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Questions asked by sharmaaparna1
Questions
282
questions
0
answers selected
In an alpha scattering experiment, few alpha particles rebounded because
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
Which of the following ions will have maximum magnetic moment
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
Find Atomic number of element that has electron configuration lasting with $6p^2$
sat
chemistry
atomic-structure
asked
Jul 17, 2018
1
answer
What is the hybridisation of central metal ion and shape of Wilkinson’s catalyst ?
class12
cbse
chemistry
coordinate-compounds
ch-9
sec-a
asked
Jan 30, 2017
1
answer
(i) Halogen acids (HX) readily combine with alkenes to form addition products but fail to react with carbonyl compounds. Explain (ii) Why HCOOH does not give HVZ reaction but $CH_3COOH$ does?
cbse
class12
chemistry
sec-c
aldehydes-ketones-and-carboxylic-acids
asked
Dec 29, 2016
1
answer
Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved.
cbse
class12
chemistry
ch-13
sec-c
amines
asked
Dec 29, 2016
1
answer
How will you convert: (i) Ethanoic acid into methanamine (ii) Hexanenitrile into 1-aminopentane (iii) Methanol to ethanoic acid
cbse
class12
chemistry
ch-13
amines
sec-c
asked
Dec 29, 2016
1
answer
(a) What does it mean for a molecule or a ligand to be "chiral"? What properties does chirality impart to a molecule? (b)What is the difference between a heterogeneous and a homogeneous catalyst? What are some of the advantages of homogeneous catalysts?
cbse
class12
chemistry
ch-15
sec-c
polymers
asked
Dec 29, 2016
1
answer
(a) How is granular zinc & zinc dust obtained ? (b) Explain why thermit process is quite useful for repairing the broken parts of a machine ?
cbse
class12
chemistry
ch6
sec-c
isolation-of-elements
asked
Dec 29, 2016
1
answer
(a) The actinoids exhibit more number of oxidation states and give their common oxidation states. (b)A wellknown orange crystalline compound (A) when burnt impart violet colour to flame. (A) on treating (B) and conc. $H_2SO_4$ gives red gas (C) which gives red yellow solution (D) with alkaline water. (D) on treating with acetic acid and lead acetate gives yellow p. pt. (E). (B) sublimes on heating. Also on heating (B) with NaOH gas (F) is formed which gives white fumes with HCl. What are (A) to (F) ?
cbse
class12
chemistry
sec-e
ch-8
d-and-f-block-elements
asked
Dec 29, 2016
1
answer
Consider the electrochemical cell :$Zn (s) / Zn^{2+} (aq) // Cu^{2+} (aq) / Cu.$ It has an electrical potential of 1.1 V when concentration of $Zn^{2+}$ and $Cu^{2+}$ ions is unity.State the direction of flow of electrones and also specify if Zinc and Copper aredeposited or dissolved at their respective electrodes. When :(a) an external opposite potential of 0.8 V is applied.(b) an external opposite potential of 1.1 V is applied.(c) an external opposite potential of 1.4 V is applied.
cbse
class12
chemistry
sec-c
ch-3
electrochemistry
asked
Dec 29, 2016
1
answer
(i) In a cell reaction, the equilibrium constant K is less than one. Is E° for the cell positive or negative ? (ii) What will be the value of K of $E^{\circ}$ cell = 0 ?
cbse
class12
chemistry
ch3
sec-b
electrochemistry
asked
Dec 29, 2016
1
answer
How much ethyl alcohol must be added to 1 litre of water so that the solution will freeze at $14^{\circ}F$ ? ($K_f$ for water = $1.86^{\circ}C/mol)$
cbse
class12
chemistry
ch2
solutions
sec-c
asked
Dec 29, 2016
1
answer
Out of (a) 200 ml of 2 M NaCl Soln and (b) 200 ml of 1 M glucose Soln. which one has higher osmotic pressure ?
cbse
class12
chemistry
ch2
sec-b
solutions
asked
Dec 29, 2016
1
answer
A metal crystallises into two cubic phases , face-centered cubic (fcc) and body centered (bcc) whose unit lengths are $3.5 \;and\;3.0 A^{\large\circ}$ respectively . Calculate the ratio of densities of fcc and bcc.
