Read the following details and decide the correct answer(s) given with each question and then select correct option given below the questions. (i) What is the method to obtain gas in laboratory ? (a) NH_(4)Cl(aq) + NaNO_(2)(g) to Na_(2)(g) + 2H_(2)O(l) + NaCl(aq) (b) 2KClO_(3)(s) overset("Heat")underset([MnO_(2))]to 2KCl(s) + 3O_(2)(g) ( c) 2PbO_(2)(s) overset(Delta)to 2PbO(s) + O_(2)(g) (ii) Which of the following does not have allotropes ? (a) Oxygen (b) Phosphorous (c) Nitrogen (d) Bismuth (iii) XeF_6 reacts with water to produce........... (a) XeO_(3) (b) XeO_(2)F_(2) ( c) XeOF_(4) (d) XeO (iv) Required concentration of 02 to substain of marine and aquatic living beings is............. (a) 3.08 ppm (b) 3.80% w/w (c) 3.80% v/v (d) 3.08% v/v

Read the following details and decide the correct answer(s) given with

1.	Read the following details and decide the correct answer(s) given with each question and then select correct option given below the questions. (i) What is the method to obtain gas in laboratory ? (a) NH_(4)Cl(aq) + NaNO_(2)(g) to Na_(2)(g) + 2H_(2)O(l) + NaCl(aq) (b) 2KClO_(3)(s) overset("Heat")underset([MnO_(2))]to 2KCl(s) + 3O_(2)(g) ( c) 2PbO_(2)(s) overset(Delta)to 2PbO(s) + O_(2)(g) (ii) Which of the following does not have allotropes ? (a) Oxygen (b) Phosphorous (c) Nitrogen (d) Bismuth (iii) XeF_6 reacts with water to produce........... (a) XeO_(3) (b) XeO_(2)F_(2) ( c) XeOF_(4) (d) XeO (iv) Required concentration of 02 to substain of marine and aquatic living beings is............. (a) 3.08 ppm (b) 3.80% w/w (c) 3.80% v/v (d) 3.08% v/v
Answer» (i)a, B (II) rarr d, a (III) rarr b, d, C, a (iv) rarr d (i) rarr a, b (ii) rarr c, a (iii) rarr b, a, c (iv) rarr a (i) rarr a, b (ii) rarr d, c (iii) rarr b, a, c (iv) rarr d (i) rarr a, c (ii) rarr c (iii) rarr a, c(iv) -» c Answer :C