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Questions >> JEEMAIN and NEET >> Chemistry

Chemistry

Hybridisation is defined as the phenomenon of mixing of orbitals of nearly the same energy so as to redistribute their energies and to give rise to new orbitals of equivalent energy. It is the valence shell atomic which get hybridised one of the electrons from an orbital in the ground state electronic configuration of the atom gets promoted to the next available orbital of higher energy resulting in an excited state electronic configuration with the appropriate number of half filled orbitals. The orbitale in the excited state undergo hybridisation giving hybrid orbilats of equivalent energy. Hybrid orbitals generally from either bonds or contain lone pair of electrons, they do not form $\pi$ bonds. Depending on the type of orbitals used the hybridisation may be categorized as $SP$(linear), $SP^2$ (trigonal planar ), $SP^3$(tetrahedral), $SP^3d$(trigonal bipyramidal), $SP^3d^2$(Octahedral), $SP^3d^3$ (Pentagonal bipyramid ). Which one of the following species is diamagnetic ?

asked Apr 3, 2014 by meena.p

1 answer

Hydrogen bonding is an electrostatic attraction between covalently bonded hydrogen atom of one molecular with highly electronegative atom (N or F or O) of the same molecular or another molecule. or another molecular .It is of two types -(i) Intermolecular hydrogen bonding where molecular association is caused due to interaction of $H-atom$ of one molecular and N or F or 0-atoms of different molecules. (ii) Intramolecular hydrogen bonding where hydrogen bonding occurs between H atom and N or F or O-atom of the same molecule. Intermolecular hydrogen bonding increases the boiling point of the compound and its solubility in water , whereas intramolecular hydrogen bonding decreases the boiling point of the compound and solubility in water. Which one among the following does not have the hydrogen bond?

asked Apr 2, 2014 by meena.p

1 answer

Hydrogen bonding is an electrostatic attraction between covalently bonded hydrogen atom of one molecular with highly electronegative atom (N or F or O) of the same molecular or another molecule. or another molecular .It is of two types -(i) Intermolecular hydrogen bonding where molecular association is caused due to interaction of $H-atom$ of one molecular and N or F or 0-atoms of different molecules. (ii) Intramolecular hydrogen bonding where hydrogen bonding occurs between H atom and N or F or O-atom of the same molecule. Intermolecular hydrogen bonding increases the boiling point of the compound and its solubility in water , whereas intramolecular hydrogen bonding decreases the boiling point of the compound and solubility in water.Highest viscosity is exhibited by

asked Apr 2, 2014 by meena.p

1 answer

Hydrogen bonding is an electrostatic attraction between covalently bonded hydrogen atom of one molecular with highly electronegative atom (N or F or O) of the same molecular or another molecule. or another molecular .It is of two types -(i) Intermolecular hydrogen bonding where molecular association is caused due to interaction of $H-atom$ of one molecular and N or F or 0-atoms of different molecules. (ii) Intramolecular hydrogen bonding where hydrogen bonding occurs between H atom and N or F or O-atom of the same molecule. Intermolecular hydrogen bonding increases the boiling point of the compound and its solubility in water , whereas intramolecular hydrogen bonding decreases the boiling point of the compound and solubility in water. The maximum possible number of hydrogen bonds in which a water molecule can participate is

asked Apr 2, 2014 by meena.p

1 answer

Hydrogen bonding is an electrostatic attraction between covalently bonded hydrogen atom of one molecular with highly electronegative atom (N or F or O) of the same molecular or another molecule. or another molecular .It is of two types -(i) Intermolecular hydrogen bonding where molecular association is caused due to interaction of $H-atom$ of one molecular and N or F or 0-atoms of different molecules. (ii) Intramolecular hydrogen bonding where hydrogen bonding occurs between H atom and N or F or O-atom of the same molecule. Intermolecular hydrogen bonding increases the boiling point of the compound and its solubility in water , whereas intramolecular hydrogen bonding decreases the boiling point of the compound and solubility in water. The hydrogen bond is strongest in

asked Apr 2, 2014 by meena.p

1 answer

The species which contain an odd number of valence electrons and are paramagnetic are

asked Apr 2, 2014 by meena.p

1 answer

Intramolecular hydrogen bonds occur is (i) 2- chlorophenol (ii) Salicylic acid (iii) para nitrophenol (iv) none of these

asked Apr 2, 2014 by meena.p

1 answer

Which of the following species contain covalent coordinate bonds? $(i)\; AlCl_3 \\ (ii)\;CO \\ (iii)\;[Fe(CN)_6]^{4-} \\ (iv)\; NO_3^{-}$