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
difficult
asked
Apr 9, 2014
1
answer
Cu metal crystallises in face centered cubic lattice with cell edge , a = 361.6 pm . What is the density of Cu crystal ? (Atomic mass of copper = 63.5 amu , $N_A = 6.023\times10^{23}$
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
difficult
asked
Apr 9, 2014
1
answer
The density of crystalline sodium chloride is $2.165g cm^{-3}$ . What is the edge length of the unit cell.
sat
chemistry
liquids-solids-and-phase-change
jeemain
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
asked
Apr 9, 2014
1
answer
Silver crystallises in a face centered cubic unit cell . The density of Ag is $10.5 g cm^{-3}$. Calculate the edge length of the unit cell .
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
asked
Apr 8, 2014
1
answer
What is the pressure of HCl gas at $-40^{\large\circ}C$ if its density is $8.0 kgm^{-3}? (R = 8.314 JK^{-1}mol^{-1})$
sat
chemistry
liquids-solids-and-phase-change
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q196
asked
Apr 8, 2014
1
answer
A sample of gas occupies a volume of 512 mL at $20^{\large\circ}C$ and 74 cm of Hg as pressure . What volume would this gas occupy at STP?
jeemain
chemistry
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q195
asked
Apr 8, 2014
1
answer
Helium and Argon are monoatomic gases and their atomic weights are 4 and 40 respectively . Under identical conditions, helium will diffuse through a semipermeable membrane
jeemain
chemistry
states-of-matter
unit5
class11
difficult
kinetic-molecular-theory-of-gases
q194
asked
Apr 8, 2014
1
answer
2g of hydrogen diffuses from a container in 10 minutes . How many grams of oxygen would diffuse through the same container in the same time under similiar conditions ?
jeemain
chemistry
states-of-matter
unit5
class11
difficult
liquifaction-of-gases
q193
asked
Apr 8, 2014
1
answer
The time taken for a certain volume of a gas X to diffuse through a small hole is 2 minutes . It takes 5.65 minutes for oxygen to diffuse under the similiar conditions . The molecular weight of X is
jeemain
chemistry
states-of-matter
unit5
class11
difficult
kinetic-molecular-theory-of-gases
q192
asked
Apr 8, 2014
1
answer
If same moles of $O_2$ diffuse in 18 sec and same mole of other gas diffuse in 45 sec then what is the molecular weight of the unknown gas?
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q191
asked
Apr 8, 2014
1
answer
The density of a pure substance 'A' whose atoms pack in cubic close pack arrangement is 1g m/cc . If B atoms can occupy tetrahedral voids and all the tetrahedral voids are occupied by 'B' atoms what is the density of resulting solid in gm/cc . [Atomic mass (A) = 30 gm/mol and atomic mass (B) = 50gm/mol]
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
asked
Apr 7, 2014
1
answer
The root mean square of a gas at 300K is $3\sqrt{R}$. The molar mass of this gas in $Kg mol^{-1}$ is
jeemain
chemistry
states-of-matter
unit5
kinetic-molecular-theory-of-gases
class11
difficult
q189
asked
Apr 7, 2014
1
answer
The $U_{rms}$ of $SO_2 \;at\;27^{\large\circ}C$
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q188
asked
Apr 7, 2014
1
answer
The average kinetic energy of 1.6 g $CH_4$ molecules at $27^{\large\circ}C$ is:
sat
chemistry
liquids-solids-and-phase-change
jeemain
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q187
asked
Apr 7, 2014
1
answer
The intermolecular forces vanishes among water molecules , then volume occupied by 1.8 g $H_2O(l)$ at STP is
jeemain
chemistry
states-of-matter
intermolecular-forces-and-thermal-energy
unit5
class11
difficult
q186
asked
Apr 7, 2014
1
answer
The intercept of plots of log V vs log T curves at constant pressure P for 1 mole gas will be
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q185
asked
Apr 7, 2014
1
answer
For one mole of an ideal gas $(\large\frac{\delta P}{\delta T})_V.(\large\frac{\delta V}{\delta T})_P . (\large\frac{\delta V}{\delta T})_T $ is equal to ....
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q184
asked
Apr 7, 2014
1
answer
The kinetic molecular theory attributes an average translational kinetic energy of $\large\frac{3}{2}\large\frac{RT}{N}$ to each particle. What rms speed woul a mist particle of mass $10^{-12}g$ have a root temperature $(27^{\large\circ}C)$ according to kinetic theory of gases.
