1
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
A solution of sodium sulphate contains 92 g of Na+ ions per kilogram of water. The molality of Na+ ions in that solution in mol kg$$-$$1 is :
A
12
B
4
C
8
D
16
2
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
An unknown chlorohydrocarbon has 3.55% of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are :
(Atomic wt. of Cl = 35.5 u; Avogadro constant = 6.023 $$\times$$ 1023 mol-1)
A
6.023 $$\times$$ 1020
B
6.023 $$\times$$ 109
C
6.023 $$\times$$ 1021
D
6.023 $$\times$$ 1023
3
JEE Main 2018 (Offline)
+4
-1
The ratio of mass percent of C and H of an organic compound (CXHYOZ) is 6 : 1. If one molecule of the above compound (CXHYOZ) contains half as much oxygen as required to burn one molecule of compound CXHY completely to CO2 and H2O. The empirical formula of compound CXHYOZ is
A
C2H4O3
B
C3H6O3
C
C2H4O
D
C3H4O2
4
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
For per gram of reactant, the maximum quantity of N2 gas is produced in which of the following thermal decomposition reactions ?
(Given : Atomic wt. - Cr = 52 u, Ba = 137 u)
A
(NH4)2Cr2O7(s) $$\to$$ N2(g) + 4H2O(g) + Cr2O3(s)
B
2NH4NO3(s) $$\to$$ 2 N2(g) + 4H2O(g) + O2(g)
C
Ba(N3)2(s) $$\to$$ Ba(s) + 3N2(g)
D
2NH3(g) $$\to$$ N2(g) + 3H2(g)
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