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. 106 m
d. Femto iv. 109 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.
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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 
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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 NA, is changed from 6.022×1023 mol-1 to 6.022×1020 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 |
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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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