CBSE Class 10 Science 2021 Term 1 Solved Paper

It consists of three cases followed by questions. There are a total of 12 questions (Q. No. 49 to 60 ) in this section. Attempt any 10 questions from this section. The first attempted 10 questions would be evaluated. P-Did not react eiter with cold or hot water but reacted with steam
Q- Reacted with hot water and the metal started floating
R - Reacted violently with cold water
S- Did not react with water at all
Based on the above observation answer the following:
Case-I:
A student, took four metals P,Q,R, and S and carried out different experiments to study the properties of metals. Some of the observation were:
- All metal could not be cut with knife except metal R.
- Metal P combined with oxygen to form an oxide M2O3 which reacted with both acids and bases.
- Reaction with water.

Question : 53

Total: 60

The haemodialyzer has semi-permeable lining of tubes which help to:

To maintain osmotic pressure of blood.
To filter nitrogenous wastes from the dialyzing solution.
In passing the waste products in the dialyzing solution.
To pump purified blood back into the body of the patient.

Solution:

The haemodialyzer has semipermeable lining of tubes that remains suspended in a tank filled with a dialyzing fluid having the same osmotic pressure as blood. The patient's blood is passed through these tubes. These tubes help in passing only selective products such as waste products from the blood to the dialysing fluid. The purified blood is sent back into the patient's body after filtration.

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