Recent questions and answers in Chemistry

Recent questions and answers in Chemistry

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

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

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For the cell (at $298 \mathrm{~K}$ ) $\mathrm{Ag}(\mathrm{s})|\mathrm{AgCl}(\mathrm{s})| \mathrm{Cl}^{-}(\mathrm{aq}) \| \mathrm{AgNO}_{3}$ (aq) $\mid \mathrm{Ag}(\mathrm{s})$

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${A}$ cell ${Ag}\left|{Ag}^{+}\right|\left|{Cu}^{++}\right| {Cu}$ initially contains $2 {M} {Ag}^{+}$and $2 {M} {Cu}^{++}$ions. The change in cell potential after the passage of $10 {amp}$ current for $4825 {sec}$ is :

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Calculate the cell EMF in $m V$ for ${Pt}\left|{H}_{2}(1 {atm})\right| {HCl}(0.01 {M})|{AgCl}({s})| {Ag}({s})$ at $298 {K}$ if $\Delta G^{\circ}$ values are at $25^{\circ} {C}$

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The standard reduction potential of a $\mathrm{AgCl} / \mathrm{Ag}$ electrode is $0.2 \mathrm{~V}$ and that of a silver electrode $(\mathrm{Ag} / \mathrm{Ag})$ is $0.79 \mathrm{~V}$.

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Cu-63 isotope is $69.09 \%$ and $C u-65,30.91 \%$ in a copper atom.

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$1.5276 g$ of $CdCl _{2}$ was found to contain $0.9367 g$ of cadmium. Calculate the atomic weight of cadmium.

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A piece of a metal weighs between $0.5 g$ and $0.6 g$. When dissolved in dilute $H _{2} SO _{4}, 196 mL$ of

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3.7 $g$ of an oxide of a metal was heated with charcoal. The liberated $CO _{2}$ was absorbed in caustic soda solution and weighed $1.0 g$

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$1.0 g$ of a metallic carbonate left on ignition $0.56 g$ of its oxide. What is the atomic weight of the metal?

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$1.878 g$ of a metal bromide when heated in a stream of hydrogen chloride gas is completely converted to the chloride weighing $1 \cdot 00 g$.

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A hydrated sulphate of a metal contained $8.1 \%$ metal and $43 \cdot 2 \%$ sulphate by weight.

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The vapour density of a chloride of a metal is $81 \cdot 5(H=1)$ and the chloride contains $34.46 \%$ metal. The specific heat of the metal is $0 \cdot 115$.

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The chloride of a metal $M$ is to contain $20 \cdot 2 \%$ metal. The specific heat of the metal is $0 \cdot 224$.

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It was found that $100 g$ of silver combined with all the chlorine in $56 \cdot 0$ $g$ of arsenious chloride.

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$0.4686 g$ of a metal oxide yields on reduction $0.3486 g$ of the metal

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Potassium sulphate is isomorphous with potassium chromate which contains $26.79 \%$ by weight of chromium.

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$Cu _{2} S$ and $Ag _{2} S$ are isomorphous compounds. The percentage of sulphur in $Cu _{2} S$ is $20 \cdot 14$ and that in $Ag _{2} S$ is 12.94.

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The oxides of two metals $X$ and $Y$ are isomorphous. The metal $X$ whose atomic weight is 52 forms a chloride whose vapour density is 79.

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The specific heat of a metal is $0 \cdot 16$. Its approximate atomic weight would be :

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$1.0 g$ of hydrogen is heated to combine with $80.0 g$ of bromine and $1.0 g$ of calcium (valency $=2$ ) combines with $4.0 g$ of bromine.

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The element $X$ is trivalent. $9 \cdot 0 g$ of the element combines with $8.0 g$ of oxygen. The atomic weight of $X$ is, therefore :

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The increasing order (lower first) for the value of $e / m$ (charge/mass) for electron $(e)$

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