Chemistry

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Q771: The noble gases so unreactive because of ______?

نوبل گیسیں ______ کی وجہ سے اتنے ناقابل عمل ہیں؟

High Ionization potential

Complete octet

High bond energy

None of these

Q772: Which metal can replace Cr in the formula of Cr₂O₃?

Lead

Aluminum

Copper

None of these

Q773: The least stable carbanion is _____?

کم سے کم مستحکم کاربنین _____ ہے؟

(CH₃)₃C⁻

CH₃⁻

(CH₃)₂C⁻

None of these

Q774: Which one among the pairs cannot be separated by H2S in dilute HCl?

Cu^2+, Zn^2+

Bi^3+, Sn^4+

Al^3+, Hg^2+

None of these

Q775: What is pH of a 1 molar solution of an acid that has a Ka - 10.8?

None of these

Explanation

For a strong acid with a high $K_a$ value (10.8), it fully ionizes in water.

pH is calculated as $pH = -log[H^+]$ , and for a 1 M strong acid, $[H^+] = 10^{-4}$ , so pH = 4.

Q776: Select the correct answer: A closed bottle containing water at 300°C is carried to the moon in a spaceship. If it is placed on the surface of the moon, what will happen to the water as soon as the lid is opened?

It will decompose into H₂ and O₂

Water will boil

Water will freeze

None of these

Q777: In dry cell the electrolyte is a moist paste of ______?

خشک سیل میں الیکٹرولائٹ ______ کا نم پیسٹ ہے؟

NH4Cl and MnO2

NaCl and CuCl2

NH4Cl and ZnCl2

None of these

Q778: Sports drinks contain less than 6% carbohydrates are called:

Hypotonic drinks

Hypertonic drinks

Powerade drinks

Mizone drinks

Q779: Dehydrohalogenation of alkylhalide is carried out in presence of

Alcoholic KOH

Aqueous KOH

Conc. H2SO4

Zn dust

Q780: Coordination number of Na in NaCl is:

«1...76 77 78 79 80...193 »

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Chemistry

Q771: The noble gases so unreactive because of ______?

Explanation

Q772: Which metal can replace Cr in the formula of Cr₂O₃?

Explanation

Q773: The least stable carbanion is _____?

Explanation

Q774: Which one among the pairs cannot be separated by H2S in dilute HCl?

Explanation

Q775: What is pH of a 1 molar solution of an acid that has a Ka - 10.8?

Explanation

Q776: Select the correct answer: A closed bottle containing water at 300°C is carried to the moon in a spaceship. If it is placed on the surface of the moon, what will happen to the water as soon as the lid is opened?

Explanation

Q777: In dry cell the electrolyte is a moist paste of ______?

Explanation

Q778: Sports drinks contain less than 6% carbohydrates are called:

Explanation

Q779: Dehydrohalogenation of alkylhalide is carried out in presence of

Explanation

Q780: Coordination number of Na in NaCl is:

Explanation

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