List of top Chemistry Questions

Match the complexes with their magnetic nature:

Which of the following compounds shows acidic character?

Which reagent converts an aldehyde into a carboxylic acid?

एक बल्ब 150 watt निर्धारित है और यह 8% ऊर्जा प्रकाश में परिवर्तित करता है। यदि एक फ़ोटॉन की ऊर्जा \( 4.42 \times 10^{-19} \) J हो, तो बल्ब से प्रति सेकंड कितने फ़ोटॉन उत्सर्जित होते हैं?

Assertion (A) : Actinoids show irregularities in their electronic configurations.
Reason (R) : In actinoids 5f, 6d and 7s orbitals are of comparable energies.

Compound ‘X’ with molecular formula \( C_4H_9Br \) reacts with aqueous KOH to give an alcohol. The rate of this reaction depends only on the concentration of compound ‘X’. When an optically active isomer ‘Y’ of the compound ‘X’ was treated with aqueous KOH solution, the rate of reaction was found to be dependent on concentration of compound ‘Y’ and aqueous KOH both.

22(a). Write down the structural formula of both ‘X’ and ‘Y’.

निम्नलिखित दो अभिक्रियाएँ एक ही दुर्गंधयुक्त उत्पाद Z देती हैं।
Reaction 1: C\(_2\)H\(_5\)Cl \(\xrightarrow{X}\) Z
Reaction 2: C\(_2\)H\(_5\)NH\(_2\) \(\xrightarrow{Br_2, NaOH}\) Y \(\xrightarrow{CHCl_3/\text{एथेनॉली } KOH, \Delta}\) Z
X और Z, क्रमशः हैं:

According to the structural constraints of Valence Bond Theory (VBT), which of the following hybridization geometries and magnetic configurations accurately describes the low-spin coordination complex ion \( [\text{Fe}(\text{CN})_6]^{4- \)? (Atomic Number of \( \text{Fe} = 26 \))}

Deficiency of which of the following essential vitamins in the human diet causes a reduction in intestinal calcium absorption, leading to the bone-softening childhood skeletal deformity known as Rickets?

Benzene reacts with a mixture of carbon monoxide (\( \text{CO} \)) and hydrogen chloride (\( \text{HCl} \)) gas in the presence of an anhydrous aluminium chloride (\( \text{AlCl}_3 \)) catalyst to yield Benzaldehyde. This organic transformation is officially known as the:

An organic primary amide is treated with bromine (\( \text{Br}_2 \)) and an aqueous solution of sodium hydroxide (\( \text{NaOH} \)) to yield a primary amine. Which of the following statements correctly describes this transformation (Hofmann Bromamide Degradation)?

Which of the following oxidation state configurations represents the most common, energetically stable, and dominant oxidation state exhibited by nearly all the Lanthanoid elements across the f-block series?

What are the exact constituent monosaccharide units and the specific structural glycosidic linkage present inside a standard molecule of Lactose (Milk Sugar)?

Which of the following coordination complex compounds is officially classified as a 'Heteroleptic Complex'?

When an aqueous solution of an electrolyte is progressively diluted by adding more solvent water, how do its Specific Conductivity (\( \kappa \)) and Molar Conductivity (\( \Lambda_m \)) respond?

Aldehydes and ketones react with semicarbazide (\( \text{NH}_2\text{NHCONH}_2 \)) in a weakly acidic medium to form crystalline semicarbazone derivatives. Which of the three nitrogen atoms in a semicarbazide molecule acts as the primary nucleophilic center during this reaction?

Which of the following liquid mixtures forms an ideal solution that strictly obeys Raoult's Law across the entire concentration range at a constant temperature?

\(10 \text{ g}\) each of \(\text{CH}_4\) and \(\text{O}_2\) are kept in cylinders of same volume under same temperature, give the pressure ratio of two gases:

In a cyclic \(pV\) process forming a square loop from \((p = 1 \text{ atm}, V = 2\text{L})\) to \((p = 3 \text{ atm}, V = 4\text{L})\), then, the net heat absorbed by the gas is: