🔥🌟 MDCAT/ECAT/FSC/XII Grand Chemistry MCQs Interactive Quiz # 1 🧪💡 | Learn & Practice!

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1️⃣ . The order of reducing power of halide ion is:

a I⁻ > Br⁻ > Cl⁻ >F⁻

b Br⁻ > Cl⁻ > I⁻ > F⁻

c I⁻ > Cl⁻ > F⁻ > Br⁻

d F⁻ > Cl⁻ > > Br⁻ > I⁻

✅ Correct Answer: (a) I⁻ > Br⁻ > Cl⁻ > F⁻
Reducing power of halide ions depends on how easily they can lose electrons (i.e., get oxidized). I⁻ is the weakest oxidizing agent but the strongest reducing agent because iodine is least electronegative and has the largest size → it loses its electron most easily. F⁻ is the strongest oxidizing agent but the weakest reducing agent because fluorine is highly electronegative and very small in size → it holds onto its electron tightly. Therefore, the reducing power decreases in the order: I⁻ > Br⁻ > Cl⁻ >F⁻

2️⃣ These give violet colour to the flame:

a Na⁺

b Ca²⁺

c Sr²⁺

d K⁺

✅ Correct Answer: (d) K⁺
Potassium ions produce a violet flame in flame tests, a key identification method.

3️⃣ The coordination number of [Cr(en)₃]³⁺ is:

a 4

b 3

c 2

d 6

✅ Correct Answer: (d) 6
Each ethylenediamine (en) ligand is bidentate, coordinating through two donor atoms. Three en ligands give a coordination number of 6.

4️⃣ This fertilizer provides Nitrogen and Phosphorus:

a Urea

b Ammonium Nitrate

c Diammonium Phosphate

d Potassium Nitrate

✅ Correct Answer: (c) Diammonium Phosphate
DAP supplies both nitrogen (from NH₄⁺) and phosphorus (from PO₄³⁻), making it a dual-nutrient fertilizer.

5️⃣ This is the hottest part of the atmosphere:

a Thermosphere

b Mesosphere

c Stratosphere

d Troposphere

✅ Correct Answer: (a) Thermosphere
The thermosphere is the hottest layer of the atmosphere because it absorbs high energy solar radiation (X rays and UV rays). Temperatures here can rise above 1500 °C, even though the air is very thin. The troposphere (where we live) is actually the lowest layer and gets colder with altitude, not the hottest.

6️⃣ Cathode in Castner-Kellner Cell is:

a Titanium Blocks

b Carbon rods

c Mercury

d Iron Container

✅ Correct Answer: (c) Mercury
In the Castner-Kellner cell, mercury acts as the cathode and forms an amalgam with sodium.

7️⃣ Diagonal relationship of lithium is with:

a Na

b Ca

c Be

d Mg

✅ Correct Answer: (d) Mg
Diagonal relationships in the periodic table commonly pair Li with Mg (and Be with Al). Li and Mg share similar ionic radii and charge densities, show more covalent character than the rest of their groups, form stable nitrides and oxides, and their salts (e.g., carbonates, nitrates) have comparable thermal behaviors.

8️⃣ This is low quality coal:

a Bituminous

b Lignite

c Anthracite

d Peat

✅ Correct Answer: (d) Peat
Peat is the lowest quality coal because it is the first stage of coal formation compared to other types. It has high moisture content, low carbon percentage, and therefore low calorific value. Coal quality increases as carbon content increases when coal matures: Peat → Lignite → Bituminous → Anthracite. Since peat has the lowest carbon content and highest moisture, it is the lowest-quality and poorest grade coal.

9️⃣ This is used as an ink preservative:

a Benzene

b Toluene

c Phenol

d Acetone

✅ Correct Answer: (c) Phenol
Phenol is antiseptic and prevents microbial growth, making it useful as an ink preservative.

🔟 This one is more acidic:

a Phenol

b Carboxylic acid

c Water

d Alcohol

✅ Correct Answer: (b) Carboxylic acid
Carboxylic acids are more acidic than alcohols, phenols, or water due to resonance stabilization of their conjugate base.

1️⃣1️⃣ This is a meta directing group:

a –OH

b –CN

c –NH₂

d –OR

✅ Correct Answer: (b) –CN → The –CN group is electron-withdrawing and directs incoming electrophiles to the meta position in aromatic substitution.

1️⃣2️⃣ Lucas reagent is a mixture of

a Zn and Hg

b Zn and HCl

c ZnCl₂ and HCl

d NaOH and CaO

✅ Correct Answer: (c) ZnCl₂ and HCl → Lucas reagent is a mixture of zinc chloride (ZnCl₂) and hydrochloric acid (HCl), which is commonly used in organic chemistry to differentiate between primary, secondary, and tertiary alcohols based on their reactivity.

1️⃣3️⃣The hybridization in Carbonyl Carbon of aldehydes and ketones is:

a sp²

b sp

c sp³

d dsp³

✅ Correct Answer: (a) sp² → In aldehydes and ketones, the carbonyl carbon is double-bonded to oxygen, which requires sp² hybridization. This allows the carbon to form three bonds: one with oxygen and two with other atoms/groups.

1️⃣4️⃣ The molecule contains Ketonic group:

a Glucose

b Galactose

c Fructose

d Mannose

✅ Correct Answer: (c) Fructose → Fructose contains a ketonic group (a ketone functional group) at the second carbon, making it a ketose sugar, while glucose, galactose, and mannose are aldoses (containing an aldehyde group).

1️⃣5️⃣Ozone layer is present in:

a Troposphere

b Mesosphere

c Stratosphere

d Thermosphere

✅ Correct Answer: (c) Stratosphere → The ozone layer is located in the stratosphere, where it absorbs most of the Sun's harmful ultraviolet radiation.

1️⃣6️⃣ Carbolic acid contains this functional group:

a-COOH

b-NO₂

c -OH

d-SO₃H

✅ Correct Answer: (c) -OH → Carbolic acid (also known as phenol) contains a hydroxyl group (-OH) attached to an aromatic ring

1️⃣7️⃣ In s-block element, this is from superoxide:

a Na

b Mg

c Cs

d Li

✅ Correct Answer: (c) Cs → The ozone layer is located in the stratosphere, where it absorbs most of the Sun's harmful ultraviolet radiation.

1️⃣8️⃣ The colour of flame produced by Beryllium is

a Red

b No colour

c Silver white

d Deep red

✅ Correct Answer: (b) No colour → Beryllium and Magnesium do not impart any characteristic colour to a flame. This is because their electrons are held very tightly due to small atomic size and high ionization energy.As a result, they are not easily excited to higher energy levels by the flame, so no visible emission colour is produced.👉 Therefore, the flame test for Beryllium shows no colour.

1️⃣9️⃣ The reason that benzene burns with soot is

a Inflammability

b Higher carbon content

c High resonance energy

d Aromaticity

✅ Correct Answer: (b) Higher carbon content →Benzene’s high C:H ratio causes sooty flame.

2️⃣0️⃣ The general formula of nitrides for alkaline earth metals is

a MN₃

b M₂N₃

c M₃N

d M₃N₂

✅ Correct Answer: (d) M₃N₂ → Alkaline earth metals (M²⁺) + N³⁻ → M₃N₂.

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