1
JEE Main 2021 (Online) 16th March Morning Shift
Numerical
+4
-1
Complete combustion of 750 g of an organic compound provides 420 g of CO2 and 210 g of H2O. The percentage composition of carbon and hydrogen in organic compound is 15.3 and ___________ respectively. (Round off to the Nearest Integer).
2
JEE Main 2021 (Online) 16th March Morning Shift
Numerical
+4
-1
$$2MnO_4^ - + b{C_2}O_4^{2 - } + c{H^ + } \to xM{n^{2 + }} + yC{O_2} + z{H_2}O$$

If the above equation is balanced with integer coefficients, the value of c is ___________. (Round off to the Nearest Integer).
3
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
The NaNO3 weighed out to make 50 mL of an aqueous solution containing 70.0 mg Na+ per mL is _________ g. (Rounded off to the nearest integer)

[Given : Atomic weight in g mol$$-$$1 - Na : 23; N : 14; O : 16]
4
JEE Main 2021 (Online) 26th February Morning Shift
Numerical
+4
-1
The number of significant figures in 50000.020 $$\times$$ 10$$-$$3 is _____________.
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