List of top Chemistry Questions

What is the number of moles in 18 g of water (\( \text{H}_2\text{O} \))?
Which of the following is an example of a redox reaction?
Arrange the following complexes in the increasing order of their spin only magnetic moment (in B.M)
I. \([Fe(CN)₆]⁴⁻\)
II. \([MnCl₄]²⁻\)
III. \([Mn(CN)₆]³⁻\)
IV. \([Cr(NH₃)₆]³⁺\)
What is the molar mass of \( \text{NaCl} \)?

A first-order reaction is 25% complete in 30 minutes. How much time will it take for the reaction to be 75% complete? 
 

Which of the following is the correct IUPAC name for the compound with the molecular formula \( C_5H_{12} \) that contains a branched chain with a methyl group attached to the second carbon of a butane chain?
Identify the geometry and hybridization of the central atom in SF₄.
The potential of a large liquid drop when eight liquid drops are combined is 20 V. What is the potential of each single drop?
The Gibbs energy change of the reaction (in kJ mol⁻¹) corresponding to the following cell
Cr | Cr³⁺(0.1M) || Fe²⁺(0.01 M) | Fe
(Given: \(E^\circ_{Cr^{3+}/Cr} = -0.75V\); \(E^\circ_{Fe^{2+}/Fe} = -0.45V\), 1F = 96,500 C mol⁻¹)
Calculate the mass in kg of 4.48 dm$^3$ carbon dioxide at STP.
Which of the following molecules has a linear shape?
Which of the following molecules has the highest bond angle?
Which of the following molecules has a trigonal planar shape?
The major product of the following reaction is:
$Ph-C(=O)-CH_2CH_2-CN$
(i) $CH_{3}MgBr (excess) (ii) H_{+}H_{2}O$

Identify the suitable reagent for the following conversion: $Ph-C(=O)-OCH_3$ $\longrightarrow$ $Ph-CHO$

How many products (including stereoisomers) are expected from monochlorination of the following compound?
$CH_3-CH-CH_2-CH_3$

Predict the major product $ P $ in the following sequence of reactions:
(i) HBr, benzoyl peroxide 
(ii) KCN 
(iii) Na(Hg), $C_{2}H_{5}OH$

Which one of the following compounds can exist as cis-trans isomers?
Given below are two statements:
Statement I: Benzendiazonium salt is prepared by the reaction of aniline with nitrous acid at 273-278 K. It decomposes easily in the dry state.
Statement II: Insertion of iodine into the benzene ring is difficult and hence iodobenzene is prepared through the reaction of benzendiazonium salt with KI.
In the light of the above statements, choose the most appropriate answer from the options given below:
The correct order of decreasing basic strength of the given amines is:
Which one of the following compounds does not decolorize bromine water?
Sugar ‘X’:
A. is found in honey.
B. is a keto sugar.
C. exists in $\alpha$ and $\beta$ anomeric forms.
D. is laevorotatory.
‘X’ is:

Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution to 12. The current in Amperes used for the given electrolysis is …..  (Nearest integer).

How many moles are present in \(44\, \text{g}\) of \(CO_2\)?
(Molar mass of \(CO_2 = 44\, \text{g/mol}\))

Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula $C_{4}H_{8}O$ is: