CHEMISTRY CLASS 10TH MCQS
General Science MCQs Click Here
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
- Show the same general formula as alkynes
- Have carbon-carbon triple bond
- Have carbon-carbon double bond
- Are saturated hydrocarbons
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Explanation
Alkenes are a class of unsaturated hydrocarbons that contain one or more carbon-carbon double bonds (C=C).
This double bond is the defining feature of alkenes.
It makes them more reactive than saturated hydrocarbons (alkanes).
ایسیٹک ایسڈ _____ سے حاصل کیا جاتا ہے؟
- Banana
- Dates
- Garlic
- Vinegar
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Explanation
Acetic acid is the main component of vinegar.
It is a liquid made by fermenting the natural sugars found in fruits, grains, and other food sources.
Vinegar is typically made from apples, grapes, or other fruits, and it contains approximately 4-6% acetic acid by volume.
- Oil
- Paper
- Plastic
- Wood
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Explanation
Polyethene, also known as polyethylene, is a type of plastic.
It is a thermoplastic polymer made from ethylene monomers.
It is commonly used in packaging, plastic bags, and containers.
- Alkynes
- Alcohols
- Phenols
- Carboxylic acids
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Explanation
The functional group -COOH is the carboxyl group, which is a characteristic functional group of carboxylic acids.
Carboxylic acids are a class of organic compounds that contain this group, examples include:
- Formic acid (HCOOH)
- Acetic acid (CH3COOH)
- Citric acid (C6H8O7)
- 2
- 5
- 7
- 9
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Explanation
The prefix "hept" stands for 7 carbon atoms.
This is a Greek prefix used in chemistry to denote the number of carbon atoms in a molecule.
Here are some examples:
- Hex- means 6
- Hept- means 7
- Oct- means 8
- Non- means 9
- Dec- means 10
مندرجہ ذیل میں سے کون سی سیر شدہ ہائیڈرو کاربان ہے؟
- CH3-CH=CH2
- CH3-CH2-CH3
- CH3-C=CH
- CH2=CH-C=CH
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Explanation
CH3-CH2-CH3 is the molecular formula for propane, which is a saturated hydrocarbon (an alkane).
مندرجہ ذیل میں سے کون سی شراب ہے؟
- CH3-CHO
- CH3-CH2-O-CH3
- CH3-OH
- HCOOH
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Explanation
- CH3-OH is the molecular formula for methanol, which is an alcohol.
Key Points:
- CH3-CHO is the molecular formula for acetaldehyde, which is an aldehyde.
- CH3-CH2-O-CH3 is the molecular formula for diethyl ether, which is an ether.
- HCOOH is the molecular formula for formic acid, which is a carboxylic acid.
- CnH2n
- CnH2n+1
- CnH2n+2
- CnH2n-1
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Explanation
- The general formula for alkanes is CnH2n+2, where n is the number of carbon atoms in the molecule.
- This formula represents the saturated hydrocarbons, also known as paraffins.
Key Points:
- CnH2n is the general formula for alkenes
- CnH2n+1 is the general formula for alcohols
وہ مادہ جو تیزاب اور بیس دونوں کے ساتھ رد عمل ظاہر کرتے ہیں ___ کہلاتے ہیں؟
- Conjugate acids
- Conjugate bases
- Amphoteric substances
- Buffers
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Explanation
Amphoteric substances are those that can react with both acids and bases.
They can donate or accept protons (H+ ions), depending on the conditions.
Examples of amphoteric substances include water (H2O), amino acids, and certain metals like zinc and aluminum.
مندرجہ ذیل میں نمک ______ ہے؟
- HCl
- KCl
- HNO3
- H2SO4
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Explanation
KCl (potassium chloride) is a salt.
Specifically a neutral salt formed by the reaction of an acid (HCl) with a base (KOH).
