Sodium Thiosulphate

Q. What is the oxidation number of phosphorus in $H_4{P}_2{O}_7$?

1. $+5$
2. $-5$
3. $+4$
4. $+3$

Q. Match the compounds given in column I with their uses mentioned in column II.

	Column I		Column II
i)	$CaC{O}_3$	a)	Dentistry, ornamental work
ii)	$Ca(OH{)}_2$	b)	Manufacture of sodium carbonate from caustic soda
iii)	CaO	c)	Manufacture of high-quality paper
iv)	$CaS{O}_4$	d)	Used in white washing

Q. Amongst the given set of reactants, the most appropriate for preparing $2^{\circ }$ amine is______.

1. $2^{\circ }R-Br+NaCN$
   followed by $H_2/Pt$
2. $1^{\circ }R-N{H}_2+RCHO$
   followed by $H_2/Pt$
3. $2^{\circ }R-Br+N{H}_3$
4. $1^{\circ }R-Br\left(2mol\right)+$ potassium phthalimide followed by $H_3{O}^{+}$/heat

Q. What is the oxidation number of $Br$ in $KBr{O}_4$?

1. +6
2. +7
3. +8
4. +5

Q. What is the change in oxidation number of chromium in the following reaction?
${\mathrm{Cr}}_2{O}_3+2\mathrm{Al}\stackrel{\Delta }{\to }{\mathrm{Al}}_2{O}_3+2\mathrm{Cr}$

1. +6 to +3
2. +3 to 0
3. +4 to 0
4. 0 to +6

Q. Benedict's solution and Fehling's solution are similar in which of the following options:

1. Both consist of a solution of $aq.CuS{O}_4$
2. Both contain $NaOH$ and complexing reagent.
3. Both contain $C{u}^{2+}$ ion as the oxidising agent.
4. All of the above

Q. The compound $C_7{H}_8$ undergoes the following reactions :
$C_7{H}_8\underset{3{CI}_2/\Delta }{\overset{}{\to }}A\underset{{Br}_2/Fe}{\overset{}{\to }}B\underset{Zn/HCI}{\overset{}{\to }}C$
The product ${}^{\prime }{C}^{\prime }$ is?

1. $p-$bromotoluene
2. $m-$bromotoluene
3. $3-$bromo$-2,4,6-$trinitrotoluene
4. $o-$bromotoluene

Q.

When it is gently warmed, Sodium thiosulphate pentahydrate loses its water of crystallization. $N{a}_2{S}_2{O}_3.5H_{2}O$ is commonly called __.

Q.

In the given reaction the product formed is

1. 

2. 

3. 

4. 

Q. $A+B+H_{2}O\to \left(N{H}_4\right)HC{O}_{3}N{H}_{4}HC{O}_3+NaCl\to C+N{H}_{4}ClN{H}_{4}Cl+D\to 2N{H}_3+2H_{2}O+CaC{l}_2$
Sum of the atoms present in one molecule of each of $A,B,C\text{and}D$

Q.

In a reaction, 200ml of hydrogen peroxide sample solution (at STP) liberated 3 litres of oxygen. What is the concentration (in % w/v) of the $H_2$$O_2$ in the sample?

1. 3.4%

2. 3.03%

3. 4.5%

4. 10%

Q. Assertion :Oxygen atom in both , $O_2$and $O_3$ has an oxidation number of -2 Reason: Oxygen is assigned an oxidation number -2 in all of its compounds.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

The average oxidation state of Sulphur in Sodium Thiosulphate is +___.

Q. Assertion :To a solution of potassium chromate if a strong acid is added it changes its colour from yellow to orange. Reason: The colour change is due to the oxidation of potassium chromate.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. The compound formed in the borax bead test of $C{u}^{2+}$ ion in oxidising flame is

1. $Cu$
2. $CuBO$
3. $Cu(B{O}_2{)}_2$
4. None of these

Q. Whta is the oxidation number of the central metal atom in the coordination compound $\left[Pt\right(N{H}_3{)}_{3}Cl]Cl$?

