CHEM CH 1

The percentage of nitrogen in urea is about

• 46

• 85

• 18

• 28

Number of grams of oxygen in 32.2 g Na₂SO₄.10 H₂O is

• 20.8

• 22.4

• 2.24

• 2.08

250 ml of a sodium carbonate solution contains 2.65 grams of Na₂CO₃. If 10 ml of this solution is diluted to one litre, what is the concentration of the resultait| solution (mol. wt. of Na₂CO₃ = 106)

• 0.1M

• 0.01M

• 0.001M

• 10M

An aqueous solution of 6.3 g of oxalic acid dihydrate is made upto 250 ml. The volume of 0.1 N NaOH required to completely neutralise 10 ml of this solution is

• 40ML

• 10ML

• 20ML

• 30ML

Which has maximum number of atoms?

• 24 g of C (12)

• 56 g of Fe (56)
  

• 27 g of Al (27)

• 108 g of Ag (108)

Select the applications of Dimensional Analysis

(It may have more than 1 answer)

• Check the correctness of mathematical equation

• To derive equation for more than 3 physical quantities

• To derive the relationship between physical quantities

• Conversion of units from one system to another

If the given equation is dimensionally correct, The dimensional formula of a in the equation v= a + bt, where v = velocity and t is time

• LT^-2

• LT

• L⁰T^-1

• LT^-1

The below given distance units are arranged in an order of

nm, mm, dm, m, Km

• Smallest to largest

• Largest to smallest

• Not arranged in any correct order

• None of the mentioned

Convert 50 miles/h into m/s using these relationships

1 mile = 1609.34 meters "

1 hr = 60 minutes

1 minute = 60 seconds

• 22.33 m/s

• 80467 meters

• 13411 m/s

Which one of these options is NOT a fundamental quantity?

• Time

• Electric current

• Energy

• Luminous Intensity