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Question 10
The main constituent of biogas is

(a) methane
(b) carbon dioxide
(c) hydrogen
(d) hydrogen sulphide

Question 9

The nitrogen molecules present in air can be converted into nitrates and nitrites by:



(a) a biological process of nitrogen-fixing bacteria present in the soil

(b) a biological process of carbon fixing factor present in the soil

(c) any of the industries manufacturing nitrogenous compounds

(d) the plants used as cereal crops in the field

The number of valence electrons in sulphur are ___ and in $S_8$ each sulphur is bonded to ___ other sulphur atom/atoms.

When gases react, their volumes bear a simple ratio to each other, under the same conditions of temperature and pressure. Who proposed this gas law?

Choose the correct answer from the choices (a), (b), (c) and (d):

(i) The property which is characteristic of an electrovalent compound is that:

(a) it is easily vaporized

(b) it has a high melting point

(c) it is a weak electrolyte

(d) it often exists as a liquid.



(ii) When a metal atom becomes an ion:

(a) it loses electrons and is oxidised

(b) it gains electrons and is reduced

(c) it gains electrons and is oxidised

(d) it loses electrons and is reduced.

What are covalent bonds? Why ae they different from ionic compounds? List their three characteristic properties?

A sodium salt on treatment with $MgC{l}_2$ gives white precipitate only on heating. The anion of sodium salt is:

Which of the following compounds can have a triple bond?
$C_2{H}_4,C_3{H}_4,C_3{H}_6$

The hybridization of $P$ is $P{O}_4^{3-}$ is the same as of:

How will you prove that Hydrochloric acid contains (i) hydrogen (ii) chlorine? Write equations for the reactions.

You enter a laboratory and you are asked to pass a gas through blue litmus solution. How will you be able to tell whether the gas passed in the experiment is hydrogen chloride or ammonia?

1. 22

Differentiate between valency and oxidation state

The orbital diagram in which the Aufbau Principle is violated:

The molecular formula of the given compound is ________.

Find A and B from the following reaction.
$C{H}_{3}C{H}_{2}OH+O_2\to A+B+Heatandlight$

A student added sodium bicarbonate solution to dilute ethanoic acid. He observed that:

(a) How is energy introduced into the ecosystem?

(b) Consider the following food chains :

(i) $Plants\to Mice\to Snakes\to Hawks$

(ii) $Plants\to Mice\to Hawks$

If energy available at the producer level in both the food chains is 100 J, which case will hawk get more energy as food and by how much? Justify your answer.

Brass is an alloy of :

(a) Copper and tin, (b) Copper and zinc,

(c) Zinc and lead, (d) Lead and tin.

From which of the following ores, metals cannot be extracted using calcination process?

Match the zones of blast furnace used in refining of iron with the respective reaction happening in them.

From the given diagram, find the IUPAC name of the compound.

Ammonia is heated with black metallic oxide X to give reddish brown metal Y. What is X and Y?

Distinguish between exothermic and endothermic reaction. Amongst the following reactions, identify the exothermic and endothermic reaction:
(i) Heating coal in the presence of air to form carbon dioxide.
(ii) Heating limestone in lime kiln to form quick lime.

"The 6 properties of the elements are a periodic function of their atomic numbers.” The statement was given by?

Give 2 examples for each

1)Solid Covalent compounds

2)Gaseous Polar Compounds

3)Liquid Non polar Compounds

4) Gaseous Non Polar Compounds

Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which is the best absorbing material for the carbon dioxide?

Statement I: Lithium needs less energy to knock off an electron from its outermost orbit than Helium.
Statement II: Lithium has 1 electron in its outermost orbit which is loosely bound due to the repulsion of the inner orbit electrons and less attraction from the nucleus.