The half-life of a first order reaction:
(A) depends on the reactant concentration raised to the first power
(B) depends on rate constant
(C) is independent of the reactant concentration
(D) is independent of rate constant
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The reaction of aliphatic and aromatic primary amines with chloroform in the presence of ethanolic potassium hydroxide to produce compound with fouling smell, is known as

The half life for radioactive decay of C-14 is 5730 years.
A sample of tree had only 80% of C-14 left.
Estimate the age of the tree.
(log 5 = 0.698) (log 4 = 0.602)

Identify the product \([\text{B}]\) in the following reaction.
\(\text{CH}_3\text{CH}_2-\text{C} \equiv \text{CH} + \text{HCl} \rightarrow \text{A} \xrightarrow{\text{HI}} [\text{B}]\)

Answer the question on basis of passage given below :
P block elements are placed in groups 13 to 18 of the periodic table. Their valence shell electronic configuration is \(ns^2 np^{1-6}\). Group 16 of the p block elements are known as the group of chalcogens having \(ns^2 np^4\) as their general electronic configuration. They exhibit number of oxidation states but the stability of \(- 2\) oxidation state decreases down the group. They are sometimes also known as group of chalcogens as the name is derived from the Greek word for brass and points to the association of sulphur and its congeners with copper. Their ionisation enthalpy decreases down the group. Oxygen shows anomalous behaviour due to its small size and high electronegativity.
Identify the epsom salt out of the following salts :

Arrange the following in increasing order of their \(pK _a\) values.
(A) o-nitrophenol
(B) m-nitrophenol
(C) Phenol
(D) Ethanol
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Which of the following reagents can bring about the given conversion?
3-Nitrobromobenzene to 3-Nitrobenzoic acid

If the kinetic energy of the particle is increased to 16 times its previous value. The percentage change in de Broglie wavelength of the particle is:

The correct statement regarding a carbonyl compound with hydrogen atom on its alpha carbon is :
A. A carbonyl compound with hydrogen atom on its a-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.
B. A carbonyl compound with hydrogen atom on its a-carbon rapidly equilibrates with its corresponding enol and this process is known as keto enol tautomerism.
C. A carbonyl compound with hydrogen atom on its a-carbon never equilibrates with corresponding enol.
D. A carbonyl compound with hydrogen atom on its a-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.
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A circular loop of conducting wire is placed near a current carrying wire as shown in the figure. Both are in the same plane. If the current flowing through the wire is suddenly increased.

A magnet of magnetic moment \( 50 \hat{i} \text{ A m}^2 \) is placed along the X-axis in a magnetic field \( \vec{B} = (0.5 \hat{i} + 3.0 \hat{j}) \text{ T} \). The torque acting on it is

The reagent involved in Lucas test is

Given below are some stages of human evolution. Arrange them in correct sequence (Past to Recent)
(A) Homo habilis
(B) Homo sapiens
(C) Homo neanderthalensis
(D) Homo erectus
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