asked Apr 2, 2014 by meena.p

1 answer

Which of the following have identical bond order? $(i)\; CN^{-} \\ (ii)\;NO_2^{-} \\ (iii)\;NO^{+} \\ (iv)\; CN^{+}$

asked Apr 2, 2014 by meena.p

1 answer

Which of the following conditions apply to resonating structures? (i) Identical arrangements of atoms (ii) Nearly same energy content (iii) Identical number of bonds (iv) Same number of unpaired electrons

asked Apr 2, 2014 by meena.p

1 answer

Which of the following are diamagnetics ? $(i)\;C_2 \\ (ii)\;He_2 \\(iii)\;Li_2 \\(iv)\;N_2 $

asked Apr 2, 2014 by meena.p

1 answer

In which of the following the hybrid orbitals of the central atom have the same s-characters ? $(i)\;CH_4 \qquad (ii)\; Ni(CO) \qquad (iii)\;SF_4 \qquad (iv) [Ni(CN)_4]^{2-} $

asked Apr 2, 2014 by meena.p

1 answer

The mean kinetic energy of a molecule at $0^{\large\circ}C$ is $5.62\times10^{-14} erg$ . Calculate Boltzmann's Constant . If the value of $R = 8.314\times10^7 erg$ . and also calculate the no. of molecules present in one mole of gas.

asked Apr 2, 2014 by sharmaaparna1

1 answer

Consider the reaction ,$2A +B \to products$ when concentration of B alone was doubled , the half -life did not change . When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is :

asked Apr 2, 2014 by meena.p

1 answer

Two flasks A and B have equal volumes. Flask A contains $H_2$ at $27^{\large\circ}C$ while B contains equal mass of $C_2H_6$ at $627^{\large\circ}C$. In which flask and by how many times are molecules moving faster ? Assume ideal gas nature for both .

asked Apr 2, 2014 by sharmaaparna1

1 answer

The time for half life period of a certain reaction. A - products is 1 hour when initial concentration of the reactant A is $2.0\; mol\; L^{-1}$, how much time does it take for its concentration to come from $0.50$ to $ 0.25\;mol L^{-1}$ if it is a zero order reaction ?

asked Apr 2, 2014 by meena.p

1 answer

The critical constant for water are $374^{\large\circ}C$ 218 atm and 0.0566 litre $mol^{-1}$. Calculate a , b and R.

asked Apr 2, 2014 by sharmaaparna1

1 answer

In the following first order reactions : $A+ Regent \quad \underrightarrow{K_1} \quad product; \qquad B+ Reagent \quad \underrightarrow {K_2} \quad Product$ The ratio of $\large\frac{K_1}{K_2}$ when only $50 \%$ of B reacts in a given time when $94 \%$ of a has been reacted is :

asked Apr 2, 2014 by meena.p

1 answer

Calculate the temperature of gas if it obeys Van der Waals equation from the following data. A flask of 25 litre contains 10 mole of a gas under 50 atm . Given $a = 5.46\; atm \;litre^2mol^{-2}$ and $b = 0.031\;litre\;mol^{-1}$

asked Apr 2, 2014 by sharmaaparna1

1 answer

The $ONO$ bond angle is maximum in

asked Apr 2, 2014 by meena.p

1 answer

Using Van der Waals's equation . Calculate the constant 'a' when two mole of a gas confined in a four litre flask exerts a pressure of 11.0 atmospheres at a temperature of 300K . The value of b is 0.05 lit $mol^{-1}$

asked Apr 2, 2014 by sharmaaparna1

1 answer

Which of the following are isoelectronic and isostructural ? $NO_3^{-},CO_3^{2-},ClO_3^{-}, SO_3$

asked Apr 2, 2014 by meena.p

1 answer

Which is most viscous?

asked Apr 2, 2014 by meena.p

1 answer

The electronegativities of $F,Cl,Br$ and $I$ are $4.0,3.0,2.8$ and $2.5$ respectively. Hydrogen halide with a high percentage of ionic character is

asked Apr 2, 2014 by meena.p

1 answer

$N_2$ forms $Ncl_3$ whereas P can form both $Pcl_3$ and $PCl_5$ why ?

asked Apr 2, 2014 by meena.p

1 answer

In III A group ,Tl (Thalium) shows stable +1 oxidation state, while boron shows stable +3 oxidation state. It is due to

asked Apr 2, 2014 by meena.p

1 answer

Which one of the following oxides is expected to exhibit paramagnetic behaviour ?

