i. Heavy water (D2O) is commonly known as hard water as it contains minerals also.
ii. Hard water is formed when the water has high mineral content such as calcium and magnesium.
Which statements is/are correct?
Question 2
Which of the following statements about Ethanol is correct?
i. Ethanol has antibacterial and antifungal properties.
ii. Gasoline when combined with ethanol forms a very efficient fuel.
iii. Ethanol inhalation has no harmful effects on humans.
iv. Ethanol is a non-polar solvent.
Select the correct answers using the codes given below:
Question 3
The following question consists of two statements, statements 1 and 2. Examine these two statements carefully and select the correct answer using the code given below:
Statement 1: Acid catalysis is used to accelerate the rate of the reaction where a strong proton donor is needed. One such reaction is the Azo Coupling reaction.
Statement 2: Azo coupling is an electrophilic aromatic substitution reaction in which aryldiazonium cation is the electrophile.
Question 4
Match list (I) with the list (II) and select the correct answer using the code given below the lists:
List I. (Theory)
1) Arrhenius acid
2) Bronsted-Lowry acid
3) Arrhenius base
4) Bronsted- Lowry base
List II. (Statements)
a) Acid is a proton donor
b) Base is a proton acceptor
c) Acids produce hydrogen ions in solution.
d) Bases produce hydroxide ions in solution.
Question 5
Fill up the blank:
A micelle is an aggregate of molecules in a _______ solution like those formed by detergents.
Question 6
Choose the option which represents 360g of water correctly.
(i) 20 moles of water (ii) 6.022 × 1023 molecules of water (iii) 1.2044 × 1025 molecules of water (iv) 2 moles of water
Question 7
If the ratio of volumes of nitrogen, Hydrogen and ammonia is 1 : 3: 2. Which law among the following is indicated by these figures?
Question 8
Nitrogen is prepared in chemical laboratory by:
Question 9
Identify the oxidizing agent (oxidant) in the following reactions:
Pb3O4 + 8HCl→3PbCl2 + Cl2 + 4H2O
Question 10
Calcium oxide (60-70%), Silica (20-25%), Alumina (5-10%), Ferric oxide (2-3%) are the main components of:
Question 11
A fine white coloured powder which is either sugar or salt is given to you. How would you identify it without tasting?
Question 12
Silver chloride is always stored in a dark coloured bottle. Identify the correct reason:
Question 13
Choose the most beneficial conditions in terms of farming:
Question 14
Select the correct option among the following:
Question 15
When ethanol burns in air, the products obtained are: