Question # 1

During combustion analysis, which one is used for absorbing carbon dioxide:

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50% KOH

5% KOH

Mg(ClO4)2

Silica gel

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

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 stoichiometric calculations for a chemical reaction results in

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Actual yield

Percentage yield

Theoretical yield

Selectivity

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

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 molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

Which of the following is not the property of liquid crystal

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anisotropic

isotropic

three dimensional arrangement

fluidity

6Na+ Fe2O3 -------- 3 Na2O+2Fe For above reaction, if you are provided with 230g Na and 320g Fe2O3, then limiting reactant is

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, Na

Na2O

Fe2O3

none of these

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

Styrene has empirical formula CH, and there is 92.2%C and 7.75% hydrogen. If molar mass is 104g mol¯, what will be integral multiple (n) to get molecular formula:

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2

4

6

8

Which of the following is a limitation of balanced chemical equation

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Conditions and rate of reactions

Physical state and mechanism

Reactants and products and their coefficients

Both (a) and (b)

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

Combustion analysis is performed for the determination of

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Molar mass of the compound

Empirical formula of the compound

Structural formula of the substance

Mass of halogens present in organic compounds

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

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H20

C6H6

H₂O₂

NaCl

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

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

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

Moles of protons in 20g of SO3

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10

20

40

80

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