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Why is vinyl alcohol not polymerized to give Poly vinyl alcohol?
A bar tender replaces some quantity of alcohol having 40% concentration with water and thus the concentration of alcohol changes to 30%. If the alcohol which he replaced is mixed with another sample of 260 ml alcohol having 20% concentration, then a mixture having 27% concentration of alcohol is prepared. Find the initial quantity of alcohol having 40% concentration.
Consider the following statements for Poly-Si deposition: 1. Poly-Si layer is used for gate electrode of MOSFET because it has similar lattice constants with SiO2. 2. Poly-Si layer used for gate electrode of MOSFET for the better mechanical stability due to different thermal expansion coefficients. 3. In VLSI circuits, interconnects can be completed in one or two metal levels. 4. Poly-Si is used for short interconnects. Which of the above statements are correct ?
A diluted alcohol contains 16L of alcohol and rest is water. A new mixture in which the concentration of alcohol is 30% is to be prepared by replacing diluted alcohol. How many litres of the mixture shall be replaced with pure alcohol if there was initially 64L of water in the mixture.
Which of the following statements is incorrect regarding preparation of alcohols? give primary alcohol and secondary alcohol respectively b) Ketones on reaction with Grignard’s reagent gives tertiary alcohol c) Aldehydes on reaction with Grignard’s reagent gives primary or secondary alcohol d) Alkyl halides on reaction alcoholic potash gives alcohol
Poly vinyl chloride is produced by the free radical chain polymerisation of the vinyl chloride in presence of the benzoyl peroxide.
Two cans of equal volume contains mixture of alcohol and water. In first can, the ratio between the alcohol and water is 3 ∶ 7 and in second can, the ratio between the alcohol and water is 2 ∶ 3. When two cans mixed together, find the ratio of alcohol and water in mixture.
When a 30% concentration of alcohol is mixed with an 80% concentration of alcohol we get a mixture of 50% concentration of alcohol. In what ratio were these two different concentrations of alcohol mixed?
When 1-liter alcohol is added to the 20-liter mixture of alcohol and water, the quantity of alcohol becomes 50% less than that of water in the mixture. Find the initial ratio of alcohol and water in the mixture?
The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical order of sentences from among the options. P: We may see alcohol and tobacco advertisements everywhere, on television, in newspaper, on street ads card etc. Q: But we know the truth is alcohol and cigarette are harmful for people’s health and sometimes it may bring bad effects to self-impression. R: Alcohol ads usually create several feints to tell people that alcohol is good for people and induce people to drink. S: On the other hand, the malign influence of advertisements shows smoking as something "cool".