Recent questions tagged cbsc

Graphite differs from Diamond because graphite is:

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Mineral acids are stronger acids than carboxylic acids because i. mineral acids are completely ionized ii. carboxylic acids are completely ionized iii. mineral acids are partially ionized iv. carboxylic acids are partially ionized

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Element X forms a chloride with the formula XCl2 , which is a solid with a high melting point . x would most likely be in the same group of the periodic table as

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Naturally occurring metallic compounds are called

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What is the Name of Scientist, who stated that matter can be converted into energy

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When ozone absorbs UV radiation, energy is converted in to

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Which of the following is used for dissolution of gold?

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What among following is used to produce artificial rain ?

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Identify the wrong statement in the following

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Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?

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The microorganisms present in the soil require moisture (water) and nutrients for growth and survival. Choose from the options below the habitat (place) where the soil has plenty of water and nutrients.

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The main buffer system of the human blood is

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What kind of element would you find on the far left-hand side of the periodic table?

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The maximum and minimum temperature displayed daily in the weather bulletin refer to the-

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Which one of the following depicts the correct representation of atomic radius(r) of an atom ?

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Vinegar is a solution of

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Read carefully the terms given below. Which f the following set is the correct combination of organs that do not carry out any digestive functions?

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The manufacture of bread, beer and wine involves alcoholic fermentation of glucose to ethanol by yeast. Which of the following five statements concerning this process are correct? I. Yeast carries out fermentation because yeast cells lack mitochondria. II. For every molecule of ethanol produced, one molecule of co1 evolves. III. For every one molecule of glucose fermented, net two molecules of ATP are generated. I V. More than 80% of the chemical energy of the glucose is released as heat. (V) Glycolysis is an integral part of this fermentation.

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The organism that can prepare their own food are called

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Which of the following is the purest form of water?

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By which Reaction metal is obtained from metal oxide

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Raw materials for production of urea are

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What happens when calcium is treated with water?

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Which has triple bond ?

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Which of these is a mechanical process of treating waste water?

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The type of trees and animals thriving in a forest depends on

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Which of these shows asexual reproduction

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When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water , the reaction $SO_2+2H_2S \to 2H_2O +3S$ Occurs. Here Hydrogen sulphide is acting as

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Identify the substance that needs to be transported to all parts of the body.

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Respiratory organs in insects are

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Chemical weathering is fastest in

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The weather of a place over a long period of time is called

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Red color of tomatoes is due to alkene named

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Layer which protects earth from being hit by meteoroids is

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Which of the following is not the necessary condition for rusting

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Reactions in which reactants react to form products and simultaneously products reverse back in to reactants are called

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Arrange the following elements in the order of their decreasing metallic character: $Na, Si, Cl, Mg, Al$

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Which of the following are correct structural isomers of butane?

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Which of the following metals does not displace $H_2$ gas from dilute $HCl$ or dilute $H_2SO_4$?

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Vitamin which helps in chemical transmission of images from eye to brain is

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Which one of the following metal reacts vigorously with oxygen and water?

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Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same? i. Good thermal conductivity ii. Good electrical conductivity iii. Ductility iv. High melting point

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A student takes some zinc granules in a test tube and adds dil. HCl to it. He would observe that the colour of the zinc granules changes to :

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Reaction of halogens (Group-VII) and alkane (saturated hydrocarbons) in presence of sunlight is an example of

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An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

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When a metal replaces hydrogen atom then compound form is

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When copper oxide is heated with hydrogen, copper metal and water are formed. Which of the following is oxidising agent in this reaction?

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Which of the following actions increases the rate of dissolving?

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Air contains 78 percent nitrogen, 21 percent oxygen, and one percent argon. Which gas is the solvent?

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On increasing temperature of amorphous solid they

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