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The volume of 1 mole of oxygen gas is 22400 mL at 760 mm. Calculate the temperature of the gas(Given $R=0.082L-atmmo{l}^{-1}K-1$)

At room temperature, sodium crystallises in body-centred cubic lattice with $a=4.24\stackrel{\circ }{A}$. Calculate the theoretical density of sodium. (Atomic mass of $Na=23.0g/mol$)



[Given, ${4.24}^3=76.22$]

THe number of molecules in 4.25 g of ammonia is:
(a) $1.0\times {10}^{23}$ (b) $1.5\times {10}^{23}$
(c) $2.0\times {10}^{23}$ (d) $3.5\times {10}^{23}$

Vitamin C $(M=176)$ is a compound of $C,H,O$ found in many natural sources, especially citrus fruits. When a $1.0\text{g}$ sample of vitamin C is placed in a combustion chamber and burned, the following data is obtained.

$\text{Mass of}C{O}_2\text{absorber after combustion}=83.85\text{g}$

$\text{Mass of}C{O}_2\text{absorber before combustion}=82.35\text{g}$

$\text{Mass of}{H}_{2}O\text{absorber after combustion}=37.96\text{g}$

$\text{Mass of}{H}_{2}O\text{absorber before combustion}=37.55\text{g}$

What is the percentage of carbon by weight in vitamin C?

Question 7:

Write the properties of bases.

Question 3

1. 
   

   How do we obtain bleaching powder?

   
   


2. 
   

   Which substance is used in the treatment of water in a swimming pool?

   
   

In $\stackrel{1}{C{H}_2}=\stackrel{2}{C}=\stackrel{3}{CH}-\stackrel{4}{C{H}_3}$ molecule, the hybridization of carbon 1, 2, 3 and 4 respectively are

An atom has the electron structure of 2, 7.

(a) What is the atomic number of this atom?

(b) To which of the following would it be chemically similar?

${}_{7}N{,}_{15}P{,}_{17}Cl{,}_{18}Ar$

(c) Why would you expect it to be similar?

One of the following is an endothermic reaction. This is :

(a) combination of carbon and oxygen to form carbon monoxide

(b) combination of nitrogen and oxygen to form nitrogen monoxide

(c) combination of glucose and oxygen to form carbon dioxide and water

(d) combination of zinc and hydrochloric acid to form zinc chloride and hydrogen

Ethanol can be oxidised to ethanoic acid. Write the equation and name the oxidising agent.

1 mole of anything is equal to ______ in number.

The nature of oxides of the following elements are:

Give an example of isomers shown by triple bond hydrocarbons (alkynes) and write their IUPAC names.

What happens when ammonia is mixed with hydrochloric acid?

Which of the following is the best method to dispose of biological wastes from hospitals?

(a) landfill (b) recycling (c) incineration (d) composting

The reaction in which an atom or a group in a compound is replaced by another atom or a group is known as

Why is bio gas is also termed as gobar gas?

Why sodium is kept in kerosene not in petrol or diseal?

The pH of a solution is 4. Concentration of $O{H}^{–}$ ions in the solution is

(a) What effect does the concentration of $H^{+}$ (aq) ions have on the nature of a solution?

(b) What effect does the concentration of $O{H}^{-}$ ions have on the nature of a solution?

(c) Someone put some universal indicator paper into vinegar. The pH is 3. What does this tell you about the vinegar?

(d) Someone put some universal indicator paper onto wet soap. the pH is 8. What does this tell you about the soap?

(e) State whether a solution is acidic. alkaline or neutral if its pH is :

(i) 9

(ii) 4

(iii) 7

(iv) 1

(v) 10

(vi) 3