Latest Question and Answer

Latest Question and Answer

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Any number divided by zero, the quotient is —

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Any number multiplied by 1, the product is —

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Any number divided by 1, the quotient is —

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Every number is more than the previous number on the —

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The smallest whole number is —

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Whether $ClO_2^{-}$ ion is linear or not? Explain

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Why axial bonds of $PCl_5$ are longer than equatorial bonds?

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$BH_4^{-}$ and $NH_4^{+}$ are isostructural. Explain.

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Out of p-orbital and sp-hybrid orbital which has greater directional character and why?

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On the basis of molecular orbital theory what are the similarities between

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How bond energy varies from $N_2^{-}$ to $N_2^{+}$ and why?

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Among the elements of the second period Li to Ne pick out the element :

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The covalent radius of an atom is smaller than the metallic radius of the atom. Explain why?

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$BF_3$ and graphite both are coplanar having $sp^2$ hybridisation but later is a good conductor. Explain.

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Whether $PCl_3$ molecule is polar or non-polar? Explain

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Whether the geometry of $XeF_2$ is linear or non-linear? Explain.

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Define hydrogen bond. Also explain the conditions required for H-bonding and the types of it with example. Is it weaker or stronger than the van der Waals forces?

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Ashish always tried to understand the theoretical concepts learnt in his class better by performing the experiment in laboratory, whenever possible.

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Discuss the shapes of the following molecules on the basis of valence bond theory: $BeF_2$ and $CH_4$.

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By what name are the elements belonging to the f-block called?

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All transition elements are d-block elements, but all d-block elements are not transition elements. Explain.

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Illustrate by taking examples of transition elements and non-transition elements that oxidation states of elements are largely based on electronic configuration.

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Which would you expect to be larger, the first ionisation enthalpy of Rb or Sr and Cl or Br? Explain why.

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What is the significance of the large increase in the third ionisation enthalpy of Ca and the fifth ionisation enthalpy of Si?

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Explain why the substantial decrease in first ionisation enthalpy is observed between Na and K, and Mg and Ca, is not observed between Al and Ga.

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Why H₂O is a liquid while H₂S is a gas?

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Write the significance of a plus and a minus sign shown in representing the orbitals.

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Account for the following —

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Why is the concept of resonance needed? What is a resonance hybrid? How does it differ from the resonance structures drawn for a molecule?

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Which out of the two molecules OCS and $CS_2$ has a higher dipole moment and why?

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Explain how valence bond theory differs from the Lewis concept

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Two cars are moving towards each other on a straight road with velocity $10 {m} / {sec}$ and $12 {m} / {sec}$ respectively.

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In the above question at what prior distance from the first point the scooter was at rest.

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A scooter moving with constant acceleration covers the distance between two points in $6 {sec}$. Its speed when it passes the second point, is $15 {m} / {sec}$. what will be its velocity when it passes from first point, if the distance between the two points is 60 metre.

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In the above question state whether the body is moving with uniform velocity or uniform acceleration.

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If the displacement $y$ of a particle is proportional to $t^2$, that is, if $y \propto t^2$, then what is the initial velocity of the particle?

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If the displacement $y$ of a particle is proportional to time, that is, if $y \propto t$, then the acceleration of the particle will be

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If the distance $y$ of a particle at a time $t$ along a straight line is given by

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A particle starting from rest experiences a constant acceleration for 20 seconds. If it travels a distance $y_1$ in the first $10 {sec}$ and a distance $y_2$ in the next $10 {sec}$. then obtain a relation between $y_1$ and $y_2$.

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A body travels $200 {cm}$. in the first $2 {sec}$, and $220 {cm}$ in the next $4 {sec}$. What will be the velocity at the end of the seventh second from the start?

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An electron which is moving with a velocity of $5 \times 10^6 {m} / {sec}$ emerges from a sheet of paper of thickness $2.1 \times 10^{-4} {~cm}$. with a velocity of $2 \times 10^6 {~m} / {sec}$. Calculate the time taken by the electron to pass through the sheet of the paper.

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In the above question calculate the total distance travelled when it comes to rest.

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In the above question, calculate the time in which it will come to rest.

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At a given instant, the speed of a scooter is $54 {km} / {h}$ and after $10 {sec}$. it becomes $18 {~km} / {h}$; calculate its acceleration, assuming it to be constant.

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In the above question, calculate the distance travelled in this time.

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A car accelerates from rest to a speed of $100 {m} / {sec}$ in $25 {sec}$. Calculate its acceleration.

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In the above question calculate the acceleration of the train.

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The speed of a train changes from $36 {km} / {h}$ to $72 {~km} / {h}$ in $10 {sec}$. Calculate the distance travelled during this time.

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A man moves from a place $P$ to $Q$ with a constant speed of $40 {m} / {sec}$., and then he returns back to $P$ along the same route with a Speed of $20 {m} / {sec}$. then calculate the average speed of the man.

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A man moves from a place $P$ to another place $Q$ with a constant speed of $10 {m} / {sec}$. and then he returns back to $P$ again with the same constant speed along the same route. Calculate the average speed of the man.

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