Question

127 Which of the following is not a endothermic reaction?
(a) Cacoa
CaO + Cog
(b) 2.0
2H+
(c) 6CO, + 6H2O
- CH₂O + 602
Oo +
(d) C H206 +60
6CO2 +6H,O
[3] A salt where aqueous solution will have a pH of more than 7 will be
(a)K.CO
(c) K SO,
(6) NaCl
(d) NHACI
14) An acidic oxide is formed by the following element.
(a) Na
(c) C
(b) Ca
(d) H
[5] Which of the following non-metal is liquid at room temperature?
(a) Carbon
(c) Sulphur
(b) Bromine
(d) lodine
[6] The molecular formula of butane is
(a)CH
(c) C, H₂
(6) CH.
(d) C₂ H₂ Cahio
17] The fuel are usually burn with blue flame is
(a) Coal
(c) LPG
(b)Candle wax
(d) Kerosene (in lamp)​

Answer 1

Answer:

(A) CH

3

COONH

4

is salt of Weak acid CH

3

COOH and weak base NH

4

OH. So it is going to be a neutral solution with pH value between 7−7.5

(B) NaCl is salt of strong acid HCl and strong base NaOH. Again it is also neutral with pH value between 7−7.5

(C) NH

4

Cl is salt of strong acid HCl and weak base NH

4

OH. so it is acidic solution with pH less than 7

(D) CH

3

COOK is salt of weak acid

Answer 2

Answer:

14 answer is Bromine

17 answer is Lpg