A purified pepsin was subjected to amino acid analysis. The amino acid present in the smallest amount was lysine, C6H14N2O2 and the amount of lysine was found to be 0.431g per 100 g of protein. The minimum molecular mass of protein is:

1. 34 u

2. 3400 u

3. 34,000 u

4. 3,400,000 u

Subtopic:  Moles, Atoms & Electrons |
 64%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The number of valence electrons present in 0.53 grams of Na2COis:

1. 3.01×1023

2. 7.22×1022

3. 12.046×1023

4. 6.023×1023

Subtopic:  Moles, Atoms & Electrons |
 60%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

At STP, the density of CCl4 vapour in g/L will be closest to: 

1. 8.67

2. 6.87

3. 3.67

4. 4.26

Subtopic:  Concentration Based Problem |
 76%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

If 3.02×1019 molecules are removed from 98 mg of H2SO4, then the number of moles of H2SO4 left are -

1. 0.1×10-3

2. 9.5×10-4

3. 1.2×10-4

4. 0.5×10-3

Subtopic:  Moles, Atoms & Electrons |
 61%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A chloride of a metal (M) has 65.5% of chlorine. 100 ml of vapour of the chloride of metal at STP weighs 0.72 g. The molecular formula of this metal chloride is

1. MCl3 

2. MCl4 

3. M2Cl3 

4. MCl5 

Subtopic:  Moles, Atoms & Electrons |
 53%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The molality of 0.01 M Na2CO3 solution is:
(The density of the solution is 1.1 g/ml)

1. 9×10-3

2. 1.8×10-3

3. 4.5×10-3

4. 1.1×10-3

Subtopic:  Concentration Based Problem |
 63%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The weight of 1x1023 molecules of CuSO4.5H2O is: 

1. 34.42 g

2. 41.42 g

3. 54.44 g

4. 68.94 g

Subtopic:  Moles, Atoms & Electrons |
 73%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

lf Nis Avogadro's number, then the number of valence electrons in 4.2 g of nitride ions (N3-) will be:

1. 3.2 NA 2. 1.6 NA
3. 2.4 NA 4. 1.2 NA
Subtopic:  Moles, Atoms & Electrons |
 63%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

ln the final answer of the expression \(\large{\frac{(29.2-20.2)\times(1.79\times10^5)}{1.37}}\)
the number of significant figures after solving the expression is:

1. 2 2. 4
3. 6 4. 7
Subtopic:  Introduction |
 59%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

When 7.3 g of magnesium bicarbonate (Mg(HCO3)2) is decomposed by heating, how much carbon dioxide gas (in mL) is released at STP?

1. 1000 mL

2. 1120 mL

3. 2230 mL

4. 3240 mL

Subtopic:  Moles, Atoms & Electrons |
 51%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch