Question # 1

Mg(s) + 2HCI(aq). ------------ MgCl2(aq)+ H2(g)

Given that; Mg=21g and HCI=21g, the excess reactant is

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Mg

HCI

Both are in stoichiometric amounts

None of these

When we dissolve 15.8 g of KMnO4 in 1000g of H20. The solution is

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, 0.1 M

0.1 M

0.2 M

5604 cm3 of H2 gas at STP contains atoms of hydrogen

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6.02×10 (23)

2.6x10(22)

3.01x10(23)

1. 50x 10(23)

The largest number of molecules are present in

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

1 gram formula refers to

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Amount in grams equivalent to 1 mole of a atom

Amount in grams equivalent to 1 mole of a covalent compound

Amount in grams equivalent to 1 mole of a ionic compound

Amount in grams equivalent to 1 mole of an ion

Mass spectrometry is used to determine the

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Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic masses

All of these

The best concentration unit used for K⁺ ions present in potable water is

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ppm

Mole fraction

Molarity

Molality

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

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% W/W

% W/V

% V/V

%V/W

To cook the food at a high mountain is difficult as compared to at sea level. The reason is that:

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the temperature at the top of the mountain is low

the density of water decreases at the mountains

the boiling point of water decreases at the mountain

the hydrogen bonding in water changes with the change of height

Which of the following compound have empirical formula, but no molecular formula

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H20

C6H6

H₂O₂

NaCl

Which of the following contains I mole of the stated particles

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Chlorine molecules in 35.5 g of chlorine gas

Electrons in 1 g of hydrogen gas

Hydrogen ions in 1 dm³ of 1 mol dm¯³ aqueous sulfuric acid

Oxygen atoms in 22.4 dm³ of oxygen gas at STP

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

How many grams of NaOH are present in 250 cm3 of its 0.2M solution

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,4 g

, 0.4 g

, 10 g

, 2 g

Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water

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4x6.022x10ê23

1×6.022x10ê23

2x6.022 x10ê23

2x6.022x10ê22

Atoms having same mass number but different atomic numbers are called.

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Isotopes

isobars

Isotones

isomers

Number of moles present in 0.6 gram of silica is (Atomic mass Si = 28, O=16)

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0.01 mole

0.064 mole

0.044 mole

0.054 mole

Point out that which is not an application of liquid crystals?

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Source of energy

In display of electrical devices

For skin thermography

As temperature sensor

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

What s the boling point of H2O at the peak of Mount Everest?

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101 C°

69°C

100 C°

98° C

In s solution 7.8 g of benzene ( C6H6 ) and 46g of toluene (C6H5CH3) is present. The mole fraction of toluene is

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1/3

1/5

2/3

5/6

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