The S Block Elements

Which of the following statements is not true regarding the oxygen flux within the cell?

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alok kumar singh

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Answer-C
Physiological status is one of the factors but not the only factor responsible for oxygen flux. As mentioned in the passage “Both the environment and the physiological status of the body determines how much oxygen is available to cells.”

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Two balls of same mass and carrying equal charge are hung by threads of length $l$ from a fixed support. At electrostatic equilibrium, assuming that angles made by each thread is small, the separation, $x$ between the balls is proportional to:

(a.) $l$

(b.) $l^{2}$

(c.) $l^{2 / 3}$

(d.) $l^{1 / 3}$

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alok kumar singh

Contributor-Level 10

mg In equilibrium, $F_{} = θ$

$= θ$

$θ = \frac{F_{}}{} = \frac{^{2}}{4 π \in_{0}^{2} *}$

also $θ \approx ? = \frac{/ 2}{l}$

Hence, $\frac{}{2 l} = \frac{^{2}}{4 π \in_{0}^{2} *}$

$\Rightarrow^{3} = \frac{2^{2} p}{4 π ε_{0}}$

$= {(\frac{^{2} l}{2 π \in_{0}})}^{1 / 3}$

Therefore $\propto l^{1 / 3}$

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Based on the passage, which of the following best captures the meaning of HIF, or hypoxia-inducible factor?

A. It is a protein that increases inside the cell when the oxygen levels fall, helping the cell survive.
B. It inhibits oxygen carrying process in the body as the oxygen level increases inside the cell.
C. It enables cells to adapt quickly to the changing environment and helps in its survival.
D. It regulates the amount of oxygen available to the cell and the body during exercise.

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Based on the passage, which of the following best captures the meaning of HIF, or hypoxia-inducible factor?

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Based on the passage, which of the following best captures the meaning of HIF, or hypoxia-inducible factor?

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alok kumar singh

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Answer-A
Only first option clearly defines the meaning of HIF, by using the term 'protein'. Option C can be a characteristic but not a complete meaning. The meaning can be derived with the help of the following lines “When oxygen levels decrease, the HIF protein inhibits oxygen-consuming processes of the cells by altering the activity of numerous genes”.

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Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide. Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.

(A) Both A and R are correct and A is the correct explanation of R.

(B) Both A and R are correct but A is not the correct explanation of R.

(C) Both A and R are not correct.

(D) A is not correct but R is correct.

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This is a assertion and reason type question as classified in NCERT Exemplar

(A) Explanation:

Alkaline earth metals are stable at room temperature except beryllium carbonate. It decomposes to give beryllium oxide and carbon dioxide. It is kept in an atmosphere of carbon dioxide so that equilibrium shifts to the right. The reaction is shown below. BeCO₃→ BeO+CO₂

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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): The carbonate of lithium decomposes easily on heating to form lithium oxide and CO₂⋅

Reason (R): Lithium being very small in size polarises large carbonate ion leading to the formation of more stable Li₂O and CO₂.

(A) Both A and R are correct and R is the correct explanation of A.

(B) Both A and R are correct but R is not the correct explanation of A.

(C) Both A and R are not correct.

(D) A is not correct but R is correct.

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This is a assertion and reason type question as classified in NCERT Exemplar

(A) Lithium beimg small in size, polarises large carbonate ion. Polarisation is the distortion of electron cloud of the anion by the cation. Thus, the carbonate of lithium decomposes easily on heating to form lithium oxide and CO₂. The reaction is shown below.

Li₂CO₃→ Li₂O+CO₂

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Match the elements given in Column I with the colour they impart to the flame given in Column II.

Column I	Column II
(i) Cs	(a) Apple green
(ii) Na	(b) Violet
(iii) K	(c) Brick red
(iv) Ca	(d) Yellow
(v) Sr	(e) Crimson red
(vi) Ba	(f) Blue

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This is a matching type question as classified in NCERT Exemplar

(i) → (f); (ii) → (d); (iii) → (b) : (iv) → (c) ; (v) → (e); (vi) → (a)

All alkali metal and alkaline earth metals except beryllium and magnesium gives characteristic color when introduced into flame. Due to released energy being absorbed in the visible region, alkali metals and alkaline earth metals gives characteristic color.

(i) Caesium imparts blue color when introduced into flame.

(ii) Sodium imparts yellow color when introduced into flame.

(iii) Potassium imparts violet color when introduced into flame.

(iv) Calcium imparts brick red color when introduced

...more

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Match the compounds given in Column I with their uses mentioned in Column II.

Column I	Column II
(i) CaCO₃	(a) Density, ornamental work
(ii) Ca(OH)₂	(b) Manufacture of sodium carbonate from caustic soda
(iii) CaO	(c) Manufacture of high quality paper
(iv) CaSO₄	(d) Used in white washing

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This is a matching type question as classified in NCERT Exemplar

(i) → (c); (ii) → (d); (iii) → (b) : (iv) → (a)

(i) CaCO₃ is used in manufacturing of high quality paper.

(ii) Due to the disinfectant nature of Ca (OH)₂ is used in white wash.

(iii) CaO is used in the manufacture of sodium carbonate from caustic soda.

(iv)CaSO₄ is used in dentistry, ornamental work and for making statues.

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In the following questions more than one option of column I and II may be correlated.

1. Match the elements given in Column I with the properties mentioned in Column II.

Column I	Column II
(i) Li	(a) Insoluble sulphate
(ii) Na	(b) Strongest monoclinic base
(iii) Ca	(c) Most negative E^o value among alkali metals
(iv) Ba	(d) Insoluble oxalate
	(e) 6s² outer electronic configuration

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