CLASS IX, X , XI , XII , NEET and JEE 1. What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL

(i) 4 mol L–
(ii) 20 mol L–
(iii) 0.2 mol L–1
(iv) 2 mol L–1

... Answer is iii)
0.2 mol L–1

2.If 500 mL of a 5M solution is diluted to 1500 mL, what will be the molarity of the solution obtained?

(i)1.66 M
(ii) 1.86 M.
(iii)2.66 M.
(iv) 0.66 M

... Answer is i)
1.66 M ".

 3 If the concentration of glucose (C6H12O6) in blood is 0.9 g L–1, what will be the molarity of glucose in blood? :

(i) 5.005 M
(ii) 2.00 M
(iii) 1.00 M
(iv) 0.005 M.

... Answer is iv)
. 0.005 M.

4. What will be the molality of the solution containing 18.25 g of HCl gas in 500 g of water? . :

(i) 10 m
(ii) 1 m
(iii) 0. 1 m
(iv) 1.05 m

... Answer is ii)
1 m.

5. One mole of any substance contains 6.022 × 1023 atoms/molecules. Number of molecules of H2SO4 present in 100 mL of 0.02M H2SO4 solution is ______.

(i) 1.044 × 1020 molecules
(ii)6.022 × 1020 molecules
(iii)1.2044 × 1020 molecules
(iv) 12.044 × 1020 molecules

... Answer is iv)
12.044 × 1020 molecules.

6. Calcium phosphate is present in tooth enamel. Its nature is ..

(i)basic
(ii) acidic
(iii) neutral.
(iv) amphoteric.

... Answer is i)
basic.

7.A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

(i) Lemon juice
(ii) Vinegar
(iii)Common salt
(iv) An antacid .

... Answer is iv)
An antacid.

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