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Hassan
1.20 moles each of Mg and O2 react to form MgO. The amount of MgO formed would be:
A. 20 g
B. 400 g
C. 800 g
D. 20 g
2.The number of peaks obtained in mass spectrometry shows:
A. Charge on isotope
B. Mass of isotope
C. Number of isotopes
D. Charge on isotope
3.Molecular mass of water (18 g) means:
A. Mole
B. Gram mole
C. Gram molecule
D. Mole
4.Which of the following ion formation is always exothermic:
A. Uninegative
B. Unipositive
C. Dinegative
D. Uninegative
5.The number of isotopes of elements with even mass number and even atomic number are:
A. 280
B. 300
C. 154
D. 280
6.Which one of the following is not the mono isotopic element:
A. Arsenic
B. Uranium
C. Iodine
D. Arsenic
7.Percentage of oxygen in calcium carbonate is:
A. 40%
B. 48%
C. 12%
D. 40%
8.Which one of the following substances is used as CO2 absorber in combustion analysis:
A. Mg (ClO4)2
B. 50% KOH
C. Lime water
D. Mg (ClO4)2
9.Which one of the following properties is always in whole number:
A. Atomic mass
B. Atomic radius
C. Atomic volume
D. Atomic mass
10.What is the mass of one mole of Iodine:
A. 53 g
B. 74 g
C. 127 g
D. 53 g
11.0.5 moles of H2SO4 contains “X” moles of oxygen atoms “X” is:
A. 0.5
B. 1
C. 2
D. 0.5
12.What will weigh more:
A. 2 mole N2
B. 1 mole O3
C. 2 mole O2
D. 2 mole N2
13.The number of electrons in one mole of H2 is:
A. 6.02 x 1023
B. 3.01 x 1023
C. 12.04 x 1023
D. 6.02 x 1023
14.CO+ is an example of:
A. Free radical
B. Cationic molecular ion
C. Anionic molecular ion
D. Free radical
15.Relative atomic mass is the mass of an atom of an element as compared to the mass of one atom of:
A. Oxygen
B. Hydrogen
C. Nitrogen
D. Oxygen
16.Percentage of oxygen in H2O is:
A. 80%
B. 88.80%
C. 8.80%
D. 80%
17.Large no of isotopes are known for the elements whose masses are multiple of:
A. Two
B. Four
C. Six
D. Two
18.The least no of molecules is present in 30 g of:
A. N2O
B. NO
C. NO2
D. N2O
19.How many atoms of carbon are present in 18 g of glucose C6H12O6:
A. 6.02 x 1022
B. 3.6 x 1023
C. 6.0 x 1023
D. 6.02 x 1022
20.The relative atomic mass of oxygen according to C -12.000 a.m.u standard is:
A. Less than 16
B. More than 16
C. 16 only
D. Less than 16
21.An organic compound contains 2% of sulphur. The molar mass of compound is:
A. 200
B. 800
C. 1600
D. 200
22.The mass of 0.5 mole of Aluminium is:
A. 13 g
B. 13.5 g
C. 14 g
D. 13 g
23.Which of the following technique is used for the separation of insoluble particles from liquids?
A. Filtration
B. Crystallization
C. Solvent extraction
D. Filtration
24.Which of the following way in used for classification of chromatography?
A. Shape
B. Phase
C. Mechanism
D. Shape
25.The fluted filter paper is used to
A. Filter hot solution
B. Avoid premature crystallization
C. Increase the rate of filtration
D. Filter hot solution
26.Safe and the most reliable method of drying crystals is through
A. Filter paper
B. Vacuum desiccators
C. Oven
D. Filter paper
27.A substance having a very high vapour pressure at its melting point on heating will show
A. Melting
B. Sublimation
C. Decomposition
D. Melting
28.A process controlled by Distributive law is
A. Crystallization
B. Sublimation
C. Solvent extraction
D. Crystallization
29.A technique of partition chromatography in which the solvent is in a pool at the bottom of container
A. Adsorption chromatography
B. Ascending chromatography
C. Radial chromatography
D. Adsorption chromatography
30.Different components of a mixture have different Rf values due to
A. Polar solvent used
B. Combination of solvents used
C. Their different distribution coefficients in the solvent
D. Polar solvent used
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