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The compounds formed when metals react with non-metals are:

The number of molecules present in 200 g of baking soda is:

If chlorine, bromine and iodine form a Dobereiner's triad and the atomic masses of chlorine and iodine are 35.5 u and 127.0 u respectively, then the atomic mass of bromine is _____.

The values of electronegativity of atoms A and B are 1.20 and 4.0 respectively. The percentage of ionic character of A - B bond is

All the X are Y but all Y are not X. What are X and Y?

Give the IUPAC name of the following compound.

${\text{CH}}_2=\text{CH}-{\text{CH(CH}}_3{)}_2$

Choose the nonmetallic oxides from the following:

Identify the compound which on reacting with sulphuric acid produces a gas that turns lime water milky.

The IUPAC name of the given compound is

What is the common name for methanoic acid (HCOOH) ?

According to modern periodic law, the properties of elements are a periodic function of their ___ .

Dilute solution of ammonium hydroxide is added to aqueous solution of ferrous sulphate and ferrous hydroxide is formed. What type of reaction is this? Write chemical equation.[2 MARKS]

We do not clean ponds or lakes but an aquarium needs to be cleaned periodically. Why?

The correct statement(s) about $O_3$ is(are):

Which of the following is treated with chlorine to obtain bleaching powder ?

(a) $CaS{O}_4$

(b) $Ca(OH{)}_2$

(c) $Mg(OH{)}_2$

(d) $KOH$

Acidulated water is electrolysed by 1A current for 16 minutes and 5 seconds using inert electrodes. The volume of gases liberated at STP will be:

Why during the preparation of ammonia the flask in which it is being prepared is tilted?

Why the refining of highly reactive metals is not done?

Name an indicator which is red in acid solution but turns blue in basic solution.

What do you observe when blue coloured copper sulphate reacts with ammonium hydroxide?

Some carbon atoms have mass number 12 and some have mass number 14. These atoms of same element of different mass numbers are called __.

(a) Calculate the mass fo ammonia that can be obtained from 21.4 g of $N{H}_{4}Cl$ by the reaction:
$2N{H}_{4}Cl+Ca(OH{)}_2\to CaC{l}_2+2H_{2}O+2N{H}_3$
(b) what will be ht volume of ammonia when measured at STP?

Which of the following is an example of polyatomic molecule?

Which of the following would decrease the rate of a chemical reaction?

At 298 K, the conductivity of a saturated solution of AgCl in water is $2.6\times {10}^{-6}Sc{m}^{-1}$. Its solubility product at 298 K (given : ${\lambda }^{\infty }\left(A{g}^{+}\right)=63.0Sc{m}^{2}mo{l}^{-1},{\lambda }^{\infty }\left(C{l}^{-}\right)=67.0Sc{m}^{2}mo{l}^{-1})$

Name one liquid carbon compound which is begin used as an additive in petrol in some countries.

The maximum number of electrons in d subshell is equal to:

The set representing correct order of first ionization potential is:

Non-degradable and fat soluble pollutant, such as DDT enters the food chain, the pollutant

Write one or two words for each of the following. statements/definitions :

(a) Each level of the food chain where the transfer of energy takes place.

(b) The physical factors like temperature, rainfall, light, soil, air and water of an ecosystem.

(c) Organisms which depend on the producers for food either directly or indirectly.

(d) The physical and biological world where we live in.

(e) The self-contained unit of living things and their non-living environment needing only sunlight for its functioning.

Give the names and formulae of two strong acids and two weak acids.

(a) On what basis did Mendeleev arrange the elements in his periodic table?

(b) On what basis are they arranged now?

Name the various modes of waste disposal.

Caprolactam is the monomer of

Out of the first 20 elements in the modern periodic table which are metals?

What is metallic lustre? Give two examples. [2 MARKS]

What is basic anhydride??

While cooking heat is produced also so why it is endo thermic reaction???

Arrange the following electrolytes in the decreasing order of the degree of dissociation.

Write a short note on hydrocarbons and how they are formed

Which of the following will give addition reactions and why ?
$C_4{H}_{10},C_2{H}_6,C_2{H}_4,C{H}_4,C_3{H}_8,C_3{H}_4$

The volume of a given mass of a gas is 100ml at ${100}^{\circ }$C. If pressure is kept constant at what temperature will the sample have the volume of 200ml?