Recently Active Class Vii X Chemistry Questions

Which is not related with silk industry sericulture moriculture apiculture reeling Your Answer c Correct Answer d HOW IT IS POSSIBLE WHEN REELING IS RELATED TO SILK INDUSTRY? ...

Q).Oxygen is a).a halogen b).an alkaline earth c).a noble gas d).a nonmetal ...

""""Organic chemistry is the study of carbon compounds (except CO, CO2, carbonates, hydrogencarbonates, carbides and cyanides) obtained from natural sources or synthesized in the laboratories."""""" so, my questn is that...y ...

i know about oxidation number but how can i define it..??????....pllzzz help... ...

Which oxide of a metal gets reduced only by coke and not by H2 gas or Co gas? a. CuO b. PbO c. Fe2O3 d.ZnO ...

What are the products formed when lead nitrate reacts with hydrochloric acid? ...

Why do substances dissolve in water? And how? ...

What is Zone refining? ...

Why is the Central zone of a candle flame luminous? ...

Calorific value is expressed in kJ/g right? ...

Is there a specefic ratio or amount of CO and H2 individually in 1 unit mass of Water gas?? Or is it a mixture? ...

Why is the Electron affinity of chlorine greater than that of Flourine? After all, the L shell of Flourine is meant to have 8 electrons. ...

If positron is present in the nucleus of every substance, everything should have had a positive charge. Why is it not so? ...

is there any liquid non metal that is a good conductor of electricity? ...

How is CO+H2 prodced? ...

In a flame test,can two different colours be observed one after another?Basically, can an electron jump more than once to a higher energy state? ...

ELECTROLYSIS....... while doing electrolysis of copper(2)sulphate using copper electrodes....y does copper frm anode deposit over cathode in an uniform way...???? it may so happen that the copper ions overlap over each other. ...

Although Carbon is a non-metal, but one of its allotrope, Graphite conducts electricity. Why? ...

A sample of chlorine is found to have 75% of 17Cl35 and 25% of 17Cl37. a. Find the average atomic mass of chlorine b. Give the number of neutrons in both the isotopes. ...

4.4 g sample of a compound of oxygen and carbon was found to contain 1.2 g carbon and 3.2 g of oxygen. Calculate the percentage composition of the compound. ...

PERIODIC TABLE WHAT IS ELECTRON AFFINITY? HOW DOES IT CHANGE DOWN THE GROUP AND ALONG A PERIOD IN PERIODIC TABLE? AND WHY? ...

What is the difference between a combustible substance and a supporter of combustion? Thanx in advance... ...

An aqueous solution of salt (A) gives a white precipitate (B) with NaCl solution. The filtrate gives a black precipitate (C) when H2S is passed into it. Compound (B) dissolves in hot water and the solution gives a yellow prec ...

Calculate the mass of magnesium oxide obtained by burning 2.4 g of magnesium. ...

Why do you think ice occupies more volume than the same mass of water? ...

Why do we see the characteristic colour of a metal ion when a salt of that metal ion is introduced in the flame? Why is it that all metal ions do not give the flame test? ...

If you rub a piece of gold, Au, vigorously, you can rub off 2.00 moles of gold atoms in a century. How many minutes are needed to rub off 1.50 micrograms of gold? ...

Which of the following substances is a strong electrolyte? ...

How does bleaching powder bleaches water? ...

Why do you think Pd or Ni can act as a good reducing agent (a good hydrogen donor)? ...