List of practice Questions

Which one of the following is an essential amino acid?

Which of the following compounds show optical isomerism? (i) $cis-[Co(NH_3)_4Cl_2]^+$ (ii) $trans-[Co(en)_2Cl_2]^+$ (iii) $cis-[Co(en)_2Cl_2]^+$ (iv) $[Co(en)_3]^{3+}$ Choose the correct answer codes given below

A biconvex lens of focal length f forms a circular image of radius r of sun in focal plane. Then which option is correct ?

The velocity $v$ (in $cm / s$ ) of a particle is given in terms of time $t$ (in seconds) by the equation, $v=a t+\frac{b}{t+c}$ The dimensions of $a, b$ and $c$ are :

Match the following:

List-I		List-n (At STP)
(A)	$10 \, g \, CaCO_3 \xrightarrow [\text{decomposition}]{\Delta}$	(i)	$0.224 \, L \, CO_2$
(B)	$1.06 \, g \, Na_2 CO_3 \xrightarrow{\text{Excess HCl}}$	(ii)	$4.48 \, L \, CO_2$
(C)	$2.4 \, g \, C \xrightarrow [\text{combustion}]{Excess \, O_2}$	(iii)	$0.448 \, L \, CO_2$
(D)	$0.56 \, g \, CO \xrightarrow [\text{combustion}]{\text{Excess} O_2}$	(iv)	$2.24 \, L \, CO_2$
		(v)	$22.4 \, L \, CO_2$

The correct match is