EVERYDAY SCIENCE
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تیار کرنے کے لئے امونیا کے ساتھ ہائیڈروکلورک ایسڈ کا رد عمل ہے؟ ______
Decolorization
White fumes
Bubble
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
When HCl (Hydrochloric acid) reacts with NH₃ (Ammonia) , it forms ammonium chloride (NH₄Cl) as a white solid . This reaction produces dense white fumes due to the formation of NH₄Cl in the air.
Most abundant organic compound
Simplest organic compound
The new organic compound
None of these
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Explanation
Methane (CH₄) is the simplest hydrocarbon. It is consisting of one carbon atom bonded to four hydrogen atoms. It is the primary component of natural gas. It is widely used as a fuel source .
گلیسٹرول کا کیمیائی فارمولا کون سا ہے؟
C₃H₈O₃
C₄H₇OH
C₆H₆O₃
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Glycerol (glycerin) is a triol (three hydroxyl groups, -OH) compound with the molecular formula C₃H₈O₃ . It is a colorless, odorless, and viscous liquid . It is commonly used in pharmaceuticals, cosmetics, and food products.
₂He³
₄Be⁶
₄Be⁵
None of these
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Explanation
Alpha decay reduces both the atomic number by 2 and the mass number by 4 . Carbon-10 (₆C¹⁰ ) undergoes α-decay , emitting a ₂He⁴ particle, leaving behind ₄Be⁶ as the daughter nucleus .
[SbF₆]⁻ + 1H₂F⁺
H₂SbF₆ + 2F₂
SbF₃ + H₂ + 2F₂
None of these
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Explanation
The reaction between HF (hydrofluoric acid) and SbF₅ (antimony pentafluoride) forms the superacid fluoroantimonic acid (HSbF₆) . This reaction leads to the formation of the hexafluoroantimonate ion ([SbF₆]⁻) and the protonated hydrogen fluoride ion (H₂F⁺) .
نامیاتی اضافے کا رد عمل نہیں ہے۔ ______
Dehydration
Hydration
Halogenation
None of these
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Explanation
Dehydration is an elimination reaction , not an addition reaction , as it involves the removal of a water molecule. Hydration, Halogenation, and Hydrohalogenation are all addition reactions , where atoms or groups are added to a molecule.
K1[NO2]^2
K2[NO3][CO]
K1[NO3][NO]
None of these
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Explanation
The rate law depends on the slowest (rate-determining) step, which is 2NO₂ → NO₃ + NO .Since this step involves two NO₂ molecules , the rate law is Rate = K₁[NO₂]²
2.9
4.5
7.2
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Pyruvic acid (CH₃COCOOH) is a weak acid with a pKa of around 2.5 , This meaning it partially ionizes in water. Using the Henderson-Hasselbalch equation, the pH of a 0.1M solution of pyruvic acid is approximately 4.5 .
مندرجہ ذیل سیاروں میں سے کون سا سرخ سیارہ کہلاتا ہے؟
Jupiter
Venus
Mars
Mercury
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Explanation
Mars is referred to as the Red Planet. It has rivers , streams, lakes, and oceans. It has the largest volcano Olympus Mons. It has two moons ; Deimos and Phobos.
زمین کے ماحول (یا ہوا) میں سب سے زیادہ پرچر جز ہے؟
Hydrogen
Oxygen
Nitrogen
Carbon dioxide
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
The most abundant component in Earth's atmosphere is nitrogen , making up about 78% of the air. The second most abundant gas is oxygen , which makes up about 21% of the air. Hydrogen and carbon dioxide are both present in the air, but in much smaller amounts than nitrogen and oxygen.