The oxidation number of Sulphur in S6, S2F2 and H2S respectively are —

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Aayush Asked Feb 2

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A, B and C elements have the oxidation number of +6, -2 and -1 respectively. The possible molecular formula when these atoms combine can be —

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Shakti Asked Dec 20, 2021

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Sulphur exist in different allotropic forms like S2, S6 and S8 etc. If equal moles of these three forms are taken in separate containers, then the ratio of number of atoms present in them respectively is

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Aayush Asked Feb 1

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Calculate individual and average oxidation number (if required) of the marked element of the following compounds.

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Oxidation number of Chlorine can be —

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Aayush Asked Jan 31

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A sample of oxygen containing 4/Ν_Α mol of oxygen is represented on a Y-map where its volume at NTP, mass of the sample and number of particles are shown. Study the map & choose the correct option.

Aayush Asked Jan 31

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Shakti Asked Dec 20, 2021

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The density of a liquid is 1.2g/mL. There are 35 drops in 2 mL. The number of molecules in one drop

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A gaseous mixture is composed of equal number of moles of CH4, C2H5 and C2H2. The average molecular mass of mixture (in amu) is

Shakti Asked Dec 20, 2021

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ALOK_RAJ Asked Aug 18, 2023

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Which of the following molarity values of ions in an aqueous solution containing 5.85 % w/v NaCl , 5.55 % w/v CaCl2 and 6% w/v NaOH is/are correct :

ALOK_RAJ Asked Aug 18, 2023

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Aayush Asked Jan 31

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If 10^21 molecules are removed from 200 mg of CO2, then the number of moles of CO2 left are —

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ALOK_RAJ Asked Jul 25, 2023

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39.4 kg of gold was recovered from a Smuggler. The number of atoms of gold recovered are —

ALOK_RAJ Asked Jul 25, 2023

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Chandan Asked Aug 9, 2023

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Equal masses of sulphur dioxide and oxygen are mixed in an empty container at $25^{\circ} C$. The fraction of the total pressure exerted by sulphur dioxide is :

Chandan Asked Aug 9, 2023

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Chandan Asked Sep 15, 2023

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Determine the number of moles of a real gas required to occupy 1.44 m3 volume at its Boyle's temperature and 0.1 atm pressure.

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Aayush Asked Feb 1

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Caffeine has a molecular weight of 194 . It contains about 30% by mass of nitrogen. The number of atoms of nitrogen in one molecule of it is :

Aayush Asked Feb 1

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Aayush Asked Feb 1

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An organic compound on analysis was found to contain 0.032% of Sulphur by mass. The molecular mass of the compound, if its one molecule contains two Sulphur atoms, is :

Aayush Asked Feb 1

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Aayush Asked Feb 2

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If 6.3 g of NaHCO3 are added to 15.0 g of CH3COOH solution, the residue is found to weight 18.0 g. What is the mass of CO2 released in this reaction?

Aayush Asked Feb 2

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0.05 mole of LiAIH4 in ether solution was placed in a flask containing 74g (1 mole) of t-butyl alcohol. The product LiAIHC12H27O3 weighed 12.7 g. If Li atoms are conserved, the percentage yield is —

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0.65 g of Zn was put in a solution of 1.5 g CuSO4 and the Cu. thus precipitated weighed 0.635 g. what weight of the zinc sulphate will be recovered on evaporation of the remaining solution?

Aayush Asked Feb 2

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ALOK_RAJ Asked Nov 28, 2023

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The plot of 1/x_A versus 1/y_A (where x_A and y_A are the mole fractions of A in liquid and vapour phases respectively) is linear whose slope and intercept respectively are given as

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Chandan Asked Aug 13, 2023

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In ${PO}_4^{3-}$ ion, the formal charge on each oxygen atom and bond order of P-O bond are respectively

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test Asked Jun 8, 2022

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A compound contains equal masses of the elements A, B and C if the atomic weights of A, B and C are 20, 40 and 60 respectively. The empirical formula of the compound is

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ALOK_RAJ Asked Aug 31, 2023

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Which of the following statements regarding compressibility factor (Z) is/are correct :

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Shakti Asked Dec 20, 2021

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5.6 liters of gas at STP are found to have a mass of $11 \mathrm{~g}$. The molecular mass of the gas is

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Aayush Asked Jan 30

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A person adds 1.71 gram of sugar in order to sweeten his tea. The number of carbon atoms added are —

Aayush Asked Jan 30

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ALOK_RAJ Asked Aug 31, 2023

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Compressibility factor (Z) for N2 at $-23^{\circ} C$ and 25 atm pressure is 1.2. Calculate moles of N2 gas required to fill a gas cylinder of 7 liter capacity under the given conditions :

ALOK_RAJ Asked Aug 31, 2023

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AnjaliYadav Asked Sep 25, 2022

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The Vander Waals constant 'a' for the gases CH4, N2, NH3 and O2 are 2.25,1.39, 4.17 and 1.3 $L ^{2}$ $atm-mol^{-2}$ respectively. The gas which shows highest critical temperature is :

AnjaliYadav Asked Sep 25, 2022

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Aayush Asked Jan 31

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1.5 x 10^22 atoms of an element weight about 0.9 g. The atomic mass of the element (in amu) is —

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ALOK_RAJ Asked Aug 19, 2023

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What approximate volume of 0.40 M Ba(OH)2 solution must be added to 50.0 mL of 0.30 M NaOH solution to get a solution in which the molarity of the OH− ions is 0.50 M?

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ANAND_YADAV Asked Jul 30, 2023

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100 mL of sulphuric acid solution (sp. gr. $=1.84$ ) contains 98% by weight of pure acid. Calculate the volume of 0.46M NaOH solution (in L) required to just neutralize the above acid solution.

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ALOK_RAJ Asked Nov 28, 2023

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The pH of pure water at $25^{\circ} {C}$ and $35^{\circ} {C}$ are 7 and 6 respectively. The heat of formation of water from H+ and OH- is

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The standard reduction potentials of Pb and Zn electrodes are -0.126 and -0.763 volts respectively. The cell equation will be

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If the number of molecules of SO2 (molecular weight =64 ) effusing through an orifice of unit area of cross-section in unit time at 0∘C and 1 atm pressure is n

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2KI + I2 + 22 HNO3 $\rightarrow$ 2HIO3 + 2KIO3 + 22NO2 + 10H2O ; If 3 mole of KI & 2 moles I2 are reacted with excess of HNO3. Volume of NO2 gas evolved at NTP is

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Aayush Asked Jan 31

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Weight of copper oxide obtained by treating 2.16 g of metallic copper with nitric acid and subsequent ignition was 2.7 g.

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ANAND_YADAV Asked Jul 30, 2023

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The respective number of significant figures for the numbers $23.023,0.0003$ and $2.1 \times 10^{-3}$ are

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ANAND_YADAV Asked Jul 29, 2023

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An experiment measures quantities $x, y, z$ and then $t$ is calculated from the data as $t=\frac{x y^{2}}{z^{3}}$. If percentage errors in $x , y$ and $z$ are respectively $1 \%, 3 \%, 2 \%$, then percentage error in $t$ is :

ANAND_YADAV Asked Jul 29, 2023

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The oxidation number of Sulphur in S6, S2F2 and H2S respectively are —

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