BITSAT Model Questions

Question

Oxidation state of in Cr(CO)_6 is -

Possible Answers

Selected	Possible Answer
	- 2
	0
	+ 6
	+ 2

Question

Oxidation number of in $[Pt(C_2H_4)Cl_3]^{-}$ is -

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Selected	Possible Answer
	+ 3
	+ 2
	+ 1
	+ 4

Question

The brown ring complex is formulated as [Fe(H_2O)_5NO]SO_4 . The oxidation state of iron is -

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Selected	Possible Answer
	+ 3
	+ 2
	+ 1
	0

Question

The oxidation number of sulphur in S_8 , S_2F_2 , H_2S respectively, are -

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	- 2, + 1 and – 2
	+ 2, +1 and – 2
	0, + 1 and – 2
	0, + 1 and + 2

Question

Which of the following is not a reducing agent -

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Question

Equivalent mass of oxidising agent in the reaction,

$SO_2 + 2H_2S \rightarrow 3S + 2H_2O$ is -

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Selected	Possible Answer
	64
	32
	16
	8

Question

A, B and C are three element forming a part of compound in oxidation states of + 2, + 5 and – 2 respectively. What could be the compound -

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Question

On reduction of KMnO_4 by oxalic acid in acidic medium, the oxidation number of Mn changes. What is the magnitude of this change -

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	From 5 to 2
	From 7 to 2
	From 6 to 2
	From 7 to 4

Question

The oxidation number of iron in Fe_3O_4 is -

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Selected	Possible Answer
	2/3
	8/3
	+ 3
	+ 2

Question

What is oxidation number of in Fe(CO)_5 -

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Selected	Possible Answer
	5
	– 5
	+ 3
	Zero

Question

In H_2O_2 , the oxidation state of oxygen is -

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Selected	Possible Answer
	– 2
	– 1
	0
	4

Question

In the balanced equation -

$5H_2O_2 + XClO_2 + 2OH^{-}$ $\rightarrow XCl^{-} + YO_2 + 6H_2O$

The reaction is balanced if

Possible Answers

Selected	Possible Answer
	X = 5, Y = 2
	X = 4, Y = 10
	X = 5, Y = 5
	X = 2, Y = 5

Question

Best way to prevent rusting of iron is by -

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Selected	Possible Answer
	putting it in saline water
	none of these
	making iron cathode
	both of these

Question

Amongst the following, identify the species with an atom in + 6 oxidation state -

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	$MnO_4 ^{-}$
	$NiF_6 ^{2-}$
	$Cr(CN)_6 ^{3-}$

Question

acts as -

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	acid
	reducing agent
	Both (a) and (b)
	oxidising agent

Question

The reaction,

$3ClO^{-}(aq) \rightarrow$ $CIO_3 ^{-}(aq) + 2Cl^{-} (aq)$
is an example of-

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Selected	Possible Answer
	Reduction reaction
	Decomposition reaction.
	Oxidation reaction
	Disproportionation reaction

Question

In the standardization of Na_2S_2O_3 using K_2Cr_2O_7 by using iodometry, the equivalent weight of is

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Selected	Possible Answer
	(molecular weight) / 2
	(molecular weight) / 3
	(molecular weight) / 6
	same as molecular weight.

Question

The oxidation number of sulphur in Na_2S_4O_6 is -

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Selected	Possible Answer
	2.5
	2
	1.5
	3

Question

Which of the following is a redox reaction -

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Selected	Possible Answer
	$CaC_2O_4 + 2HCl \rightarrow$
	$NaCl + KNO_3 \rightarrow$
	$Mg(OH)_2 + 2NH_4Cl \rightarrow$
	$Zn + 2AgCN \rightarrow$

Question

When KMnO_4 acts as an oxidising agent and ultimately forms $MnO_4 ^{2-}$ , MnO_2 , Mn_2O_3 and $Mn^{2+}$ then the number of electrons transferred in each case respectively is -

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Selected	Possible Answer
	4, 3, 1, 5
	1, 5, 3, 7
	1, 3, 4, 5
	3, 5, 7, 1

Question

Oxidation number of in H_2S_2O_8 is -

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Selected	Possible Answer
	+ 6
	+ 2
	+ 4
	+ 7

Question

Which reaction is not feasible -

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Selected	Possible Answer
	$2KI + Br_2 \rightarrow$
	$2KBr + Cl_2 \rightarrow$
	$2H_2O + 2F_2 \rightarrow$
	$2KBr + I_2 \rightarrow$

Question

The oxidation state of in $[Cr(NH_3)_4Cl_2]^{+}$ is

Possible Answers

Selected	Possible Answer
	+3
	+2
	0
	+1

Question

Oxidation numbers of A, B and C are +6, – 2 and –1, respectively. What will be the formula of the molecule when A, B and C associate with each other ?