1. $-1$
2. $0$
3. $+1$
4. $+2$

Q. The compounds formed when fluorine reacts with cold dil NaOH are

1. NaF, O2F2, H2O

2. NaF, H2O, O2

3. NaF, NaOH, H2O

4. NaF, OF2, H2O

Q. Fluorine exhibits only -1 oxidation state while iodine exhibits oxidation states of -1, + 1, + 3, +5 and + 7. This is due to :

1. flourine being a gas
2. none of the above.
3. available $d$-orbitals in iodine
4. non-availability of $d$-orbitals in iodine

Q. Aqueous solution of $N{a}_2{S}_2{O}_3$ on reaction with $C{l}_2$ water gives :

1. $N{a}_2{S}_4{O}_4$
2. $N{a}_{2}S{O}_4$
3. $N{a}_2{S}_4{O}_6$
4. $NaOH$

Q. Aqueous solution of $N{a}_2{S}_2{O}_3$ on reaction with $C{l}_2$ gives

1. $N{a}_2{S}_4{O}_6$
2. $N{a}_{2}S{O}_4$
3. $NaCl$
4. $NaOH$

Q. In which of the following reaction enamine is formed as major product?

1. 
2. 
3. 
4. 

Q. The products formed when hypo solution reacts with chlorine water are

1. $NaCl+S{O}_2+H_2$
2. $HCl+N{a}_{2}S{O}_4+S$
3. $HCl+N{a}_{2}S+S{O}_2+O_2$
4. $NaCl+H_{2}S{O}_4+S$

Q. Assertion :Solution of $C{O}_3^{2-}$ is alkaline. Reason: $C{O}_3^{2-}$ solution is alkaline due to hydrolysis.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q. Match List-I with List-II.

	List-I Reaction		List-II Catalyst
(A)	$4N{H}_3\left(g\right)+5O_2\left(g\right)\to 4NO\left(g\right)+6H_{2}O\left(g\right)$	(I)	$NO\left(g\right)$
(B)	$N_2\left(g\right)+3H_2\left(g\right)\to 2N{H}_3\left(g\right)$	(II)	$H_{2}S{O}_4\left(l\right)$
(C)	$C_{12}{H}_{22}{O}_{11}\left(aq\right)+H_{2}O\left(l\right)\to \underset{\text{Glucose}}{C_6{H}_{12}{O}_6}+\underset{\text{Fructose}}{C_6{H}_{12}{O}_6}$	(III)	$Pt\left(s\right)$
(D)	$2S{O}_2\left(g\right)+O_2\left(g\right)\to 2S{O}_3\left(g\right)$	(IV)	$Fe\left(s\right)$

Choose the correct answer from the options given below:

Q.

Identify the incorrect statements among the following :

1. Silicon reacts with NaOH in the presence of air to give

2. reacts with excess of to given and HCl

3. Ozone reacts with

4. reacts with hot and strong NaOH solution to give

Q. The oxidation number of Cr in $Cr{O}_5$ is _______

1. +5
2. +6
3. +4
4. +1

Q. The oxidation number of carboxylic carbon atom in $C{H}_{3}COOH$ is

Q. Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.

25 mL of household bleach solution was mixed with 30 mL of 0.50 M KI and 10 mL of 4N acetic acid. In the titration of the liberated iodine, 48 mL of 0.25 N $N{a}_2{S}_2{O}_3$ was used to reach the end point. The molarity of the household bleach solution is

1. 0.48 M
2. 0.96 M
3. 0.24 M
4. 0.024 M

Q. Assertion :The reaction between marble and dilute sulphuric acid stops soon. Reason: This is due to the deposition of insoluble $CaS{O}_4$ on the surface of $CaC{O}_3$

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. When $C{l}_2$ is passed through hot and conc. solution of KOH, following compound is formed

1. 
2. 
3. 
4.