Comprehension
In a colloidal state the particle size of the dispersed phase range between 103 to 106 pm and colloidal sol is heterogenous in nature. Based on the nature of interaction between the dispersed phase and dispersion medium colloidal sol are classified as lyophilic and lyophobic. Stability of sol is due to presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. Based on this answer the following.
Question: 1
Lyophillic sols are more stable than lyophobic sols because
Lyophillic sols are more stable than lyophobic sols because
Updated On: Apr 17, 2024
- The colloidal particles have positive charge
- The colloidal particles have no charge
- The colloidal particles are solvated
- A small amount of electrolyte is added to stabilise
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The Correct Option is C
Solution and Explanation
The correct option is(C):The colloidal particles are solvated
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Question: 2
Bredig's arc method is.
Bredig's arc method is.
Updated On: Apr 17, 2024
- To coagulate colloidal sol
- To prepare colloidal sol
- To purify the colloidal sol
- To prepare the micelles
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The Correct Option is B
Solution and Explanation
The correct option is(B):To prepare colloidal sol
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Question: 3
The formation of micelles takes place.
The formation of micelles takes place.
Updated On: Apr 17, 2024
- Only above a particular temperature and above a particular concentration
- Only below a particular temperature and below a particular concentration
- Only above Kraft temperature and below CMC
- Only below Kraft temperature and above CMC
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The Correct Option is A
Solution and Explanation
The correct option is(A):Only above a particular temperature and above a particular concentration
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Question: 4
The Arseneous sulphide \(As_2S_3\) sol has negative (-) charge. The maximum power to precipiate it is of:
The Arseneous sulphide \(As_2S_3\) sol has negative (-) charge. The maximum power to precipiate it is of:
Updated On: Apr 17, 2024
- \(H_2SO_4\)
- \(Na_3PO_4\)
- \(CaCl_2\)
- \(AlCl_3\)
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The Correct Option is D
Solution and Explanation
The correct option is(D):\(AlCl_3\)
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Question: 5
When KI solution is added to AgNO3 solution such that AgNO3 amount exceeds KI amount.
When KI solution is added to AgNO3 solution such that AgNO3 amount exceeds KI amount.
Updated On: Apr 17, 2024
- The precipitated AgI adsorbs \(I^-\) ions from KI solution and negatively charged colloidal sol result
- The precipitated Agl adsorbs \(Ag^+\) ions from KI solution and positively charged colloidal sol result
- The precipitated KI adsobs \(NO3^-\) ions from \(AgNO_3\) and negative charged colloidal sol results
- No collidal sol. formation takes place
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The Correct Option is B
Solution and Explanation
The correct option is(B):The precipitated Agl adsorbs \(Ag^+\) ions from KI solution and positively charged colloidal sol result
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Top Questions on Reading Comprehension
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THE FAIR ISLE METHOD: Fair Isle knitting is a traditional technique that involves using two or more colours of yarn in a single row to create intricate patterns and designs. This method requires careful tension management to ensure even stitches and prevent puckering. To begin, select your colours and cast on the desired number of stitches. As you knit, alternate between colours every few stitches, carrying the unused yarn along the back of the work. Mastering the Fair Isle technique allows you to create stunning visual effects in garments, accessories, and home textiles.
THE CONTINENTAL STYLE: The Continental knitting style, often referred to as “picking,” involves holding the yarn in the left hand while the right hand manipulates the needles. This method allows for greater speed and efficiency, particularly when working with complex patterns or multiple colours. To practice this style, start by casting on your stitches and using your left hand to tension the yarn. With each stitch, simply “pick” the yarn with your right needle, forming a quick and fluid motion. As you become comfortable with this technique, you may find that your overall knitting speed and comfort improve significantly.
THE SHORT-ROW TECHNIQUE: Short-row knitting is an advanced technique that allows for the creation of shaped garments, such as sleeves and shoulders, without the need for complex shaping. To make a sleeve using this technique, begin by casting on the required number of stitches. Work a portion of the row, then turn your work and return without completing the full row to create the “short rows” that shape the curves of the sleeve. To prevent holes at the turn, wrap the stitch before you turn your work. Repeat this process as needed to achieve the desired shaping and dimension of the sleeve. Once you have shaped the sleeve, you can then sew the side seams to connect the pieces of your garment and finally, complete the edges to ensure a clean finish. This method not only helps shape curves but also adds dimension to your piece, allowing you to enhance fit and style.- AILET BALLB (Hons.) - 2025
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The Story of Coffee
Coffee, a beloved beverage enjoyed by millions around the globe, has a rich and captivating history that spans centuries. The story of coffee begins in the ancient highlands of Ethiopia, where, according to legend, a goat herder named Kaldi discovered the stimulating effects of coffee beans. One day, Kaldi noticed his goats frolicking with unusual energy after eating red berries from a certain tree. Curious, he tried the berries himself and experienced a newfound alertness. This discovery soon spread to monasteries, where monks used it to stay awake during long hours of prayer. From Ethiopia, coffee cultivation and consumption spread to the Arabian Peninsula, particularly in Yemen, where the practice of roasting coffee beans and brewing the drink began to take shape. By the 15th century, coffee had become a popular beverage in the Islamic world, with coffee houses known as ‘qahveh khaneh’ emerging as social hubs for conversation, music, and intellectual exchange. These coffee houses became centers of culture and commerce, influencing the spread of coffee to Turkey and beyond, eventually reaching Europe. In Europe, coffee initially faced resistance from religious authorities who considered it a ‘Muslim drink’ and tried to ban it. However, its popularity persisted, and by the 17th century, coffee houses had sprung up in major European cities, becoming important gathering places for artists, writers, and thinkers. The stimulating effects of coffee were embraced during the Age of Enlightenment, where it was seen as a catalyst for intellectual discussion and innovation. The journey of coffee continued with the establishment of colonial plantations in tropical regions such as the Caribbean, Central and South America, and Southeast Asia. These plantations fuelled the global demand for coffee, transforming it from a regional specialty to a major commodity. The industrial revolution further accelerated coffee production and consumption, leading to innovations in coffee brewing methods and the development of instant coffee. In the modern era, coffee has evolved into a deeply ingrained part of daily life for people worldwide. Its cultural significance spans from the bustling cafes of Paris to the quiet coffee farms of Colombia. Today, coffee remains not only a popular beverage but also a symbol of social interaction, productivity, and enjoyment. Whether sipped slowly over a conversation with friends or grabbed hastily on the way to work, the story of coffee continues to unfold, intertwining with the histories and cultures of countless societies across the globe.- AILET BALLB (Hons.) - 2025
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The intricate world of modern manufacturing is a web of precision and innovation, where even the tiniest components play a pivotal role. One such element, often overlooked but crucial, is the sub-subpart. Whether it’s a carpenter fashioning a bespoke piece of furniture or an automobile engineer designing the next generation of vehicles, the creation of sub-subparts is a fundamental process that demands meticulous craftsmanship and cutting-edge technology. In the realm of woodworking, carpenters frequently work with sub-subparts like dowels, screws, and hinges. These minute components may appear insignificant, yet they determine the structural integrity and functionality of the final product. Crafting a dowel, for instance, begins with selecting the appropriate wood species, followed by precision cutting and shaping. The result is a perfectly cylindrical, sturdy sub-subpart that seamlessly joins two larger pieces of wood. The advent of computer-aided design (CAD) and computer numerical control (CNC) machines has revolutionised this process, enabling carpenters to create sub-subparts with unparalleled precision.
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