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Questions + Answers key
Take MCQ Chemistry Test
1.
Consider the isoelectronic species, Na+.Mg2+, F- and O2-. The correct order of increasing length of their radii is ______.
\(\mathrm{F}^{-}<\mathrm{O}^{2-}<\mathrm{Mg}^{2+}<\mathrm{Na}^{+}\)
\(\mathrm{Mg}^{2+}<\mathrm{Na}^{+}<\mathrm{F}^{-}<\mathrm{O}^{2-}\)
\(\mathrm{O}^{2-}<\mathrm{F}^{-}<\mathrm{Na}^{+}<\mathrm{Mg}^{2+}\)
\(\mathrm{O}^{2-}<\mathrm{F}^{-}<\mathrm{Mg}^{2+}<\mathrm{Na}^{+}\)
2.
Which of the following is not an actinoid?
Curium (Z = 96)
Californium (Z = 98)
Uranium (Z = 92)
Terbium (Z = 65)
3.
If travelling at same speeds, which of the following matter waves have the shortest wavelength?
Electron
Alpha particle ( He2+)
Neutron
Proton
4.
If the concentration of glucose (C6H12O6) in blood is 0.9 g L- 1, what will be the molarity of glucose in blood?
5 M
50 M
0.005 M
0.5 M
5.
What will be the molarity of a solution, which contains 5.85 g of NaCI(s) per 500 mL?
4 mol L- 1
20 mol L-1
0.2 mol L-1
2 mol L-1
6.
What is the mass per cent of carbon in carbon dioxide?
0.034%
27.27%
3.4%
28.7%
7.
The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?
4 g He
46 g Na
0.40 g Ca
12 g He
8.
Which of the following statements indicates that law of multiple proportion is being followed?
Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1 : 2.
Carbon forms two oxides namely CO2 and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2 :1.
When magnesium burns in oxygen, the amount of magnesium taken for the reaction is equal to the amount of magnesium in magnesium oxide formed.
At constant temperature and pressure, 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour.
9.
If the density of a solution is 3.12 g ml-1, the mass of 1.5 mL solution in significant figures is _____.
4.7 g
4680 x 10-3 g
4.680 g
46.80 g
10.
A measured temperature on Fahrenheit scale is 200°F. What will this reading be on celsius scale?
40°C
94 °C
93.3 °C
30°C
1.
(d)
\(\mathrm{O}^{2-}<\mathrm{F}^{-}<\mathrm{Mg}^{2+}<\mathrm{Na}^{+}\)
2.
(d)
Terbium (Z = 65)
3.
(b)
Alpha particle ( He2+)
4.
(c)
0.005 M
5.
(c)
0.2 mol L-1
6.
(b)
27.27%
7.
(d)
12 g He
8.
(b)
Carbon forms two oxides namely CO2 and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2 :1.
9.
(a)
4.7 g
10.
(c)
93.3 °C
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