Properties of Water

Q. Some covalent compounds dissolve in water due to

1. hydrogen bonding
2. dispersion forces
3. dipole-dipole forces

Q.

The liquids boil at lower temperature at high altitude because:

1. Atmospheric pressure is high at high altitude

2. Viscosity of a liquid decreases at high altitude

3. Atmospheric pressure is low at high altitudes

4. Viscosity of a liquid increases at high altitude

Q. 39 No. Of moles of K2Cr2O7 reduced by one mole of Sn2+ ions is ?

Q. At what temperature the average speed of gas molecules will be double that at 27degree celsius

Q.

The pH of a solution is 4.80. What is the concentration of hydroxide ions in this solution?

1. 6.3 x 10^-10 M

2. 4.2 x 10^-9 M

3. 3.6 x 10^-12 M

4. 1.6 x 10^-5 M

Q. which of the following set is not correct 1.SO3, O3, NH4+ all have co ordinate bonds 2.H20, NO2, ClO2- all are V shaped molecules 3.I3-, ICl2-, NO2+ 4.SF4, SiF4, XeF4 are tetrahedral in shape

Q. 0.5 g of fuming H2SO4 (oleum) is diluted with water. This solution is completely neutralised by 26.7 mL of 0.4 N NaOH. Find the percentage of free SO3 in the sample solution.

Q. What is true about ice?

1. Its density is more than water

2. It is a good conductor of heat

3. It is a thermal insulator

4. Its density is less than water

Q. 14. In a regular octahedral molecule MX6 the no. Of X-M-X bonds at 180 degree is

Q. 43. 1.7 g of ammonium salt was heated with excess of NaOH. The ammonia released in the process neutralises 100 cc solution of N/5 H2SO4. What is the percentage of ammonia in the salt?

Q. 9. The atomic weights of two elements A and B are 60 and 120 respectively. If X gram of A contains Y atom, then how many atoms are present in 2Xg of B? (1) Y/2 (2) Y (3) Y /4 (4) 2Y

Q. Why axial bond pairs suffer more repulsive interaction from the equatorial bond pairs

Q. The no of Oh- ions in 1 ml of solution having ph= 4

Q. Hydrogen can be obtained from water, by the action of water on

1. Calcium carbide

2. Calcium hydride

3. Calcium oxide

4. Calcium

Q. 7. The dissociation of H2O into H and OH ions is endothermic. The H+ ion concentration on increasing temperature(a) increases b) decreases (c) becomes half(d) r emains same

Q. Correct order of stability of No2, No2-, No2+

Q. A cubic crystal is made of particles A B and C If A is present at the corners of cube B occupies all those face centres which are not opposite to each other while C occupies rest of the face centres as well as alternat edge centres then the formula of crystal will b

Q. which group of atoms have nearly same atomic radius 1.Na, K, Rb, Cs 2.Li, Be, B, C 3.Fe, Co, Ni 4.F, Cl, Br,

Q. an element reacts with hydrogen to form a compound X which on treatement with water liberates hydrogen gas.the element can

Q. Choose the given reaction(s) in which water act as an oxidising agent.

1. $Mg+2H_{2}O\to Mg(OH{)}_2+H_2$
2. $Ca{H}_2+2H_{2}O\to Ca(OH{)}_2+2H_2$
3. $2F_2+2H_{2}O\to 4HF+O_2$
4. $2Na+2H_{2}O\to 2NaOH+H_2$

Q. A and B are two wires. The radius of A is twice that of B. they are stretched by the same load. Then the stress on B is

1. Equal to that on A
2. Four times that on A
3. Two times that on A
4. Half that on A

Q. CCH3COOH(l)+C2H5OH(l) = CH3COOH(l)+ H2O(l) What is the equilibrium constant??

Q. 53 A solution of an acid has pH =4.70.find out the number of OH- ions (pKw=14)

Q. At its melting point, ice is lighter than water because:

1. $H_{2}O$ molecules are more closely packed in the solid state.
2. Ice crystals have a hollow hexagonal arrangement of $H_{2}O$ molecules.
3. On melting of ice, the $H_{2}O$ molecules shrink in size.
4. Ice forms mostly heavy water on melting

Q. An unknown compound contains 8% sulphar by:mass, the least molecular weight, and molecularweight if one molecule contains 4 atoms of "S"

Q. 15. Compare x and y bond angles in the following molecule :- 1. x>y 2. y>x 3. x=y 4. none

Q.

A 10 ml sample of hydroxylamine (NH2OH) aqueous solution is diluted to 50 ml. This diluted solution was completely reacted with 0.01 moles of Fe3+ ions as per following reaction : 2NH2OH+ 4Fe + →N2O +H2O + 4Fe2+ + 4H+ If molarity of original hydroxylamine solution is x, find the value of 100x.

Q.

The molarity of pure water at $4^{\circ }C$ is

1. 1 M

2. 2.5 M

3. 5 M

4. 55.5 M

Q. Some covalent compounds dissolve in water due to

1. hydrogen bonding
2. dispersion forces
3. dipole-dipole forces

Q. Match the following hydrates with the type of water involved.

1. Co-ordinated water
2. Hydrogen bond water
3. Interstitial water