A 6.85 g sample of the hydrates SrOH2.xH2O is dried in an oven to give 3.13 g of anhydrous SrOH2. What is the value of x?   (Atomic weights : Sr=87.60, O=16.0, H=1.0)

1.  8

2.  12

3.  10

4.  6

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

A sample of phosphorus that weights 12.4 g exerts a pressure 8 atm in a 0.821 litre closed vessel at 527°C. The molecular formula of the phosphorus vapour is:

1.  P2

2.  P4

3.  P6

4.  P8

Subtopic:  Ideal Gas Law |
 81%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Phosphoric acid H3PO4 prepared in a two step process.

(1) P4+5O2  P4O10
(2) P4O10+6H2O  4H3PO4

We allow 62g of phosphorus to react with react with excess oxygen which form P4O10 in 85% yield. In the step (2) reaction 90% yield of H3PO4 is obtained. Produced mass of H3PO4 is:

1.  37.485 g

2.  149.949 g

3.  125.47 g

4.  564.48 g

Subtopic:  Equation Based Problem |
 66%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

What volume of HCl solution of density 1.2 g/cm3 and containing 36.5% by weight HCl, must be allowed to react with zinc(Zn) in order to liberate 4.0 g of hydrogen?

1.  333.33 mL

2.  500 mL

3.  614.66 mL

4.  None of these

Subtopic:  Equation Based Problem |
 60%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

What is the molar mass of diacidic organic Lewis base (B), if 12 g of chloroplatinate salt BH2PtCl6 on ignition produced 5 gm residue of Pt?

1.  52

2.  58

3.  88

4.  None of these

Subtopic:  Moles, Atoms & Electrons |
 69%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

What volume of O2g measured at 1 atm and 273 K will be formed by action of 100 mL of 0.5 N KMnO4 on hydrogen peroxide in an acid solution? The skeleton equation for the reaction is
KMnO4+H2SO4+H2O2 K2SO4+MnSO4+O2+H2O

1.  0.12 litre

2.  0.028 litre

3.  0.56 litre

4.  1.12 litre

Subtopic:  Millimole/Equivalent Concept |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

Cisplatin, an anticancer drug, has the molecular formula PtNH32 Cl2. What is the mass (in gram) of one molecule? (Atomic weights : Pt=195, H=1.0, N=14, Cl=35.5)

1.  4.98×10-21

2.  4.98×10-22

3.  6.55×10-21

4.  3.85×10-22

Subtopic:  Moles, Atoms & Electrons |
 77%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

The conversion of oxygen to ozone occurs to the extent of 15% only. The mass of ozone that can be prepared from 67.2 L oxygen at 1 atm and 273 K will be:

1. 14.4 gm

2. 96 gm

3. 640 gm

4. 64 gm

Subtopic:  Moles, Atoms & Electrons |
 62%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Average atomic mass of magnesium is 24.31 a.m.u. This magnesium is compound of 79 mole% of Mg24 and remaining 21 mole % of Mg25 and Mg26. Calculate mole% of Mg26.

1.  10

2.  11

3.  15

4.  16

Subtopic:  Moles, Atoms & Electrons |
 62%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

Calculate the % of free SO3 in oleum (a solution of SO3 in H2SO4) that is labelled 109% H2SO4.

1. 40

2. 30

3. 50

4. None

 

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