Question # 1

When 0.1 g of magnesium is treated with an excess of hydrochloric acid, what volume of gas at room temperature and pressure will be produced

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10 cm³

25 cm³

48 cm³

100 cm³

Hemoglobin is 68000 times heavier than:

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Oxygen atom

Nitrogen atom

Carbon atom

Hydrogen atom

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32 g

3.2 g

5.6 g

9.6 g

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N₂O₄is limiting reactant

N₂H₄is the limiting reactant

Reactants are completely converted to the products

Reactions is reversible

A limiting reactant is the one which

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Is taken in lesser quantity in grams as compared to other reactants

Is taken in lesser quantity in volume as compared to other reactants

Gives the maximum amount of the product which is required

Gives the minimum amount of the product under consideration

The negatively charged particles are called

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Cation

Radical

Anion

Positron

What is the volume in cm³of 3.01 x 10²³molecules of O₂gas at S.T.P

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1000 cm³

11000 cm³

1120 cm³

11200 cm³

When nitrogen is 5.6 grams in NO₂. then number of moles of NO₂is

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0.5

0.4

0.04

0.05

The mass of one mole of proton is

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1.008 g

0.184 g

1.673 g

1.008 mg

Which statement about molecule is incorrect ?

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Molecules of a substance are similar

Hemoglobin is a homo atomic molecules

Oxygen molecule is a macro molecule

It exist independently

A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X?

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SO

SO₂

SO₃

SO₄

The diameter of atoms is of the order:

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2* 10^-5m

2* 10^-10m

2* 10^-2m

2* 10^-3m

A compound having empirical formula C₃H₃O and its molecular mass is 110.02. Its molecular formula is

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C₃H₃O

C₆H₆O₂

C₉H₉O₃

C₃H₆O₂

The volume occupied by 1.4 g of N₂at S.T.P is

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

What is the maximum mass of aluminium which can be obtained from 240g of aluminium oxide Al₂O₃?

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26 g

127 g

51 g

108 g

Isotopes differ in the

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Number of neutrons

Number of protons

Number of electrons

Number of atoms

A compound contains one atom of oxygen and % of O 34.78, then molecular mass of compound is

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46

78

110

180

Which one of the following step is not involved in determination of empirical formula

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Determination % of each element

Determination of gram atom of each element

Determination of isotopes of each element

Determination of atomic ratio of element

A limiting reactant is one which according to the stoichiometric equation

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Has excess mass

Has least mass

Has excess number of moles

Has least number of moles

The value of R(General Gas Constant) is

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8.3134 JK^-1mole^-1

1.987 Cal K^-1Mole^-1

Both a and b

1.987 JK^-1mole^-1

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