The mass of  CO2 produced by heating 20 g of 20% pure limestone
as per the given below equation is:

 \(\left[\mathrm{CaCO}_3 \stackrel{1200 \mathrm{~K}}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_2\right] \)
1. 1.32 g  2. 1.12 g 
3. 1.76 g  4. 2.64 g
Subtopic:  Equation Based Problem |
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From NCERT
NEET - 2023
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Select the correct statements from the following: 
A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is \(9.10939 \times 10^{-31} \mathrm{~kg} \text {. }\).
C. All the isotopes of a given element show same chemical properties.
D. Protons and electrons are collectively known as nucleons. 
E. Dalton's atomic theory regarded the atom as an ultimate particle of matter. 
Choose the correct answer from the option given below: 
1. B, C and E only  2. A, B and C only 
3. C, D and E only  4. A and E only 
Subtopic:  Introduction |
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NEET - 2023
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The density of 1 M solution of a compound 'X' is 1.25 g mL-1. The correct option for the molality of  solution is:
(Molar mass of compound X = 85 g): 
1. 0.705 m  2. 1.208 m 
3. 1.165 m  4. 0.858 m 
Subtopic:  Concentration Based Problem |
 65%
From NCERT
NEET - 2023
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What mass of 95% pure CaCO3 will be required to neutralize 50 mL of 0.5 M HCl solution according to the following reaction?
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + 2H2O(l)
[Calculate upto the second place of decimal point]
1. 9.50 g 2. 1.25 g
3. 1.32 g 4. 3.65 g
Subtopic:  Equation Based Problem |
 51%
From NCERT
NEET - 2022
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Match list-I with list-II:

List-I List-II
(a) 4.48 litres of O2 at STP (i) 0.2 moles
(b) 12.022 × 1022 molecules of H2O (ii) 12.044 × 1023 molecules
(c) 96 g of O2 (iii) 6.4 g
(d) 88 g of CO2 (iv) 67.2 litres at STP
(Given - Molar volume of a gas at STP - 22.4 L)
Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (i) (iii) (iv) (ii)
2. (iii) (i) (iv) (ii)
3. (iv) (i) (ii) (iii)
4. (iii) (i) (ii) (iv)
Subtopic:  Moles, Atoms & Electrons |
From NCERT
NEET - 2022
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The mass of a 2.5 mL solution (the density of the solution is 2.15 g/mL) in the correct significant figures is:

1.  5375 × 10–3 g
2.  5.4 g
3.  5.38 g
4.  53.75 g
Subtopic:  Introduction |
 70%
From NCERT
NEET - 2022
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An organic compound contains 80 % (by wt.) carbon and the remaining percentage of hydrogen. The empirical formula of this compound is:
[Atomic wt. of C is 12, H is 1] 

1. CH3 2. CH4
3. CH 4. CH2
Subtopic:  Empirical & Molecular Formula |
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From NCERT
NEET - 2021
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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 |
 78%
From NCERT
NEET - 2020
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One mole of carbon atom weighs 12 g, the number of atoms in it is equal to, (Mass of carbon – 12 is 1.9926×10-23 g)

1. 1.2×1023

2. 6.022×1022

3. 12×1022

4. 6.022×1023

Subtopic:  Moles, Atoms & Electrons |
 77%
From NCERT
NEET - 2020
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The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is -

1. 40 mol 2. 10 mol
3. 20 mol 4. 30 mol
Subtopic:  Limiting Reagent | Equation Based Problem |
 78%
From NCERT
NEET - 2019
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