asked Apr 2, 2014 by meena.p

1 answer

Which of the species is diamagnetic ?

asked Apr 2, 2014 by meena.p

1 answer

Correct order of bond length is

asked Apr 1, 2014 by meena.p

1 answer

The statement true for $N_3 ^{-}$ is :

asked Apr 1, 2014 by meena.p

1 answer

In piperidine N-atom has hybridisation

asked Apr 1, 2014 by meena.p

1 answer

Correct order of dipole moment for the following molecules is

asked Apr 1, 2014 by meena.p

1 answer

Among the following compounds the one that is polar and has the central atom with $SP^2$ hybridisation is :

asked Apr 1, 2014 by meena.p

1 answer

The cyanide ion, $CN^{-}$ and $N_2$ are isoelectronic . But in contrast to $CN^{-},N_2$ is chemically inert, because of

asked Apr 1, 2014 by meena.p

1 answer

During the formation of a molecular orbital from atomic orbitals , the electron density is

asked Apr 1, 2014 by meena.p

1 answer

Which of the following molecular is the most polar?

asked Apr 1, 2014 by meena.p

1 answer

Arrange the following compounds in order of increasing dipole moment? (I) Toluene (II) m-dichlorobenzene (III) o-dichlorobenzene (IV) P-dichlorobenzene

asked Apr 1, 2014 by meena.p

1 answer

The hybridisation of atomic orbitals of nitrogen in $NO_2^{+},NO_3^{-}$ and $NH_4^{+}$ are

asked Apr 1, 2014 by meena.p

1 answer

Which of the following arrangement of molecules is correct on the basis of their dipole moments?

asked Apr 1, 2014 by meena.p

1 answer

$0.5\;g$ of fluming $H_2SO_4$(oleum) is diluted with water. This solution is completely neutralised by $26.7\;mL$ of $0.4\;N\;NaOH$. The percentage of free $SO_3$ in the sample is

asked Apr 1, 2014 by meena.p

1 answer

$0.005\;cm$ thick coating of silver is deposited on a plate of $0.5 \;m^2$ area. The number of silver atoms deposited on the plate are (atomic mass of silver $=108$ , and its density $=7.9g cm^{-3}$

asked Apr 1, 2014 by meena.p

1 answer

A jar contains a gas and a few drops of water at 'T' K . The pressure in the jar is 830mm of Hg. The temperature of the jar is reduced by $1\%$. The vapour pressure of water at two temperature are 30 and 25 mm of Hg. Calculate the new pressure in the jar.

asked Apr 1, 2014 by sharmaaparna1

1 answer

Four one litre flasks are separately filled with the gases hydrogen, helium , oxygen and ozone at the same room temperature and pressure. The ratio of total number of atoms of these gases present in the different flasks would be

asked Apr 1, 2014 by meena.p

1 answer

A balloon of diameter 20 metre weighs 100kg . Calculate its pay-load if it is filled with He at 1.0atm and $27^{\large\circ}C$ . Density of air is 1.2 $kgm^{-3}$ . [$R = 0.082dm^3\;atm\; K^{-1}\;mol^{-1}$]

asked Apr 1, 2014 by sharmaaparna1

1 answer

The density of salt solution is $1.13\;g\;cm^{-3}$ at $298\;k$. The solution contains $17.0 \%$ sodium chloride . What volume of solution will contain $38.42 \;g$ of $NaCl$?

asked Apr 1, 2014 by meena.p

1 answer

Haemoglobin contains $0.33 \%$ of irons by weight. The molecular weight of haemoglobion is approximately $67200$. The number of iron atoms (at wt of $Fe=56$) present in one molecule of haemolgobin is

asked Apr 1, 2014 by meena.p

1 answer

A hydrocarbon contains $85.7 \%C$ If $42\;mg$ of the compound contains $3.01 \times 10^{20}$ molecules, the molecular formula of the compound is

asked Apr 1, 2014 by meena.p

1 answer

How many g of KCl would have to be dissolved in $60\;g\; H_2O$ to give $20\%$ by weight of solution ?

asked Apr 1, 2014 by meena.p

1 answer

$1.12\;mL$ of a gas is produced at STP by the action of $4.12\;mg$ of alcohol ROH with methyl magnesium iodide. The molecular mass of alcohol is

asked Apr 1, 2014 by meena.p

1 answer

The hydrolysis product of lactose are

asked Mar 31, 2014 by thanvigandhi_1

1 answer

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