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Name the substance formed on surface of copper when it reacts with moist carbon dioxide in air write the equation also.

Which of the following shows biggest jump in II and III ionization energy:

The number of electron pairs shared by the two atoms which are bonded by a double bond is___.

Which class of carbon compounds is responsible for the depletion of ozone layer at the higher level of the atmosphere?

Density of metals increases from top to bottom in a group. But we see that potassium has lower density than sodium. Identify the reason-

How does the number of valence electrons vary on moving from left to right :

(i) in the first period of the periodic table ? (ii) in the second period of the periodic table ?

What should be added to

(a) increase the $p^H$ value,

(b) decrease the $p^H$value of a neutral solution

Conc. sulphuric acid is used as a dehydrating agent due to its ___ nature.

Complete the balanced equation

$Cu+2H_{2}S{O}_4\to$ ________ $+S{O}_2+2H_{2}O$

Why do ionic compounds have a high melting point?

Q73. Consider the following statements about E-cigarettes.

1. E-cigarettes are handy battery-powered devices that emit doses of vaporized caffeine.

2. Unlike regular cigarette, e-cigarettes do not produce smoke but produces an aerosol which is inaccurately referred to as vapour.

3. Liquid solution used in E-cigarettes contains propylene glycol and glycerine.

Which of the above statement(s) is/are correct?

What is the common name of water soluble bases ?

Is water that is H2O is a molecule or a compound sir/mam I have lots of confusion is this single question

Even I can't able to find the answer on Google.......so please the whole answer in detail.....!!

If oxygen is considered to contain $O_2$ Molecules, then calculate the number of moles in 200g of Oxygen?

Which of the following metals refined/extracted by electrometallurgy?

(a) Name the three classes in which elements are classified. Which was the first metal used by man?

(b) Name the metal and non-metal present in abundance in the earth crust.

How to memorize the reactivity series easily? Is there any mnemonic for it?

What are the points to consider while writing an accurate chemical equation?

The galvanized article is protected against rusting even if zinc coating is broken.How?

Explain why carbon forms compounds mainly by covalent bond. Explain in brief two main reasons for carbon forming a large number of compounds. Why does carbon form strong bonds with most other elements?

Compared to the rate of inorganic reactions, the rate of organic reactions generally is:

A metal X with dull appearance do not react with water. But it reacts slowly with dilHCl to form its respective salt Z. Find X and Z.

Manganese (IV) oxide, potassium permanganate, potassium dichromate are commonly called as:

Element A is in the $1^{st}$ group of the modern periodic table. The formula of its ion is:

Determine the empirical formula of a compound containing 47.9% potassium, 5.5% beryllium and 46.6% fluorine by mass. (Atomic weight of K = 39, Be = 9, F = 19). Work to one decimal place.

Which of the following elements has the maximum electron affinity?

When decomposed, 36 gm of $H_{2}O$ gives _______ g of hydrogen and ____ g of oxygen.

The formation of the oxide ion requires first an exothermic and then an endothermic step as shown below

(a) $O_g+e^{-}=O_g^{-}△H^{circ}=-142kjmo{l}^{-1}$
(b) $O_g+e^{-}=O_g^{2-}△H^{circ}=844kjmo{l}^{-1}$

This is because

Complete the following reaction that aids in the formation of acid rain.
+ [O] + H2O→H2SO4

Graphite is a good conductor of electricity. Give reason.

Which of the following sets of reactants used for preparation of paracetomol from phenol?

Lewis-Kossel structure of $N_2$ is:

In a sad twist you inherit “only” a copper mine while your siblings inherit gold and diamond mines. On inspection you come to know that your copper mine is fully equipped to extract the metal from the ore and also that it consists only of Chalcopyrite. Finely powdered, pulverized ore is ready to be processed. What would be your next step ?

$NaHC{O}_3$ represents the formula of which one of the following ?

Oleum is a combination of sulphur trioxide and ___ .

Name the enzyme which converts:
(i) milk into curd (yogurt)
(ii) cane sugar into glucose and fructose
(iii) glucose into ethanol.

Hund's Rule states that:

Bakelite is formed by polymerisation between

How many molecules of oxygen are required for complete combustion of 1 mole of acetylene $\left(C_2{H}_2\right)$?

Which of the following is not true for gases:

The property which reappears at regular intervals in the periodic table is called ________.

An element is represented as${}_{20}^{40}\text{X}$. Find the number of valence electrons in it.