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 |
 69%
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 |
 71%
From NCERT
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 |
 64%
From NCERT
NEET - 2023
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Calculate the mass of 95% pure CaCO3 that 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 up to 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 |
 70%
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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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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The density of a 2 M aqueous solution of NaOH is 1.28 g/cm3.
The molality of the solution is: 
[molecular mass of NaOH = 40 gmol-1]

1. 1.20 m 2. 1.56 m
3. 1.67 m 4. 1.32 m
Subtopic:  Concentration Based Problem |
 68%
From NCERT
NEET - 2019
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