JEE Main 2023 · 10 Apr 2023 Shift 2

The correct relationships between unit cell edge length 'a' and radius of sphere 'r' for face-centred and body-centred cubic structures respectively are:

1. A2√2r = a and 4r = √3a
2. Br = 2√2a and 4r = √3a
3. Cr = 2√2a and √3r = 4a
4. D2√2r = a and √3r = 4a

Ferric chloride is applied to stop bleeding because -

1. AFeCl₃ reacts with the constituents of blood which is a positively charged sol.
2. BCl⁻ ions cause coagulation of blood.
3. CFe³⁺ ions coagulate blood which is a negatively charged sol.
4. DBlood absorbs FeCl₃ and forms a complex.

The correct order of metallic character is =

1. AK > Ca > Be
2. BBe > Ca > K
3. CK > Be > Ca
4. DCa > K > Be

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Physical properties of isotopes of hydrogen are different. Reason R : Mass difference between isotopes of hydrogen is very large. In the light of the above statements, choose the correct answer from the options given below:

1. ABoth A and R are true and R is the correct explanation of A
2. BBoth A and R are true but R is NOT the correct explanation of A
3. CA is true but R is false
4. DA is false but R is true

Number of water molecules in washing soda and soda ash respectively are:

1. A10 and 1
2. B1 and 10
3. C10 and 0
4. D1 and 0

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : The energy required to form Mg²⁺ from Mg is much higher than that required to produce Mg⁺ Reason R : Mg²⁺ is small ion and carry more charge than Mg⁺ In the light of the above statements, choose the correct answer from the options given below.

1. ABoth A and R are true and R is the correct explanation of A
2. BBoth A and R are true but R is NOT the correct explanation of A
3. CA is true but R is false
4. DA is false but R is true

The correct order of the number of unpaired electrons in the given complexes is

1. A[Fe(CN)₆]³⁻
2. B[FeF₆]³⁻
3. C[CoF₆]³⁻
4. D[Cr(oxalate)₃]³⁻
5. E[Ni(CO)₄] Choose the correct answer from the options given below:

The delicate balance of CO₂ and O₂ is NOT disturbed by

1. ABurning of Coal
2. BBurning of petroleum
3. CDeforestation
4. DRespiration