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Which of the following process is used for the manufacture of sulphuric acid?

Hydrogen and oxygen combine in a ratio of 1:8 by mass to form water. What mass of oxygen gas is required to react completely with 3g of hydrogen gas?

An element 'M' has atomic number 12.

(a) Write its electronic configuration.

(b) State the group to which 'M' belongs.

(c) Is 'M' a metal or a non-metal.

(d) Write the formula of its chloride.

Consider a family with exactly three children. Suppose that each child born is equally likely to be a boy or a girl. List the eight elements of the sample space.

(a) Name the most abundant metal in the earth's crust
(b) Name the most abundant non-metal in hte earth's crust.

Which of the following has the electronic configuration $\left[Kr\right]5s^2$?

The products formed when an excess of sodium hydroxide solution is added to zinc sulphate solution are ___ and ___.

An oxide of metal M has 40% by mass of oxygen. Metal M has relative atomic mass of 24g/mol. The empirical formula of the oxide is:

Find the energy liberated in the reaction: ${}^{223}Ra{\to }^{209}Pb{+}^{14}C$
The atomic masses needed are as follows:
$\underset{223.018u}{{}^{223}Ra}$ $\underset{208.981u}{{}^{209}Pb}$ $\underset{14.003u}{{}^{14}C}$

What are the physical properties of salts.

Based on the group valency of elements state the formula for the following giving justification for each:
(i) Oxides of $1^{st}$ group elements.
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with, an element of group 16

If an element with atomic number 'X' is an inert gas, then in which group would you like to place an element with atomic number (X + 1) in the Modern Periodic Table.

${CO}_2$ + NaOH $H_{2}O$ + X:

Identify X?

What are the horizontal rows in the modern periodic table called?

If the symbol for Cobalt, Co, were written as CO, what would be wrong with it?

Which of the following orbitals are not possible?

The ratio of concentrated hydrochloric acid and concentrated nitric acid in aqua regia is:

State any five physical properties of metals and five physical properties of non-metals.

List some of the advantages of the modern periodic table.

Mercury + sulphuric acid $\to$ No reaction. This is because of:-

(a) Name and state the law given by Lindeman which tell us how much energy entering a particular trophic level of organisms is available for transfer to the next higher trophic level.

(b) How much energy will be available to hawks in the food chain comprising hawk, snake, paddy and mice, if 10,000 J of energy is available to paddy from the sun?

(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.

(b) What happens when carbon dioxide gas is passed through lime water :

(i) for a short time?

(ii) for a considerable time?

Write equations of the reactions involved.

(a) Why is it wrong to treat a bee sting with vinegar?

(b) Why is it wrong to treat a wasp sting with baking soda solution?

Among the following, which surfactant will form micelles in aqueous solution at the lowest molar concentration at ambient conditions?

[IIT-JEE, 2008]

Write the chemical formula of the simplest hydrocarbon.

An ionic salt exhibits colour only when _______.

Write two applications of electrolysis in which the anode diminishes in mass.

Which of the following statement is correct regarding covalent radius and van der Waals radius?

How do alcohols differ structurally from alkanes?

Which of the following is the correct representation of $O_2$?

Anima has two test tubes, one contains a solution of $HCl$ and the other one has a solution of $NaOH$. Then –
a) i) Which solution has lesser concentration of $H^{+}$?
ii) Which solution will turn blue litmus red?
b) What happens when both the solution are mixed? Write a balanced equation of the reaction.

Name the indicator which can give us an idea of how strong or weak an acid or base is.

The number of carbon compounds is very large because:

Among the following reactions, which one occurs at the cathode in the Hall–Héroult process?

Calculate the volume fo HCL gas formed and chlorine gas required when 40 mL of methane reacts completely with chlorine at STP.
$C{H}_4+2C{l}_2\to C{H}_{2}C{l}_2+2HCl$

The colour of blue litmus will turn red in:

Wasp sting is

What is the gas pressure within a cylinder if there is 5.0g of $C{O}_2$ gas in a 10L cylinder at ${25}^{0}C$ inside it.

The electrons are identified by quantum number n and l. Place them in increasing order of energy:
(i) n = 4, l = 1
(ii) n = 4, l = 0
(iii) n = 3, l = 2
(iv) n = 3, l = 1