Chemistry

Q771: The noble gases so unreactive because of ______?

نوبل گیسیں ______ کی وجہ سے اتنے ناقابل عمل ہیں؟

A. High Ionization potential
B. High bond energy
C. Complete octet
D. None of these

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

A. Lead
B. None of these
C. Aluminum
D. Copper

Q773: The least stable carbanion is _____?

کم سے کم مستحکم کاربنین _____ ہے؟

A. None of these
B. (CH₃)₂C⁻
C. CH₃⁻
D. (CH₃)₃C⁻

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

A. Al^3+, Hg^2+
B. Cu^2+, Zn^2+
C. Bi^3+, Sn^4+
D. None of these

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

A. 4
B. None of these
C. 10
D. 8

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?

A. Water will boil
B. None of these
C. It will decompose into H₂ and O₂
D. Water will freeze

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

خشک سیل میں الیکٹرولائٹ ______ کا نم پیسٹ ہے؟

A. NH4Cl and ZnCl2
B. NaCl and CuCl2
C. NH4Cl and MnO2
D. None of these

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

A. Hypotonic drinks
B. Powerade drinks
C. Mizone drinks
D. Hypertonic drinks

Q779: Dehydrohalogenation of alkylhalide is carried out in presence of

A. Aqueous KOH
B. Alcoholic KOH
C. Conc. H2SO4
D. Zn dust

Q780: Coordination number of Na in NaCl is:

A. 4
B. 2
C. 6
D. 1

✅ Correct: 0 | ❌ Wrong: 0 | 📊 Total Attempted: 0

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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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