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Will different elements with same valence electrons have same Chemical properties? Why?

a) What is percentage composition of potassium chlorate (KClO₃).

Given:Atomic mass Of K=39,Cl=35.5andO=16

When calcium carbonate reacts with dilute hydrochloric acid, a gas X is formed. When gas X is passed through lime water, it turns milky due to the formation of precipitate Y. So, Y is ____.

Which of the following acid has the highest concentration of ${\text{H}}^{+}$ ions?

A solution turns red litmus blue. Its pH is likely to be :

(a) 1

(b) 4

(c) 5

(d) 10

In organic chemistry how do we get to know the structures of the organic compound. Are the visible to us somehow? If so how?

Match the following.

Relate physical states used in Chemical reaction to their symbols.

$$\begin{array}{cc}PhysicalState& Symbol\\ 1.Gas& \left(A\right)\left(dw\right)\\ 2.Solid& \left(B\right)\left(g\right)\\ 3.Liquid& \left(C\right)\left(aq\right)\\ 4.Dissolvedinwater\left(solutionwithwater\right)& \left(D\right)\left(l\right)\\ & \left(E\right)\left(s\right)\\ & \left(F\right)\left(v\right)\end{array}$$

Vapour density of a gas is 22. Its molecular mass will be:

Why ammonium ion contains a positive charge when hydrogen accepts lone pair of electrons from ammonia and forms coordinate bond .

A non-metal present in stainless steel is __.

(a) With the help of a flow diagram, describe how energy from the sun flows through various trophic levels.

(b) Explain why the flow of energy in the ecosystem is said to be unidirectional.

When a zinc strip is put in copper sulphate solution, after some time, a red brown coating is deposited on the zinc strip. This indicates:

What is the name of this compound?

Question 1:

Write any four physical properties of acid?

______ is obtained by distilling conc. sulphuric acid with potassium nitrate.

The major constituent of natural gas is:

Arrange the following alkanes in increasing order of their boiling points.

In Bayer's process, what is used to convert impure bauxite to pure alumina?

Which of the given chemical reactions is not feasible?

If octane and propane are members of a homologous series, then these two compounds differ by ________.

Name the products formed when :

(a) wood is burnt in the absence of air.

(b) bone is heated in the absence of air.

(c) diamond is burnt in air at 900${}^{\circ }$C.

(d) graphite is subjected to high pressure and 3000${}^{\circ }$ C temperature.

What is the mass of 3 moles of O2?

Consider the following reduction processes:



$Z{n}^{2+}+2e^{-}\to Zn\left(s\right);E^o=-0.76V$

$C{a}^{2+}+2e^{-}\to Ca\left(s\right);E^o=-2.87V$

$M{g}^{2+}+2e^{-}\to Mg\left(s\right);E^o=-2.36V$

$N{i}^{2+}+2e^{-}\to Ni\left(s\right);E^o=-0.25V$



The reducing power of the metals increases in the order:

Among the following which one has the highest cation to anion size ratio?

Alkanes react with an excess of air or oxygen to give :

Question 6

Classify the following changes as physical and chemical changes:

1. 
   

   Melting of wax

   
   


2. 
   

   Burning of wax

   
   


3. 
   

   Burning of paper

   
   


4. 
   

   Breaking of glass

   
   


5. 
   

   Chopping of wood

   
   


6. 
   

   Cooking of food