The number of significant figures in the following numbers is:

 (I). 161 cm (II). 0.0161 (III). 1.61

1. 3, 3, 3
2. 3, 4, 3
3. 3, 2, 3
4. 3, 4, 4

Subtopic:  Introduction |
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AIPMT - 1998
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If the density of the solution is 3.12 g ml-1, then what will be the mass of the 1.5 ml solution in two significant figures?

 1 $$4.4~\mathrm{g}$$ 2 $$4680 \times 10^{3} ~\mathrm{g}$$ 3 $$4.7~\mathrm{g}$$ 4 $$46.80~\mathrm{g}$$
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The correct match is:
 List I List II a. Micro i. ${10}^{-15}$ m b. Mega ii. ${10}^{-6}$ m c. Giga iii. ${10}^{6}$ m d. Femto iv. ${10}^{9}$ m

 a b c d 1. i iv iii ii 2. iii iv ii i 3. ii iii iv i 4. i iii iv ii
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Match the following physical quantities with units.

 Physical quantity Unit A. Molarity 1. mol kg-1 B. Molality 2. mol L-1 C. Pressure 3. Candela D. Luminous intensity 4. Pascal

Codes

 A B C D 1. 1 4 2 3 2. 2 1 4 3 3. 1 4 3 2 4. 4 1 3 2
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Consider the two statements:
 Statement I: Scientific notation for 0.00016 is $$1.6 \times 10^{-3}$$. Statement II: The volume of water to be added to change the molarity of 200 mL 0.5 M aqueous solution to 0.1 M is 800 mL

 1 Statement I is correct, Statement II is correct. 2 Statement I is incorrect, Statement II is correct. 3 Statement I is correct, Statement II is incorrect. 4 Statement I is incorrect, Statement II is incorrect.
Subtopic:  Introduction |
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Which, of the following, laws of chemical combination is followed by $$N_2O~, NO$$ and $$N_2O_3$$ ?
1. Law of conservation of mass
2. Law of multiple proportions
3. Law of constant proportions
4. Gay Lussac's law of constant volume
Subtopic:  Introduction |
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How many chlorine atoms are in 1.00 mL of CCl4 (M=153.8, density=1.59 g mL-1)?

1. 1.56×1021
2. 6.23×1021
3. 1.57×1022
4. 2.49×1022
Subtopic:  Moles, Atoms & Electrons |
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If Avogadro number $$N_{A}$$, is changed from $$6 . 022 \times \left(10\right)^{23}$$$$\text{mol}^{- 1}$$ to $$6 . 022 \times \left(10\right)^{20} ~\text{mol}^{- 1}$$ this would change:

 1 The definition of mass in units of grams 2 The mass of one mole of carbon 3 The ratio of chemical species to each other in a balanced equation 4 The ratio of elements to each other in a compound
Subtopic:  Moles, Atoms & Electrons |
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NEET - 2015
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The maximum number of atoms is present in which of the following -

1. 1 g of Mg(s)

2. 1 g of O2 (g)

3. 1 g of Li(s)

4. 1 g of Ag(s)

Subtopic:  Moles, Atoms & Electrons |
79%
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NEET - 2020
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Which one of the following samples of gases contains the most particles?
All gases are at 0 °C and 1 atm pressure when 1 mole of gas has a volume of 22.4 L.

[Relative atomic mass, Ar : H = 1, He = 4, C = 12, O = 16, Cl = 35.5]

1. 33.6 L of chlorine gas
2. 66.0 g of carbon dioxide gas
3. 22.4 L of hydrogen gas
4. 10.0 g of helium gas
Subtopic:  Moles, Atoms & Electrons |
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