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q183
asked
Apr 7, 2014
1
answer
The composition of the equilibrium mixture $(Cl_2\iff2Cl)$ which is attained at $1200^{\large\circ}C$ is determined by measuring the rate of effusion through a pinhole . It is observed that at 1.80 mm Hg pressure , the mixture effuses 1.16 times as fast as krypton effuses under the same conditions. Calculate the fraction of chlorine molecules dissociated anto atoms.(Atomic wt of Kr = 84)
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q182
asked
Apr 5, 2014
1
answer
Pure $O_2$ diffuses through an aperture in 224 seconds whereas mixture of $O_2$ and another gas containing $80\%\;O_2$ diffuses from the same in 234 sec. What is mol. wt. of gas?
jeemain
chemistry
states-of-matter
liquifaction-of-gases
unit5
class11
difficult
q181
asked
Apr 5, 2014
1
answer
The average speed at $T_1K$ and the most probable speed at $T_2K of $CO_2$ gas is $9\times10^4cm/s. Calculate the value of $T_1 and T_2$
jeemain
chemistry
states-of-matter
unit5
class11
kinetic-molecular-theory-of-gases
difficult
q180
asked
Apr 5, 2014
1
answer
The density of a mixture of $O_2$ and $N_2$ at NTP is 1.3g/l . Calculate partial pressure of $O_2$ .
jeemain
chemistry
states-of-matter
unit5
class11
ideal-gas-equation
difficult
q179
asked
Apr 5, 2014
1
answer
The pressure exerted by 12g of an ideal gas at temperature $t^{\large\circ}C$ in a vessel of volume V litre is one atm. when the temperature is increased by 10 degree at the same volume , the pressure increases by $10\%$. Calculate the temperature t and volume V (molecular weight of the gas = 120 )
jeemain
chemistry
states-of-matter
unit5
class11
ideal-gas-equation
difficult
q178
asked
Apr 4, 2014
1
answer
A gas filled freely collapsible balloon is pushed from the surface level of lake to a depth of 100 metre . Calculate what per cent of its original volume , the balloon finally have ? Assume ideal gas nature .
jeemain
chemistry
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q177
asked
Apr 3, 2014
1
answer
Equal weights of $CH_4$ and $O_2$ are mixed in an empty container of one litre at $27^{\large\circ}C$. Calculate the fraction of total pressure exerted by $O_2$.
jeemain
chemistry
states-of-matter
unit5
class11
kinetic-molecular-theory-of-gases
difficult
q176
asked
Apr 3, 2014
1
answer
An open flask contains air at $27^{\large\circ}C$. Calculate temperature at which it should be heated so that , $\large\frac{1}{3}rd$ of air measured at $27^{\large\circ}C$ escapes out.
jeemain
chemistry
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q175
asked
Apr 3, 2014
1
answer
A flask is of a capacity of one litre . What volume of air will escape from the flask if it is heated from $27^{\large\circ}C$ to $37^{\large\circ}C$? Assume pressure as constant.
jeemain
chemistry
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q174
asked
Apr 3, 2014
1
answer
0.553 g of a boron - hydrogen compound created a pressure of 0.658 atm in a bulb of 407 mL at $100^{\large\circ}C$. Analysis showed it to $85.7\%$ boron . Calculate its molecular formula.
jeemain
chemistry
states-of-matter
unit5
ideal-gas-equation
class11
difficult
q173
asked
Apr 3, 2014
1
answer
What would be the final pressure of $O_2$ in following experiment ? A collapsed polyethylene bag of 30 litre capacity is partially blown up by the addition of 10 litre of $N_2$ at 0.965 atm at 298K . Subsequently enough $O_2$ is pumped into bag so that at 298K and external pressure of 0.990 atm, the bag contains full 30 litre.
jeemain
chemistry
states-of-matter
unit5
ideal-gas-equation
class11
difficult
q172
asked
Apr 3, 2014
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.
jeemain
chemistry
states-of-matter
unit5
kinetic-molecular-theory-of-gases
class11
difficult
q171
asked
Apr 2, 2014
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 .
jeemain
chemistry
states-of-matter
unit5
gas-laws
class11
q170
asked
Apr 2, 2014
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.
jeemain
chemistry
states-of-matter
unit5
ideal-gas-equation
class11
difficult
q169
asked
Apr 2, 2014
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 $b = 0.031\;litre\;mol^{-1}$
jeemain
chemistry
states-of-matter
unit5
ideal-gas-equation
class11
difficult
q168
asked
Apr 2, 2014
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 $mol^{-1}$
jeemain
chemistry
states-of-matter
class11
ideal-gas-equation
unit5
difficult
q167
asked
Apr 2, 2014
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.
jeemain
chemistry
states-of-matter
unit5
liquifaction-of-gases
class11
difficult
q166
asked
Apr 1, 2014
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 $kgm^{-3}$ . [$R = 0.082dm^3\;atm\; K^{-1}\;mol^{-1}$]
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q165
asked
Apr 1, 2014
1
answer
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