ISC (Science) ISC Class 12 - CISCE Question Bank Solutions

Give one significant difference between primary lymphoid organs and secondary lymphoid organs. Give one example of each.

What is the genotype of Turner's Syndrome?

Mention any one symptom of Turner's syndrome.

Jacob is genetically a carrier of the disorder that affects the shape of the RBCs, as shown in the diagram below. His son James suffers from the same disorder.

1. Give the biochemical reason for the disorder that changes the shape of the RBCs, as shown above.
2. Draw a Punnett square to show the genotype of the mother of James.
3. Name and define the type of 'point mutation' responsible for this disorder.

If a person shows the production of interferons in his body, then he is suffering from ______.

Discuss the various In-situ and Ex-situ strategies for conservation of biodiversity. 

State any three goals of the human genome project.

Give one significant contribution to the following scientists:

Sanger

An aqueous solution containing 12.48 g of barium chloride (BaCl₂) in 1000 g of water, boils at 100.0832°C. Calculate the degree of dissociation of barium chloride. 
(K_b for water = 0.52 K kg mol⁻¹, at. wt. Ba = 137, Cl = 35.5)

An aqueous solution containing 12.50 g of barium chloride in 1000 g of water boils at 373.0834 K. Calculate the degree of dissociation of barium chloride.

Given K_b for H₂O = 0.52 K kg mol⁻¹; molecular mass of BaCl₂ = 208.34 g mol⁻¹.

A 2 molal solution of sodium chloride in water causes an elevation in the boiling point of water by 1.88 K. What is the value of Van’t Hoff factor? What does it signify? [K_b = 0.52 K kg mol⁻¹]

Name the law or principle to which the following observations confirm:

When 9650 coulombs of electricity is passed through a solution of copper sulphate, 3.175 g of copper is deposited on the cathode (at. wt. of Cu = 63.5).

What is ferromagnetism?

What type of magnetism is shown in the following alignment of magnetic moments?

Define the following term:

Ferromagnetism

The complexion [Ni(CN)₄]^2- is:

Explain why:
(i) Transition elements form coloured compounds. 
(ii) Interhalogen compounds are more reactive than their constituent elements.
(iii) Cu⁺ is diamagnetic but Cu²⁺ is paramagnetic. (Z = 29)

Which one of the following compounds is diamagnetic and colourless?

Give a reason for the following:

Cu⁺² salts are paramagnetic, while Cu⁺ salts are diamagnetic.

The metal complex ion that is paramagnetic is ______.

(Atomic number of Fe = 26, Cu = 29, Co = 27 and Ni = 28)