Question

(6)
Chemistry
Section - A
Answer the following as per directed.
(1) Both CO2 and H2 gases are
(A) heavier than air (B) colourless
(C) acidic in nature (D) soluble in water
(2) A solution turns red litmus blue , its PH is likely to be
(A) 1
(B) 4
(C) 5
(D) 10
(3) The second most abundant metal in the earth's crust is
(A) oxygen
(B) silicon
(C) aluminium
(D) iron
(4) Magnesium dissolves in hot water to form
(A) Mgo
(B) Mg(OH)2
(C) MgOH
(D) Mgo. Mg(OH)2
(5) The formula of washing soda is
(A) NaHCO,
(B) Na CO,.H2O
(C) Na2CO3
(D) Na2CO, 10H2O
(6) Rancidity can be prevented by
(A) adding antioxidants (B) storing food away from light
(C) keeping food in refrigerator (D) all of these​

Answer 1

Answer:

1) (d)soluble in water

2)(d) 10

3)(a)oxygen

4)(b)Mg(OH)2

5)(d) Na2CO3. 10 H20

6)(d)all of these