howToPlease on "Calling widget using shortcode query poblem"

I am calling a widget using shortcode,
everything is wordking except when I passs a widget option as a query then it only accepts title.

Like
[widget name="WP_Widget_Categories"]title=Category&dropdown=1&count=1&hierarchical=1[/widget]

Now when this shortcode output then it shows my title query but no action for other three query. I tried this with all widget, same problem.

Please check if my query format is mistaken.

and here is my shortcode function

add_shortcode('widget','widget');
function ra_widget($atts, $content) {
	// Configure defaults and extract the attributes into variables
	extract( shortcode_atts(
		array(
			'name'  => ''
		),
		$atts
	));

	ob_start();
	the_widget($name, $content, 'before_widget=<div class="post-widget">&after_widget=</div>&before_title=<h3>&after_title=</h3>');
	$output = ob_get_clean();

	return $output;
}