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5 months ago

Class 11th Systems of Particles and Rotational Motion

Q.6. Let $A = [- 1, 1]$ , Then, discuss whether the following functions defined on $A$ are one-one, onto, or bijective:

(i) $f (x) = \frac{x}{2}$

(ii) $g (x) = | x |$

(iii) $h (x) = x | x |$

(iv) $k (x) = x^{2}$ .

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5 months ago

Class 11th The S-block Elements

A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is

(i) Magnesium nitrate

(ii) Calcium nitrate

(iii) Barium nitrate

(iv) Strontium nitrate

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Payal Gupta

Contributor-Level 10

This is a multiple choice type question as classified in NCERT Exemplar

Correct option (ii)

Alkali and alkaline metals impart characteristic color. Calcium gives brick red color, Strontium gives crimson red color, Barium gives apple green color, and radium gives crimson color. So, the compound is calcium nitrate. On heating calcium nitrate, it gives calcium oxide, nitrogen and nitrogen dioxide gas which is brown in color.

Ca (NO₃)²→CaO+O₂+NO₂↑

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5 months ago

Class 11th The S-block Elements

The formula of soda ash is

(i) Na₂CO₃⋅10H₂O

(ii) Na₂CO₃⋅2H₂O

(iii) Na₂CO₃⋅H₂O

(iv) Na₂CO₃

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Payal Gupta

Contributor-Level 10

This is a multiple choice type question as classified in NCERT Exemplar

Correct option (iv)

Anhydrous sodium carbonate is known as soda ash. The formula of soda ash is Na₂CO₃? It is also known as washing soda.

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5 months ago

Class 11th Systems of Particles and Rotational Motion

Q.6. Let $A = [- 1, 1]$ , Then, discuss whether the following functions defined on $A$ are one-one, onto, or bijective:

(i) $f (x) = \frac{x}{2}$

(ii) $g (x) = | x |$

(iii) $h (x) = x | x |$

(iv) $k (x) = x^{2}$ .

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New answer posted

5 months ago

Class 11th The P Block Elements

Describe the general trends in the following properties of the elements in Groups 13 and 14.

(i) Atomic size

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alok kumar singh

Contributor-Level 10

This is a Long Answers Type Questions as classified in NCERT Exemplar

Grp-13 The atomic size of the boron family follows the irregular trend. Generally, down the group the size increases but Gallium has a smaller atomic radius than Aluminium due to the poor shielding effect of 3d-orbitals.

Order: B

Grp-14 The size of the carbon family is smaller than the modern family and as we move down the group the atomic size increases regularly. The increase in covalent radius from carbon to silicon is prominent while from Silicon to lead a small increase in covalent radius is observed; this is due to the presence of completely filled D and f-orbita

...more

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5 months ago

Class 11th The S-block Elements

Which of the following elements does not form hydride by direct heating with dihydrogen?

(i) Be

(ii) Mg

(iii) Sr

(iv) Ba

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Payal Gupta

Contributor-Level 10

This is a multiple choice type question as classified in NCERT Exemplar

Correct option (i)

Beryllium being least reactive does not form hydride by direct heating with dihydrogen. Also due to its small size and high ionization enthalpy it cannot form hydrides by direct heating.

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5 months ago

Class 11th The S-block Elements

Suspension of slaked lime in water is known as

(i) Lime water

(ii) Quick lime

(iii) Milk of lime

(iv) Aqueous solution of slaked lime

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Payal Gupta

Contributor-Level 10

This is a multiple choice type question as classified in NCERT Exemplar

Correct Option (iii)

Ca (OH)₂ saked lime is only sparingly soluble in water. When CaO is soaked in water, it produces a white suspension, and the reaction is highly exothermic. White suspension is called milk of lime and it is used for white washing.

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5 months ago

Class 11th The S-block Elements

Dead burnt plaster is

(i) CaSO₄

(ii) CaSO₄⋅ $\frac{1}{2}$ H₂O

(iii) CaSO₄⋅H₂O

(iv) CaSO₄⋅2H₂O

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Payal Gupta

Contributor-Level 10

This is a multiple choice type question as classified in NCERT Exemplar

Correct option (i)

An anhydrous calcium sulfate is dead burnt paris. It is known as dead burnt because it does not set like plaster when moistened with water. When gypsum is heated the water of crystallization is lost and an anhydrous calcium sulphate is obtained.

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5 months ago

Class 11th The S-block Elements

By adding gypsum to cement

(i) Setting time of cement becomes less.

(ii) Setting time of cement increases.

(iii) Solour of cement becomes light.

(iv) Shining surface is obtained.

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Payal Gupta

Contributor-Level 10

This is a multiple choice type question as classified in NCERT Exemplar

Correct option (ii)

On adding water to cement it gets harder over a period of time. This is known as setting of cement. Gypsum is added to the cement to slow the setting time of cement which occurs in the presence of water.

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