Assertion : The ratio by volume of gaseous reactants and products is in agreement with their

molar ratio.

Reason : Volume of a gas is inversely proportional to the number of moles of a gas.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false
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Difficulty Level:

Read the following statements (S) and Explanation (E). Choose the correct answers from the codes (1), (2), (3) and (4):

S : ${\mathrm{H}}_{3}{\mathrm{BO}}_{3}$ is monobasic Lewis acid but salt ${\mathrm{Na}}_{3}{\mathrm{BO}}_{3}$ exist.

E : ${\mathrm{H}}_{3}{\mathrm{BO}}_{3}$ reacts with $\mathrm{NaOH}$ to give ${\mathrm{Na}}_{3}{\mathrm{BO}}_{3}$.

1.  S is correct but E is wrong
2.  S is wrong but E is correct
3.  Both S and E are correct and E is correct explanation of S
4.  Both S and E are correct but E is not correct explanation of S

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Difficulty Level:

When $Mn{O}_{2}$ is fused with KOH, a coloured compound is formed, the product and its colour is [IIT Screening 2003]

(1) ${K}_{2}Mn{O}_{4}$, purple green

(2) $KMn{O}_{4}$, purple

(3) $M{n}_{2}{O}_{3}$, brown

(4) $M{n}_{3}{O}_{4}$ black

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Difficulty Level:

In a balanced equation ${H}_{2}S{O}_{4}+x\text{\hspace{0.17em}}HI\to {H}_{2}S+y\text{\hspace{0.17em}}{I}_{2}+z\text{\hspace{0.17em}}{H}_{2}O$, the values of x, y, z are [EAMCET 2003]

(1) x = 3, y = 5, z = 2

(2) x = 4, y = 8, z = 5

(3) x = 8, y = 4, z = 4

(4) x = 5, y = 3, z = 4

Concept Questions :-

Balancing of Equation by Oxidation Number
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Difficulty Level:

The compound ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}$ which shows superconductivity has copper in oxidation state ........ Assume that the rare earth element Yttrium is in its usual +3 oxidation state [IIT 1994]

(1) 3/7

(2) 7/3

(3) 3

(4) 7

Concept Questions :-

Balancing of Equation by Oxidation Number
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Difficulty Level:

One mole of N2H4 loses 10 mole of electrons to form a new compound Y. Assuming that all nitrogen appear in the new compound, what is the oxidation state of N2 in Y ? (There is no change in the oxidation state of hydrogen) [IIT 1981; Pb. PMT 1998]

(1) + 3

(2) – 3

(3) – 1

(4) + 5

Concept Questions :-

Introduction to Redox
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Difficulty Level:

Oxidation number of oxygen in potassium super oxide (KO2) is [UPSEAT 1999, 2002]

(1) – 2

(2) – 1

(3) – 1/2

(4) – 1/4

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Difficulty Level:

In alkaline medium ClO2 oxidize H2O2 in O2 and reduced itself in Cl then how many mole of H2O2 will oxidize by one mole of ClO2

1. 1.0

2. 1.5

3. 2.5

4. 3.5

Concept Questions :-

Balancing of Equation by Ion Exchange Method
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Difficulty Level:

What is the equivalent mass of $I{O}_{4}^{-}$ when it is converted into I2 in acid medium [Kerala PMT 2004]

(1) M/6

(2) M/7

(3) M/5

(4) M/4

Concept Questions :-

Equivalent Weight & Normality
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Difficulty Level:

The equivalent weight of phosphoric acid (H3PO4) in the reaction $NaOH+{H}_{3}P{O}_{4}\to Na{H}_{2}P{O}_{4}+{H}_{2}O$ is [AIIMS 1999]

(1) 25

(2) 49

(3) 59

(4) 98