Processing math: 100%

CBSE Questions for Class 11 Medical Chemistry Some Basic Concepts Of Chemistry Quiz 8 - MCQExams.com

Calculate the total number of oxygen atoms present in 1.80g of glucose (C6H12O6).
  • 46.138×1021
  • 36.138×1021
  • 26.138×1021
  • 6.138×1021
A precipitate of AgClAgCl and AgBrAgBr has the mass 0.40660.4066 g. On heating a current of chlorine, the AgBrAgBr is converted to AgClAgCl and the mixture loses 0.07250.0725 in mass. The %% of mass in the original mixture is (as the nearest integer) :
  • 2 %
  • 6 %
  • 5%
  • 95%
Carbon dating method is used to determine the age of ________.
  • Rock
  • Fossils
  • Trees
  • Ancient monuments
What mass of propene is formed from 34.0 g of iodopropane on heating with ethanolic KOH, if the yield is 36 %?
  • 17.2 g
  • 8.4 9
  • 3.024 g
  • 1.72 g
An organic compound made of C,H and N contains 20% nitrogen. Its  minimum molecular weight is:
  • 70
  • 140
  • 100
  • 65
CH3CH2CH2CH3(g)CH3C|HCH3isobutaneCH3(g)
  • 75%
  • 90%
  • 30%
  • 60%
What will be the mass percentage of a resulting solution prepared by mixing 15% (w/w) 500 g aqueous solution of the area with 25% (w/w) 400g aqueous solution of it?
  • 18%
  • 20%
  • 25%
  • 15%
The critical volume of a gas is 0.036 lit.mol1. The radius of the molecule will be (in cm):
(Avogadro Number = 6×1023)
  • (94π×1023)13
  • (8π3×1023)13
  • (38π×1023)13
  • none of these
A sample of oxygen contain 168O,178O and 188O atoms has average atomic mass 16.12. If mole % of 168O is 90, then weight % of 188O is 
  • 2
  • 2.33
  • 1.79
  • 8
At 500C, liquid NH3 has ionic product is 1030. How many amide (NH2) ions are present per mm3 in pure liquid NH3 ? Take Na=6×1023
  • 602
  • 567
  • 450
  • 892
What will be the mass of 100 atoms of hydrogen?
  • 100 g
  • 1.66×1022 g
  • 6.023×1023 g
  • 100×6.023×1023 g
For every ,one 37Cl isotope there are three 35Cl isotopes, in a sample of chlorine. What will be the average atomic mass of chlorine?
  • 35
  • 37
  • 35.5
  • 35.6
At 80C the vapour pressure of pure liquid A is 250 mm of Hg and that of pure liquid B is 1000 mm of Hg. If a solution of A and B boils at 80C and 1 atm pressure, the amount of A in the mixture is (1 atm = 760 mm Hg) 
  • 50 mole percent
  • 52 mole percent
  • 34 mole percent
  • 48 mole percent
Which symbol is used to represent the unit of atomic mass, amu?
  • u
  • A
  • M
  • n
4.88 g of KClO3 when heated produced 1.92 g of O2 and 2.96 g of KCl. Which of the following statements regarding the experiment is correct?
  • The result illustrates the law of conservation of mass.
  • The result illustrates the law of multiple proportions.
  • The result illustrates the law of constant proportion.
  • None of the above laws is being illustrated here.
Which of the following statements best explains the law of conservation of mass, concerning a chemical change?
  • 100 g of water is heated to give steam.
  • A sample of N2 gas is heated at constant pressure without any change in mass.
  • 36 g of carbon combines with 32 g of oxygen to form 68 g of CO2.
  • 10 g of carbon is heated in vacuum without any change in mass.
Oxygen occurs in nature as a mixture of isotopes 16O, 17O and 18O having atomic masses of 15.995 u, 16.999 u and 17.999 u and relative abundance of 99.763%, 0.037%, and 0.200% respectively. What is the average atomic mass of oxygen?
  • 15.999 u
  • 16.999 u
  • 17.999 u
  • 18.999 u
The density of a gas is 1.78 g L1 at STP. The weight of one mole of gas is:
  • 39.9 g
  • 22.4 g
  • 3.56 g
  • 29 g
Which of the following gases will have least volume if 10 g of each gas is taken at same temperature and pressure?
  • CO2
  • N2
  • CH4
  • HCl
Total number of atoms present in 34 g of NH3 is:
  • 4×1023
  • 4.8×1021
  • 2×1023
  • 48×1023
A solution is prepared by adding 5 g of a solute X to 45 g of solvent Y. What is the mass percent of solute X?
  • 10%
  • 11.1%
  • 90%
  • 75%
The correct match is 
1528901_227219042fb042b7ba7f3c4bbfb8ee16.jpg
  • a=pb=rc=qd=s
  • a=rb=qc=sd=p
  • a=rb=qc=pd=s
  • a=rb=pc=sd=q
How much mass of sodium acetate is required to make 250 mL of 0.575 molar aqueous solution? 
  • 11.79g
  • 15.38g
  • 10.81g
  • 25.35g
An impure sample of silver (1.5 g) is heated with S to form 0.124 g of Ag2S. What was the per cent yield of Ag2S?
  • 21.6%
  • 7.2%
  • 1.7%
  • 24.8%
How many number of aluminium ions are present in 0.051 g of aluminium oxide? 
  • 6.023×1020 ions
  • 3 ions
  • 6.023×1023 ions
  • 9 ions
Which scientist discovered that the same amount of space was occupied by equal numbers of molecules of gases, irrespective of whether it was hydrogen or chlorine or fluorine?
  • Gay-Lussac
  • Avogadro
  • Marconi
  • Wohler
What will be the weight of CO having the same number of oxygen atoms as present in 22 g of CO2?
