Welcome to your Some Basics Concepts of Chemistry
1.
The number of significant figures for the three numbers 193 cm, 0.193 cm, 0.0193 cm are:
2.
The equivalent weight of an acid is equal to:
3.
Avogadro’s number is the number of molecules present in:
4.
A mole of any substance is related to:
5.
25 mL of Ba(OH)₂ titrated with 0.1 M HCl requires 35 mL. Molarity of Ba(OH)₂?
6.
Number of atoms in 560 g Fe (atomic mass 56)?
7.
Number of oxygen atoms in 6.4 g SO₂?
8.
Volume of H₂ at STP needed to obtain 21.6 g B from BCl₃ reduction?
9.
Moles of KCl in 1000 mL of 3 M solution
10.
Metal has specific heat 0.16 cal/g°C. Atomic wt?
11.
Relation between molecular mass & vapour density:
12.
Moles of KClO₃ needed to produce 67.2 L O₂ at STP?
13.
Mass of H₃PO₄ needed to neutralize 120 g NaOH?
14.
Na₂CO₃·nH₂O loses 63% mass on heating. n = ?
15.
Vapour density of NO₂ + N₂O₄ mixture = 27.6. Mole fraction of NO₂?
16.
Illustrates law of multiple proportions
17.
The value of 1 amu is equal to:
18.
Normality of 0.04 M H₂SO₄ is:
19.
Which among the following is heaviest?
20.
No. of moles present in 3.6 mL water (density = 1 g/mL)
21.
Boy drinks 500 mL of 9% glucose solution. Amount of glucose consumed?
22.
Pollution of SO₂ in air is 10 ppm by volume. Volume of SO₂ per 100 L air?
23.
Molarity of pure water is
24.
Grams of dibasic acid (MW = 200) in 100 mL decinormal solution?
25.
Normality of 0.3 M H₃PO₄?
26.
2 g O₂ at NTP occupies volume:
27.
Max number of O atoms?
28.
7.5 g gas occupies 5.6 L at STP. Gas is:
29.
50 g CaCO₃ completely decomposed. Weight of CaO residue?
30.
Density of gas (MW = 45) at STP?
31.
One mole of a substance present in 1 kg solution. Correct statement?
32.
Moles of acidified FeSO₄ oxidized by 1 mol KMnO₄?
33.
Compound with 8% sulphur by mass. Molar mass?
34.
Vapour density of O₃ is:
35.
Weight of one molecule of C₂H₄Cl₂?
36.
1000 g CaCO₃ solution contains 10 g CaCO₃. Concentration?
38.
Moles of solute per kg solvent is:
39.
The maximum number of molecules is present in:
40.
If 1/6 instead of 1/12 mass of C atom is taken as amu, molar masses will:
41.
Incorrect statement for 14 g CO:
42.
Nuclear cross-section unit "barn" equals:
43.
Which statement is correct?
44.
Which gas pairs contain equal number of molecules?
45.
Relation between molecular mass & vapour density:
