Assignment Details

Some Basic Concepts of Chemistry

Do it ok.

1973 minutes

Feb 01, 10:07 AM

35.0 marks

MCQ

15 questions

Lavkumar

I am like teaching.

Class Details

Hindi Grammar

11 th

Hindi Grammar

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Question Text

Question 1 :
A sample of ammonia has a mass of $51.1g$. How many molecules are in this sample?

Question 3 :
The main constituent of LPG is butane. Then (A) Butane can be liquefied easily under high pressure (B) Butane is liquefied by chemically reacting with ethane and propane.

Question 4 :
The property that we use for classifying things depends on the ___________ of the classification.

Question 5 :
Matter is neither created nor destroyed during any physical or chemical change. This statement is :

Question 6 :
Assertion: When $7.0\ g$ nitrogen and $3.0\ g$ hydrogen are allowed to react to form ammonia as a single product, $10.0\ g$ ammonia is formed . Reason: Chemical reactions follow the law of conservation of mass.

Question 8 :
Barium chloride reacts with sodium sulphate to from Barium sulphate and sodium chloride. Then, according to the law of conservation of mass:

Question 9 :
A sample of calcium carbonate $(CaCO_{3})$ has the following percentage composition: $Ca = 40\%; \ C = 12\%; \ O = 48\%$. If the law of constant proportions is true, then the weight of calcium in $4 g$ of a sample of calcium carbonate from another source will be:

Question 10 :
Chemical compounds are formed to have constant composition irrespective of their

Question 11 :
Statement 1: At the same temperature and pressure, 1 L of hydrogen gas and  1 L of neon gas have the same mass. Statement 2: Equal volumes of ideal gases at the same temperature and pressure contain the same number of moles.

Question 12 :
10 ml of a mixture of $CH_{4}, C_{2}H_{4}$ and $CO_{2}$ were exploded with excess of air. After explosion, there was contraction on cooling of 17 ml and after treatment with KOH, there was further reduction of 14 ml. What is the composition of the mixture?

Question 13 :
Which units of pressure are needed if you are going to use 0.0821 as your ideal gas constant?

Question 14 :
$14$ g of element X combines with $16$ g of oxygen. On the basis of this information, which of the following is a correct statement?

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