1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel. Which reactant is left in excess and how much?

(At. weight of Mg = 24, O=16)

1. Mg, 0.16g

2. O2, 0.16g

3. Mg, 0.44g

4. O2, 0.28g

Subtopic:  Equation Based Problem |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (at. weight = 78.4), then minimum molecular weight of peroxidase anhydrase enzyme is

1. 1.568 x 10

2. 15.68

3. 2.168 x 10

4. 1.568 x 10

Subtopic:  Moles, Atoms & Electrons |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


Number of moles of MnO4- required to oxidise one mole of ferrous oxalate completely in acidic medium will be 

1. 0.6 mole

2. 0.4 mole

3. 7.5 moles

4. 0.2 mole

Subtopic:  Equation Based Problem |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


The total number of valence electrons in 4.2g of N3- ion is (NA is the Avogadro's number)

1. 2.1NA 

2. 4.2NA 

3. 1.6NA 

4. 3.2NA 

Subtopic:  Moles, Atoms & Electrons |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


When 22.4L of H2(g) is mixed with 11.2L of Cl2(g) each at STP, the moles of HCl(g) formed is equal to 

1. 1 mole of HCl(g)

2. 2 moles of HCl(g)

3. 0.5 mole of HCl(g)

4. 1.5 moles of  HCl(g)

Subtopic:  Moles, Atoms & Electrons |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (at. mass of Al = 27)

1. 180 kg

2. 270 kg

3. 540 kg

4. 90 kg

Subtopic:  Equation Based Problem |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


In Haber process 30L of  dihydrogen and 30L of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gasesous mixture under the a fore said condition in the end?

1. 20L ammonia, 10L nitrogen, 30L hydrogen

2. 20L ammonia, 25L nitrogen, 15L hydrogen

3. 20L ammonia, 20L nitrogen, 20L hydrogen

4. 10L ammonia, 25L nitrogen, 15L hydrogen

Subtopic:  Limiting Reagent |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


The number of atoms in 4.25 g of NH3 is approximately

1. 4 x 1023 

2. 2 x 1023 

3. 1 x 1023 

4. 6 x 1023 

Subtopic:  Moles, Atoms & Electrons |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


In the reaction, 4NH3(g)+ 5O2(g) 4NO(g) +6H2O(l)

When 1 mole of ammonia and 1 mole of O2 are made to react to completion, then

1. 1.0 mole of H2O is produced 

2. 1.0 mole of NO will be produced

3. all the oxygen will be consumed

4. all the ammonia will be consumed

Subtopic:  Equation Based Problem |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:


An element, X has the following isotopic composition:

200X : 90%, 199X : 8.0%, 202X : 2.0%

The weighted average atomic mass of the naturally occurring element X is closest to 

1. 201 u

2. 202 u

3. 199 u

4. 200 u

Subtopic:  Moles, Atoms & Electrons |
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level: