 m, and then allowed to slide$ $down to the bottom again . The$ $coefficient of friction between the body$ $and the plane is 0.15 . What is the$ $kinetic energy of the body at the end of$ $the trip ?$

Question Number 22837 Answers: 0 Comments: 0

The effective nuclear charge of N on its last electron is:−

$The effective nuclear charge of N on its$ $last electron is : -$

Question Number 22813 Answers: 1 Comments: 0

The nucleus Fe^(57) emits a γ-ray of energy 14.4 keV. If the mass of the nucleus is 56.935 u, calculate the recoil energy of nucleus.

$The nucleus {Fe}^{57} emits a γ - ray of energy$ $14.4 keV . If the mass of the nucleus is$ $56.935 u, calculate the recoil energy of$ $nucleus .$

Question Number 22797 Answers: 1 Comments: 0

He^+ in ground state is hit by photon thus exciting electron to second excited state. The energy absorbed in this process is (approx) (1) 2.18 × 10^(−14) J (2) 7.75 × 10^(−18) J (3) 4.5 × 10^(−18) J (4) 5 × 10^(−18) J

${He}^{+} in ground state is hit by photon$ $thus exciting electron to second excited$ $state . The energy absorbed in this$ $process is (approx)$ $(1) 2.18 \times 10^{- 14} J$ $(2) 7.75 \times 10^{- 18} J$ $(3) 4.5 \times 10^{- 18} J$ $(4) 5 \times 10^{- 18} J$

Question Number 22782 Answers: 0 Comments: 6

Successive ionisation energies of element is 738, 1450, 10540, 13630 kJ/mole respectively. The element is (1) Na (2) Mg (3) Al (4) K

$Successive ionisation energies of$ $element is 738, 1450, 10540, 13630$ $kJ / mole respectively . The element is$ $(1) Na$ $(2) Mg$ $(3) Al$ $(4) K$

Question Number 22744 Answers: 0 Comments: 1

How can i copy and paste from this keyboard to other apps in my mobile? i can copy but can not getting paste in other apps. what to do?

$How can i copy and paste from this$ $keyboard to other apps in my mobile ? i can copy but$ $can not getting paste in other apps .$ $what to do ?$

Question Number 22743 Answers: 1 Comments: 0

The Enthalpy of neutralization of acetic acid and sodium hydroxide is −55.4 kJ. What is the enthalpy of ionisation of acetic acid?

$The Enthalpy of neutralization of$ $acetic acid and sodium hydroxide is$ $- 55.4 kJ . What is the enthalpy of$ $ionisation of acetic acid ?$

Question Number 22703 Answers: 1 Comments: 1

Question Number 22692 Answers: 1 Comments: 1

Question Number 22679 Answers: 0 Comments: 3

Maximum covalency of nitrogen is equal to

$Maximum covalency of nitrogen is$ $equal to$

Question Number 22657 Answers: 0 Comments: 0

A real image 3 times the size of the object formed by a concave mirror on a screen. later both the object & the screen are shifted untill the image formed is 6 times the size of the object. if the distnce moved is 15cm. calculate the focal length of the mirror.

$A r e a l i m a g e 3 t i m e s t h e s i z e o f t h e$ $o b j e c t f o r m e d b y a c o n c a v e m i r r o r$ $o n a s c r e e n . l a t e r b o t h t h e o b j e c t$ $& t h e s c r e e n a r e s h i f t e d u n t i l l t h e$ $i m a g e f o r m e d i s 6 t i m e s t h e s i z e$ $o f t h e o b j e c t . i f t h e d i s t n c e m o v e d$ $i s 15 c m . c a l c u l a t e t h e f o c a l l e n g t h$ $o f t h e m i r r o r .$

Question Number 22652 Answers: 0 Comments: 0

Find the number of unordered pairs {A, B} (i.e., the pairs {A, B} and {B, A} are considered to be the same) of subsets of an n-element set X which satisfy the conditions: (a) A ≠ B; (b) A ∪ B = X [e.g., if X = {a, b, c, d}, then {{a, b}, {b, c, d}}, {{a}, {b, c, d}}, {φ, {a, b, c, d}} are some of the admissible pairs.]

$Find the number of unordered pairs$ ${A, B} (i . e ., the pairs {A, B} and {B, A}$ $are considered to be the same) of$ $subsets of an n - element set X which$ $satisfy the conditions :$ $(a) A \neq B;$ $(b) A \cup B = X$ $[e . g ., if X = {a, b, c, d}, then {{a, b},$ ${b, c, d}}, {{a}, {b, c, d}}, {ϕ, {a, b, c, d}}$ $are some of the admissible pairs .]$

Question Number 22624 Answers: 1 Comments: 0

A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, calculate work required to pull the hanging part on the table.

$A uniform chain of length L and mass$ $M is lying on a smooth table and one$ $third of its length is hanging vertically$ $down over the edge of the table . If g is$ $acceleration due to gravity, calculate$ $work required to pull the hanging part$ $on the table .$

Question Number 23793 Answers: 1 Comments: 1

Question Number 22594 Answers: 1 Comments: 0

ΔH_f ^o of water is −285.8 kJ mol^(−1) . If enthalpy of neutralization of monoacid strong base is −57.3 kJ mol^(−1) , ΔH_f ^o of OH^− ion will be

$Δ H_{f}^{o} of water is - 285.8 kJ {mol}^{- 1} . If$ $enthalpy of neutralization of monoacid$ $strong base is - 57.3 kJ {mol}^{- 1}, Δ H_{f}^{o} of$ ${OH}^{-} ion will be$

Question Number 22582 Answers: 1 Comments: 2

A chain consisting of 5 links each of mass 0.1 kg is lifted vertically with a constant acceleration of 2 m/s^2 . The force of interaction (in newton) between the top link and the link immediately below it will be : Take g = 10 m/s^2 .

