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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान इयत्ता ११

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

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प्रश्न

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

पर्याय

  • Be

  • Mg

  • Sr

  • Ba

MCQ
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उत्तर

Be

Explanation:

Due to high ionization enthalpy and small size, Be does not react with hydrogen by direct heating.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 10: The s-block Elements - Multiple Choice Questions (Type - I) [पृष्ठ १२७]

APPEARS IN

एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 11
पाठ 10 The s-block Elements
Multiple Choice Questions (Type - I) | Q 16 | पृष्ठ १२७

संबंधित प्रश्‍न

Why are alkali metals not found in nature?


Explain why alkali and alkaline earth metals cannot be obtained by chemical reduction methods?


Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous?


Write a balanced equation for the reaction between Na2O and CO2.


Which of the following statements is incorrect?


The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?


Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?


The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to ______.


By adding gypsum to cement


Write Lewis strucure of \[\ce{O^{-}2}\] ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?


When a metal of group 1 was dissolved in liquid ammonia, the following observations were obtained:

(i) Blue solution was obtained initially.

(ii) On concentrating the solution, blue colour changed to bronze colour.

How do you account for the blue colour of the solution? Give the name of the product formed on keeping the solution for some time.


Match List-I with List-II.

List-I List-II
(Metal) (Emitted light wavelength (nm))
(a) Li (I) 780.0
(b) Na (II) 455.5
(c) Rb (III) 670.8
(d) Cs (IV) 589.2

Choose the most appropriate answer from the options given below:


Match List-I with List-II.

List-I List-II
(Metal) (Application)
(a) Cs (I) High temperature thermometer
(b) Ga (II) Water repellent sprays
(c) B (III) Photoelectric cells
(d) Si (IV) Bullet proof vest

Choose the most appropriate answer from the options given below:


The correct order of hydration enthapies of alkali metal ions is ______.


Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Lithium salts are hydrated.

Reason (R) : Lithium has higher polarising power than other alkali metal group members.

In the light of the above statements, choose the most appropriate answer from the options given below :


The correct order of conductivity of ions in water is ______.


KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines because it ______.


Alkali metals are powerful reducing agents because ______.


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