﻿ Assertion : One mole of NaCl contains 6.023 × 1023 molecule

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# 11.Assertion : One mole of NaCl contains 6.023 $×$ 1023 molecules of sodium chloride.Reason : 58.5 g of NaCl also contains 6.023 x 1023 molecules of NaCl.If both assertion and reason are true and reason is the correct explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false If both assertion and reason are false.

B.

If both assertion and reason are true but reason is not the correct explanation of assertion.

Molar mass of 1mole of NaCl = (23 + 35.5)gm = 58.5 gm

According to mole concept,

1 mole of molecules = Gram molecular mass = 6.023 $×$1023 molecules.

$\therefore$ 58.5 gm of NaCl also contains 6.023 $×$ 1023 molecules of NaCl.

12.

Assertion : For Balmer series of hydrogen spectrum, the value n1 = 2 and n2 = 3, 4, 5... .

Reason : The value of n2 for a line in Balmer series of hydrogen spectrum having the highest wavelength is 6.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

13.

Isopropylbenzene on air oxidation in the presence of dilute acid gives

• C6H5COOH

• C6H5COCH3

• C6H5CHO

• C6H5OH

14.

Lassaigne's test for the detection of nitrogen fails in

• H2N-CO-NHNH2.HCl

• NH2-NH2.HCl

• C6H5-NH-NH2.HCl

• C6H5CONH2

15.

Which of the following is not a greenhouse gas?

• Carbon dioxide

• Water vapours

• Methane

• Oxygen

16.

Which of the following has highest hydration energy?

• MgCl2

• CaCl2

• BaCl2

• SrCl2

17.

Which of the following is aromatic?

18.

Which of the following reactions produces hydrogen?

• Mg + H2O

• H2S2O8 + H2O

• BaO2 + HCl

• Na2O2 + 2HCl

19.

Addition of group-13 elements to intrinsic semiconductors results in

• creation of conduction band slightly above the valence band

• creation of conduction band slightly below the valence band

• creation of valence band slightly above the conduction band.

• overlapping of valence band and conduction band

20.

Which of the following elements will have the highest electron affinity ?

• Chlorine

• Nitrogen

• Phosphorus

• Fluorine