$A chain consisting of 5 links each of$ $mass 0.1 kg is lifted vertically with a$ $constant acceleration of 2 m / s^{2} . The$ $force of interaction (in newton) between$ $the top link and the link immediately$ $below it will be :$ $Take g = 10 m / s^{2} .$

Question Number 22574 Answers: 1 Comments: 1

The system is initially at origin and is moving with a velocity (3 m/s) k^∧ . A force (120t newton) i^∧ acts on mass m_2 , where t is time in seconds. The man throws a light ball, at the instant when m_1 starts slipping on m_2 , with a velocity 5 m/s vertically up w.r.t himself. Taking the masses of blocks and man as 60 kg each and assuming that the man never slips on m_2 , find (a) The time at which man throws the ball and (b) The coordinates of the point where ball lands. Neglect the dimensions of the system. (g = 10 m/s^2 )

$The system is initially at origin and is$ $moving with a velocity (3 m / s) \overset{\land}{k} . A$ $force (120 t newton) \overset{\land}{i} acts on mass m_{2},$ $where t is time in seconds .$ $The man throws a light ball, at the$ $instant when m_{1} starts slipping on m_{2},$ $with a velocity 5 m / s vertically up w . r . t$ $himself . Taking the masses of blocks$ $and man as 60 kg each and assuming$ $that the man never slips on m_{2}, find$ $(a) The time at which man throws the$ $ball and$ $(b) The coordinates of the point where$ $ball lands . Neglect the dimensions of$ $the system . (g = 10 m / s^{2})$

Question Number 22518 Answers: 2 Comments: 1

Question Number 22499 Answers: 1 Comments: 1

A cylinder of weight 200 N is supported on a smooth horizontal plane by a light cord AC and pulled with force of 400 N. The normal reaction at B is equal to

$A cylinder of weight 200 N is supported$ $on a smooth horizontal plane by a light$ $cord A C and pulled with force of 400 N .$ $The normal reaction at B is equal to$

Question Number 22492 Answers: 1 Comments: 1

A ball of mass 400 g travels horizontally along the ground and collides with a wall. The velocity-time graph below represents the motion of the ball for the first 1.2 seconds. The magnitude of average force between the ball and the wall is

$A ball of mass 400 g travels horizontally$ $along the ground and collides with a$ $wall . The velocity - time graph below$ $represents the motion of the ball for the$ $first 1.2 seconds .$ $The magnitude of average force between$ $the ball and the wall is$

Question Number 22487 Answers: 1 Comments: 1

Question Number 22481 Answers: 1 Comments: 1

Question Number 22479 Answers: 0 Comments: 2

A ladder of mass m is leaning against a wall. It is in static equilibrium making an angle θ with the horizontal floor. The coefficient of friction between the wall and the ladder is μ_1 and that between the floor and the ladder is μ_2 . The normal reaction of the wall on the ladder is N_1 and that of the floor is N_2 . If the ladder is about to slip, then (1) μ_1 = 0, μ_2 ≠ 0 and N_2 tan θ = mg/2 (2) μ_1 ≠ 0, μ_2 = 0 and N_1 tan θ = mg/2 (3) μ_1 ≠ 0, μ_2 ≠ 0 and N_2 = ((mg)/(1 + μ_1 μ_2 )) (4) μ_1 = 0, μ_2 ≠ 0 and N_1 tan θ = ((mg)/2)

$A ladder of mass m is leaning against a$ $wall . It is in static equilibrium making$ $an angle θ with the horizontal floor .$ $The coefficient of friction between the$ $wall and the ladder is μ_{1} and that$ $between the floor and the ladder is μ_{2} .$ $The normal reaction of the wall on the$ $ladder is N_{1} and that of the floor is N_{2} .$ $If the ladder is about to slip, then$ $(1) μ_{1} = 0, μ_{2} \neq 0 and N_{2} \tan θ = m g / 2$ $(2) μ_{1} \neq 0, μ_{2} = 0 and N_{1} \tan θ = m g / 2$ $(3) μ_{1} \neq 0, μ_{2} \neq 0 and N_{2} = \frac{m g}{1 + μ_{1} μ_{2}}$ $(4) μ_{1} = 0, μ_{2} \neq 0 and N_{1} \tan θ = \frac{m g}{2}$

Question Number 22696 Answers: 1 Comments: 5

A force F^→ = 2xj^∧ newton acts in a region where a particle moves anticlockwise in a square loop of 2 m in x-y plane. Calculate the total amount of work done. Is this force a conservative force or a non-conservative force?

$A force \vec{F} = 2 x \overset{\land}{j} newton acts in a region$ $where a particle moves anticlockwise$ $in a square loop of 2 m in x - y plane .$ $Calculate the total amount of work$ $done . Is this force a conservative force$ $or a non - conservative force ?$

Question Number 22473 Answers: 0 Comments: 1

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