The question asks to identify a polyatomic atom from the given options. To answer this, we need to understand the definitions of monatomic, diatomic, and polyatomic substances and then classify each option accordingly.
Correct Option: D) Sulphur
The question asks to identify the winner of a specific science competition in May 2018 for work on pesticide biodegradation. This requires knowledge of current affairs and significant achievements in science competitions during that period.
A) Prashant Ranganathan is the correct answer. In May 2018, he won the 'Environmental Engineering' category at the Intel International Science and Engineering Fair (Intel ISEF) for his innovative work on the biodegradation of pesticides, specifically focusing on developing a cost-effective method to clean up pesticide-contaminated water.
The question describes a chemical reaction where a substance reacts in the presence of an acid or base to produce alcohol and carboxylic acid. This reaction is characteristic of the hydrolysis of esters, which is the reverse of esterification.
C) Esters undergo hydrolysis in the presence of an acid or a base to yield an alcohol and a carboxylic acid. This reaction is represented as:
\[ \text{Ester} + \text{Water} \xrightarrow{\text{Acid/Base catalyst}} \text{Alcohol} + \text{Carboxylic Acid} \]For example, the hydrolysis of ethyl acetate:
\[ \text{CH}_3\text{COOCH}_2\text{CH}_3 + \text{H}_2\text{O} \xrightarrow{\text{H}^+ \text{ or OH}^-} \text{CH}_3\text{COOH} + \text{CH}_3\text{CH}_2\text{OH} \]Here, ethyl acetate (an ester) reacts with water in the presence of an acid or base to form acetic acid (a carboxylic acid) and ethanol (an alcohol).
The problem asks us to evaluate two actions based on a given statement and determine which action logically follows the statement. We need to analyze the core message of the statement and see if the actions are direct and reasonable consequences or implications.
A) Only 2 follows the statement. Action 2 accurately reflects the rationale behind involving retired professors, which is to leverage their experience for college development.
The question asks to identify the winner of the Santosh Trophy football tournament in 2017. This requires knowledge of specific sports event outcomes.
Correct Option: C) West Bengal won the Santosh Trophy in 2017 by defeating Goa in the final.
The question asks to identify which statement is NOT one of the Four Noble Truths of Lord Buddha. To answer this, one must have a clear understanding of the Four Noble Truths.
Correct Option: C) If desires are not relieved, then misery can be avoided.
This statement is incorrect because it misrepresents the Third Noble Truth. The Third Noble Truth states that suffering (misery) ceases when desires are eliminated, not that it can be avoided if desires are not relieved. If desires are not relieved, suffering persists.
An object of mass 10 kg is moving with a uniform velocity of 5 ms-1. How much kinetic energy has that object held?
To find the kinetic energy of an object, we use the formula for kinetic energy, which depends on the object's mass and velocity. We will substitute the given values into this formula and calculate the result.
The kinetic energy (\(KE\)) of an object is given by the formula:
\[ KE = \frac{1}{2}mv^2 \]The unit of kinetic energy is Joules (J).
Correct Option: B) 125 J
This problem involves setting up and solving a system of linear equations based on the given age relationships at different points in time. We will define variables for the current ages of the man and his son, then translate the past and future age conditions into equations. Finally, we will solve for their current ages and calculate the man's age two years ago.
C) The man's age two years ago was 38 years, and the son's age two years ago was 8 years. This matches our calculated values.
To identify the electronic configuration of a metal, we need to understand the general characteristics of metals based on their valence electrons. Metals typically have 1, 2, or 3 valence electrons, which they tend to lose to achieve a stable octet configuration, forming positive ions (cations).
A) 2, 8, 3. This configuration indicates 3 valence electrons. Elements with 1, 2, or 3 valence electrons are generally metals, as they tend to lose these electrons to achieve a stable electron configuration, forming positive ions.
The mirror image of the below figure with respect to the line AB is
To find the mirror image of a figure with respect to a line, we need to reflect each element of the figure across the line. The line AB acts as the mirror, and every point in the figure is flipped over this line.
Correct Option: D) The arrows and kite-like shape are correctly reflected across the line AB.
