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Home » Classes » Intermediate » Aptitude Test - 3
1.Actual yield of a chemical reaction is always less than theoretical yield because:
A. Side reactions
B. Wastage of products
C. Reversible reactions
D. Side reactions
2.Mass of sodium in 53 g of Na2CO3 is:
A. 23 g
B. 46 g
C. 92 g
D. 23 g
3.20 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
4.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
5.Molecular mass of water (18 g) means:
A. Mole
B. Gram mole
C. Gram molecule
D. Mole
6.Which of the following ion formation is always exothermic:
A. Uninegative
B. Unipositive
C. Dinegative
D. Uninegative
7.The number of isotopes of elements with even mass number and even atomic number are:
A. 280
B. 300
C. 154
D. 280
8.Which one of the following is not the mono isotopic element:
A. Arsenic
B. Uranium
C. Iodine
D. Arsenic
9.Percentage of oxygen in calcium carbonate is:
A. 40%
B. 48%
C. 12%
D. 40%
10.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
11.Which one of the following properties is always in whole number:
A. Atomic mass
B. Atomic radius
C. Atomic volume
D. Atomic mass
12.What is the mass of one mole of Iodine:
A. 53 g
B. 74 g
C. 127 g
D. 53 g
13.0.5 moles of H2SO4 contains �X� moles of oxygen atoms �X� is:
A. 0.5
B. 1
C. 2
D. 0.5
14.What will weigh more:
A. 2 mole N2
B. 1 mole O3
C. 2 mole O2
D. 2 mole N2
15.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
16.CO+ is an example of:
A. Free radical
B. Cationic molecular ion
C. Anionic molecular ion
D. Free radical
17.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
18.Percentage of oxygen in H2O is:
A. 80%
B. 88.80%
C. 8.80%
D. 80%
19.Large no of isotopes are known for the elements whose masses are multiple of:
A. Two
B. Four
C. Six
D. Two
20.The least no of molecules is present in 30 g of:
A. N2O
B. NO
C. NO2
D. N2O
21.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
22.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
23.An organic compound contains 2% of sulphur. The molar mass of compound is:
A. 200
B. 800
C. 1600
D. 200
24.The mass of 0.5 mole of Aluminium is:
A. 13 g
B. 13.5 g
C. 14 g
D. 13 g
25.Which of the following technique is used for the separation of insoluble particles from liquids?
A. Filtration
B. Crystallization
C. Solvent extraction
D. Filtration
26.Which of the following way in used for classification of chromatography?
A. Shape
B. Phase
C. Mechanism
D. Shape
27.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
28.Safe and the most reliable method of drying crystals is through
A. Filter paper
B. Vacuum desiccators
C. Oven
D. Filter paper
29.A substance having a very high vapour pressure at its melting point on heating will show
A. Melting
B. Sublimation
C. Decomposition
D. Melting
30.A process controlled by Distributive law is
A. Crystallization
B. Sublimation
C. Solvent extraction
D. Crystallization
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