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Question

$\rightarrow 3Cu + N_2 + 3H_2O$

In the above conversion, the oxidation number of nitrogen is changing in from

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Selected	Possible Answer
	+5 to 0
	–3 to 0
	0 to +2
	–3 to –5

Question

Oxidation numbers of the two nitrogen atoms present in ammonium nitrate are respectively ?

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Selected	Possible Answer
	–1 and –1
	+3 and +3
	0 and 0
	–3 and +5

Question

In the following reaction, $MnO_4 ^{-1} + 8H^+ + 5e^{-} \rightarrow Mn^{+2} + 4H_2O$ how many grams of KMnO_4 should be taken if its 0.5 litre of 0.2 N solution is to be prepared ?

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Selected	Possible Answer
	63.2 g
	94.8 g
	31.6 g
	158.0 g

Question

What will be the oxidation state of copper in YBa_2Cu_3O_7 , if oxidation state of (Y) is +3 ?

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Selected	Possible Answer
	7
	none of the above
	3 and 5
	7/3

Question

One mole KMnO_4 oxidises how many moles of ferrous oxalate ?

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Selected	Possible Answer
	$\cfrac{1}{5}$
	$\cfrac{2}{3}$
	$\cfrac{5}{3}$
	$\cfrac{1}{3}$

Question

What should be the oxidation number of S in H_2S_2O_7 ?

Possible Answers

Selected	Possible Answer
	+7
	+5
	+6
	+4

Question

Oxidation number of iodine in the following reaction $IO_3 ^{-1} + HI \rightarrow H_2O + I_2$

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Selected	Possible Answer
	decreases
	increases as well as decreases
	neither increases nor decrease
	increases

Question

One mole of X_2H_4 releases 10 moles of electrons to form a compound Y. What should be the oxidation number of X in the compound Y ?

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Selected	Possible Answer
	–3
	+1
	–6
	+3

Question

In the presence of humidity, SO_2

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	is a reductant
	is an oxidant
	loses proton
	accepts electron

Question

How many moles of nitrogen produced by the oxidation of one mole of hydrazine by $\cfrac{2}{3}$ mole bromate ion ?

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Selected	Possible Answer
	$\cfrac{1}{3}$
	$\cfrac{2}{3}$

Question

How many moles of K_2Cr_2O_7 are reduced by 1 mole of formic acid ?

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Selected	Possible Answer
	$\cfrac{1}{3} Mole$

	$\cfrac{5}{3} Mole$
	$\cfrac{2}{3} Mole$

Question

$WO_3 + 8CN^{-} + 2H_2O \rightarrow [W(CN)_8]^{4-}$ $+ 1/2 O_2 + 4OH^{-}$ In the above process, oxidant is -

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Selected	Possible Answer
	$CN^{-}$

Question

How many ml. of 0.1 M oxalic acid solution is required to reduce 0.01 mole KMnO_4 to MnO_2 ?

Possible Answers

Selected	Possible Answer
	150
	250
	100
	500

Question

When one mole $NO_3^{-}$ is converted into 1 mole NO_2 , 0.5 mole. N_2 and 0.5 mole N_2O respectively. It accepts x, y and z mole of electrons –x, y and z are respectively.

Possible Answers

Selected	Possible Answer
	2, 1, 3
	1, 2, 3
	1, 5, 4
	2, 3, 4

Question

An element A in a compound ABD has an oxidation no. $A^{-n}$ . It is oxidised by $Cr_2O_7 ^{-2}$ in acid medium. In an experiment $1.68 * 10^{-3} mole$ of K_2Cr_2O_7

was required for $3.26 * 10^{-3}$ mole of the compound ABD. Calculate new oxidation state of A.

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Question

Find out the value of n in $MnO_4 ^{-} + 8H^+ + ne \rightarrow Mn^{+2} + 4H_2O$

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Selected	Possible Answer
	6
	7
	5
	3

Question

In the reaction $8 Al + 3 Fe_3O_4 \rightarrow 4 Al_2O_3 + 9 Fe$
(a) Which element is oxidised or reduced ?
(b) Total number of electrons transferred during the change.

Possible Answers

Selected	Possible Answer
	24
	25
	26
	27

Question

Reaction between 1 mole of HgCl_2 and 1 mole of SnCl_2 occurs as follows. $2 HgCl_2 + SnCl_2 \rightarrow SnCl_4 + Hg_2Cl_2$ .Which of the following ions will be there after completion of the reaction?

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