  • 28 g
  • 22 g
  • 44 g
  • 72 g
Which of the following statement about Avogadro's hypothesis is correct?
  • At NTP all gases contain same number of molecules
  • Under similar conditions of temperature and pressure, gases react with each other in simple ratio.
  • Under similar conditions of temperature and pressure, equal volumes of all gases contain same number of molecules
  • Gases always react with gases only at the given temperature and pressure
Read the passage given below and answer the question:
Chemical reactions involve the interaction of atoms and molecules. A large number of atoms/molecules (approximately 6.023×1023) are present in few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. This concept has implications in diverse areas such as analytical chemistry,  biochemistry, electrochemistry, and radiochemistry. the following example illustrates a typical case, involving chemical/electrochemical reaction, which requires a clear understanding of the mole concept.
A 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolyzed. This leads to the evolution of chlorine gas at one of the electrodes (atomic mass: Na = 23, Hg = 200; 1 faraday =96500 coulombs). 
If the cathode is a Hg electrode, the maximum weight (g) of amalgam formed from this solution is:
  • 200
  • 225
  • 400
  • 446
Major problems faced by energy section are
  • Rising oil prices
  • Rising oil import bill
  • Sick SEBs
  • All of the above
How many grams NaOH are present in 250 mL of 0.5 M NaOH solution?
  • 7.32g
  • 3.8g
  • 5g
  • 0.5g
According to Avogadro's hypothesis, equal volumes of gases under the same conditions of temperature and pressure will contain:
  • the same number of molecules
  • different number of molecules
  • the same number of molecules only if their molecular masses are equal
  • the same number of molecules if their densities are equal.
'Equal volumes of all gases at the same temperature and pressure contain equal number of molecules'. This law is called as
  • Boyle's law
  • Charle's law
  • Avogadro's law
  • Gay Lussac's law
Thermal electricity is generated from:
  • oil
  • coal
  • gas
  • all of the above
A sample of calcium carbonate (CaCO3) has the following percentage composition: Ca=40%; C=12%; O=48%.
If the law of constant proportions is true, then the weight of calcium in 4g of a sample of calcium carbonate from another source will be:
  • 0.016 g
  • 0.16 g
  • 1.6 g
  • 16 g
0.46 g of an organic compound  was analysed. The increase in mass of CaCl2 U-Tube  was 0.54 g and potash bulb was 0.88 g. The percentage composition  of the compound is:
  • C=52.17%, H=13.04%, O=34.79%
  • C=50%,H=50%
  • C=32.19%,H= 18.01%,O=49.8%
  • C=72%,H=28%
One gm metal M3+ was discharged by the passage of 1.81×1023 electrons. What is the atomic mass of metal?
  • 8g/mol
  • 9g/mol
  • 10g/mol
  • None of these
The number of atoms in 67.2 L of NH3(g) at STP is:
  • 9 NA
  • 12 NA
  • 3 NA
  • 4 NA
The density (in g ml1) of a 3.60M sulphuric acid solution having 29% H2SO4 [molar mass =98g mol1] by mass, will be:
  • 1.64
  • 1.88
  • 1.22
  • 1.45
A sample of municipal water contains one part of urea (molecular wt =60) per million parts of water by weight. The number of urea molecules in a drop of water of volume 0.05 ml is 
  • 2.5×1014
  • 5×1014
  • 5×1013
  • 5×1015
A 10.0g a sample of a mixture of calcium chloride and sodium chloride is treated with Na2CO3 to precipitate the calcium as calcium carbonate. This CaCO3 is heated to convert all the calcium to CaO and the final mass of CaO is 1.62gms. The % by mass of CaCl2 in the original mixture is :
  • 15.2%
  • 32.1%
  • 21.8%
  • 11.07%
If you are given Avogadro's number of atoms of a gas X. If half of the atoms are converted into X+(g) by energy ΔH. The IE of X is :
  • 2ΔHNA
  • 2NAΔH
  • ΔH2NA
  • NAΔH
The mass of a molecule of the compound C60H122 is __________.
  • 1.4×1021 g
  • 1.09×1021 g
  • 5.025×1023 g
  • 16.023×1023 g
The total number of electrons in 4.2 g of N3 ion is: (NA is the Avogadro's number )
  • 2.1NA
  • 4.2NA
  • 3NA
  • 3.2NA
The percentage of pyridine (C5H5N) that forms pyridinium ion (C5H5NH) in a 0.10M aqueous pyridine solution is:
[Kb for C5H5N=1.7×109]
  • 0.77%
  • 1.6%
  • 0.0060%
  • 0.013%
The amount of zinc required to produce 224 ml of H2 at NTP on treatment with dilute H2SO4 solution will be:
  • 0.65g
  • 0.065 g
  • 65g
  • 6.5g
What quantity of lime stone on heating will give 56 kg of CaO?
  • 1000 kg
  • 56 kg
  • 44 kg
  • 100 kg
What mass of sodium chloride will react with 34.0 g of silver nitrate to produce 17 g of sodium nitrate and 28.70 g of silver chloride if the law of conservation of mass holds good ?
  • 12.35 grams
  • 11.70 grams
  • 9.32 grams
  • None of these
If average molecular wt. of air is 29, then assuming N2 and O2 gases are there which options are correct regarding composition of air:
i) 75% by mass of N2
ii) 75% by moles N2
iii) 72.41% by mass of N2
  • only (i) is correct
  • only (ii) is correct
  • both (ii) and (iii) are correct
  • both (i) and (ii) are correct
4.6 cm3 of methyl alcohol is dissolved in 25.2g of water with density 0.8. Calculate % by mass of methyl alcohol.
  • 14.72
  • 10.67
  • 12.74
  • 13.45
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Chemistry Quiz Questions and Answers