Some basic concepts of chemistry ( Class XI)

Which of the folowing concentration term is affected by temperature

• molarity

• molality

• molefraction

• none of these

Choose the number of atoms present in 1mole of He

• 6.022 X 10¹⁹

• 6.022 X 10²⁰

• 6.022 X 10²¹

• 6.022 X 10²³

Empirical formula of C₆H₁₂O₆ is

• C₆H₁₂O₆

• CH₂O

• C₃H₆O₃

• CHO

How many atoms are present in 46 u of Na

• 46

• 23

• 1

• 2

How many molecules are in 2.00 moles of H₂O?

• 124x10²⁴ molecules of H₂O

• 1.20x10²³ molecules of H₂O

• 1.20x10²⁴ molecules H₂O

• 124

Number of moles of CO₂ present in 22.0g of carbondioxide is

• 2

• 22

• 0.5

• 0.25

What is the unit of mole fraction

• gram

• Mole

• Mol/L

• Unitless

Quantity of carbon dioxide produced by reaction of 48g of Carbon and 1 mol of dioxygen is___________

• 22g

• 11g

• 44g

• 24g

How many grams of solute are dissolved in 125.0 mL of 5.00M NaCl?

• 0.625 g NaCl
• 36.52 g NaCl
• 36.5 g NaCl
• 0.625 mol NaCl

Tags

NGSS.HS-PS1-7

P₄ + 3 O₂ → P₄O₆

What is the limiting reagent if 12 mol of P₄ react with 15 mol of O₂?

• P₄

• O₂

• P₄O₆

• none of the above