Question 2 :
Three cations $$A, B, C$$ are allowed to react with ammonium hydroxide solution. $$A$$ and $$B$$ produce a dirty green precipitate and a reddish brown precipitate respectively, both of which do not dissolve on further addition of $${NH}_{4}OH$$. $$C$$ gives pale blue colour precipitate with less amount of ammonium hydroxide and on further addition of $${NH}_{4}OH$$, precipitate becomes soluble and deep blue colour solution is formed:
Question 3 :
Which of the following is an example of the exothermic reaction ?
Question 4 :
A less reactive metal replaces a more reactive metal from its salt solution in water.<br>
Question 5 :
Reaction of iron nails with copper sulphate solution is an example of ____________.
Question 6 :
Give an example of each of the following chemical changes: An endothermic reaction <br/>
Question 10 :
A chemistry student is attempting to decompose hydrogen peroxide as follows:<br>$$H_{2}O_{2(g)} \rightarrow H_{2(g)} + O_{2(g)}$$<br>What can the chemistry student do to increase the rate of decomposition?
Question 14 :
Coulomb's law is used to calculate the energy of an ion pair.
Question 16 :
A small piece of silver is placed in a solution containingboth magnesium nitrate and copper (II) nitrate. Whichone of the following occurs?
Question 17 :
The process of zinc plating on iron sheet is known as _______.
Question 20 :
Which of the following process is used in the extractive metallurgy of magnesium ?
Question 24 :
Which of the following is a correct statement about metallic atoms?
Question 25 :
Which of the following set of elements is written in order of theirincreasing metallic character?<br>
Question 26 :
Metals can produce sound when struck, this property of metals is known as sonority.
Question 27 :
The density of solid argon is 1.65 g per cc at $$-233^o C$$. If the argon atom is assumed to be a sphere of radius $$1.54 \times 10^{-8}\, cm$$, the percentage of empty space in solid argon is:
Question 28 :
Fill in the blanks with the appropriate words in each case<br/>Element 'Z' in a sub-group 2[II A] is below element 'Y' in the same sub-group.The element 'Z' will be expected to have___ atomic size and ___metallic character than y.
Question 29 :
With reference only to the periodic table, indicate which of the atom among Bi, S, Ba, As and Ca is most non-metallic?
Question 31 :
Point out the wrong statement:<br>On moving horizontally from left to right across a period in the periodic table
Question 32 :
Which of the following choices both show the correct order of elements by increasing atomic radius AND by increasing ionization energy?
Question 33 :
$$p{ K }_{ a }$$ values of four acids are given below at $${ 25 }^{ o }C$$. The strongest acid is:
Question 38 :
$$10\ mL$$ of a strong acid solution of $$pH=2$$ are mixed with $$990\ mL$$ of another acid solution of $$pH=4$$. The $$pH$$ of the following solution will be:
Question 40 :
In Solvay ammonia process, sodium bicarbonate is precipitated due to :
Question 41 :
What is the minimum $$pH$$ when $$Fe(OH)_3$$ starts precipitating from a solution contain $$0.1M\ FeCl_3$$? $$K_{sp}$$ $$Fe(OH)_3 = 8\times 10^{-13}M^3$$
Question 42 :
Which of the following salts does not contain water of crystallisation?<br>
Question 43 :
When ethyl alcohol is heated with a paste of bleaching powder, we get a compound in which the function of bleaching powder is: 
Question 44 :
One mole of ammonia was completely absorbed in one litre solution each of<br/>I. $$1\ M\ HCl$$<br/>II. $$1 \ M\ CH_3COOH$$ <br/>III. $$1\ M\ H_2SO_4$$ at $$298$$ K<br/>The decreasing order for the $$pH$$ of the resulting solution is:(Given: $$K_b (NH_3) = 4.74$$)
Question 47 :
Which of the following reagent reacts with ethanoic acid to liberate hydrogen gas?<br/>
Question 48 :
When 2 hydrogen atoms combine to form $$H_2$$ molecule, the system ______ .
Question 50 :
Which of the following reactions does not show the correct products of the reaction?
Question 51 :
The general molecular formula, which represents the homologous series of alkanols is :
Question 54 :
$$CH_3 - CH = CH_2 \xrightarrow[\Delta]{Br_2} \quad \xrightarrow[Dryether]{Mg} \quad \xrightarrow[NH_4Cl]{CH_3-\overset{O}{\overset{||}{C}}-CH_3} \quad \xrightarrow[\Delta]{H^+} \begin{matrix} \bigotimes \\(Major)\end{matrix}$$End product of above reaction is:
Question 55 :
Which gas is produced when compound $$X$$ reacts with washing soda?
Question 56 :
The complex ion in the compound $$\displaystyle Cs\left [ MnF_{4}\left ( H_{2}O \right )_{2} \right ]$$ is octahedral and high spin. The name of the compound is :
Question 57 :
Which is the best way of synthesizing $$\displaystyle CH_{3}-C\equiv C-C\equiv C-CH_{3}$$ starting from propyne?<br>
Question 59 :
Select the correct I.U.P.A.C name for $$[Ti (\pi - C_5H_5)_2(\sigma - C_5H_5)_2]$$.<br/>
